SYSTEME D'ALARME ELECTRONIQUE

ELECTRONIC WARNING SYSTEM

Abrégé anglais

ABSTRACT OF THE DISCLOSURE
Warning apparatus comprising a transmitter for producing a coded
signal and a monitor for detecting such signal; the transmitter
including a detection circuit comprising sensors responsive to
abnormal conditions at a location in a region near the transmitter,
a circuit for generating a coded signal in response to the abnormal
condition detected, and circuit means for transmitting the coded
signal for reception by the monitor; the monitor including circuit
means for receiving the coded signal transmitted, an electronic
circuit for decoding the coded signal received, and an electronic
circuit for displaying the type of abnormal condition detected by the
sensor and the location of the transmitter which detected the abnormal
condition. ..

Revendications

The embodiments of the invention in which an exclusive
property or privileges is claimed are defined as follows:
1. A warning system for sensing conditions at a remote source
comprising a transmitter located in the region of said remote
source for transmitting a coded signal in response to an abnormal
condition sensed at said remote source, said coded signal
comprising information of the abnormal condition sensed and the
location of said transmitter, and a monitor for receiving said
transmitted coded signal and indicating said abnormal condition
sensed and the location of said transmitter; said transmitter
comprising a power supply for said transmitter, sensing means
responsive to an abnormal condition at said remote source, coding
means comprising a silicon controlled rectifier gate array
connected to said power supply and said sensing means for
activating said transmitter when said sensing means detects an
abnormal condition, and comprising means for generating a coded
signal in response to said activation of said transmitter when said
sensing means detects an abnormal condition, and means connected to
said coding means for transmitting said generated coded signal;
said monitor comprising a power supply for said monitor, means for
receiving said transmitted coded signal, means connected to said
detecting means for decoding said signal received, and means
connected to said decoding means for indicating said abnormal
condition sensed by said sensing means of said transmitter and
comprising matrix means for indicating said location of said
transmitter.
42

2. A warning system according to claim 1 wherein said coding
means of said transmitter comprises a parallel to serial converter.
3. A warning system according to claim 2 wherein said parallel
to serial converter of said coding means of said transmitter is a
universal asynchronous receiver/transmitter circuit.
4. A warning system according to claim 1 wherein said coding
means of said transmitter comprises an encoder circuit connected to
said silicon controlled rectifier gate array, a data latch circuit
connected to said encoder circuit, and a parallel to serial
converter connected to said data latch circuit.
5. A warning system according to claim 4 wherein said parallel
to serial converter of said coding means of said transmitter is a
universal asynchronous receiver/transmitter circuit.
6. A warning system according to claims 2, 3, 4, or 5, wherein
said transmitting means of said transmitter comprises a transmit
timing circuit connected to said parallel to serial converter.
7. A warning system according to claims 2, 3, 4, or 5, wherein
said transmitting means of said transmitter comprises a transmit
timing circuit connected to said parallel to serial converter, an
amplification circuit connected to said parallel to serial
converter, and an oscillator circuit connected to said
amplification circuit, and said coded signal generated is
transmitted by said transmitting means of said transmitter as a
radio frequency signal.
8. A warning system according to claims 2, 3, 4, or 5, wherein
said transmitting means of said transmitter comprises a transmit
timing circuit connected to said parallel to serial converter, an
43

inverter circuit connected to said parallel to serial converter, an
amplification circuit connected to said inverter circuit, and an
oscillator circuit connected to said amplification circuit, and
said coded signal generated is transmitted by said transmitting
means of said transmitter as a radio frequency signal.
9. A warning system according to claims 1, 2, 3, 4, or 5, wherein
said coded signal generated comprises a first part identifying the
location of said remote source where said abnormal condition is
sensed, and a second part identifying the type of abnormal
condition sensed.
10. A warning system according to claims 2, 3, 4, or 5, wherein
said coded signal generated comprises a first part identifying the
location of said remote source where said abnormal condition is
sensed, and a second part identifying the type of abnormal
condition sensed, and said coding means of said transmitter
comprises a dip switch assembly connected to said parallel to
serial converter for supplying said first part of said coded signal
identifying the location of said transmitter.
11. A warning system according to claims 2, 3, 4, or 5, wherein
said transmitting means of said transmitter comprises a transmit
timing circuit connected to said parallel to serial converter, an
amplification circuit connected to said parallel to serial
converter, and an oscillator circuit connected to said
amplification circuit, and said coded signal generated comprises a
first part identifying the location of said remote source where
said abnormal condition is sensed, and a second part identifying
the type of abnormal condition sensed, and said coded signal
44

generated is transmitted by said transmitting means of said
transmitter as a radio frequency signal.
12. A warning system according to claims 2, 3, 4, or 5, wherein
said coded signal generated comprises a first part identifying the
location of said remote source where said abnormal condition is
sensed, and a second part identifying the type of abnormal
condition sensed, and said coding means of said transmitter
comprises a dip switch assembly connected to said parallel to
serial converter for supplying said first part of said coded signal
identifying the location of said transmitter, and said transmitting
means of said transmitter comprises a transmit timing circuit
connected to said parallel to serial converter, an amplification
circuit connected to said parallel to serial converter, and an
oscillator circuit connected to said amplification circuit, and
said coded signal generated is transmitted by said transmitting
means of said transmitter as a radio frequency signal.
13. A warning system according to claims 2, 3, 4, or 5, wherein
said transmitting means of said transmitter comprises a transmit
timing circuit connected to said parallel to serial converter, an
inverter circuit connected to said parallel to serial converter, an
amplification circuit connected to said inverter circuit, and an
oscillator circuit connected to said amplification circuit, and
said coded signal generated comprises a first part identifying the
location of said remote source where said abnormal condition is
sensed, and a second part identifying the type of abnormal
condition sensed, and said coded signal generated is transmitted by

said transmitting means of said transmitter as a radio frequency
signal.
14. A warning system according to claims 2, 3, 4, or 5, wherein
said coded signal generated comprises a first part identifying the
location of said remote source where said abnormal condition is
sensed, and a second part identifying the type of abnormal
condition sensed, and said coding means of said transmitter
comprises a dip switch assembly connected to said parallel to
serial converter for supplying said first part of said coded signal
identifying the location of said transmitter, and said transmitting
means of such transmitter comprises a transmit timing circuit
connected to said parallel to serial converter, an inverter circuit
connected to said parallel to serial converter, an amplification
circuit connected to said inverter circuit, and an oscillator
circuit connected to said amplification circuit, and said coded
signal generated is transmitted by said transmitting means of said
transmitter as a radio frequency signal.
15. A warning system according to claims 2, 3, 4, or 5, wherein
said decoding means of said monitor comprises a serial to parallel
converter.
16. A warning system according to claims 2, 3, 4, or 5, wherein
said decoding means of said monitor comprises a universal
asynchronous receiver/transmitter circuit as a serial to parallel
converter.
17. A warning system according to claims 2, 3, 4, or 5, wherein
said transmitting means of said transmitter comprises a transmit
timing circuit connected to said parallel to serial converter, and
46

said decoding means of said monitor comprises a serial to parallel
converter.
18. A warning system according to claims 2, 3, 4, or 5, wherein
said transmitting means of said transmitter comprises a transmit
timing circuit connected to said parallel to serial converter, an
amplification circuit connected to said parallel to serial
converter, and an oscillator circuit connected to said
amplification circuit, and said coded signal generated is
transmitted by said transmitting means of said transmitter as a
radio frequency signal, and said decoding means of said monitor
comprises a serial to parallel converter.
19. A warning system according to claims 2, 3, 4, or 5, wherein
said transmitting means of said transmitter comprises a transmit
timing circuit connected to said parallel to serial converter, an
inverter circuit connected to said parallel to serial converter, an
amplification circuit connected to said inverter circuit, and an
oscillator circuit connected to said amplification circuit, and
said coded signal generated is transmitted by said transmitting
means of said transmitter as a radio frequency signal, and said
decoding means of said monitor comprises a serial to parallel
converter.
20. A warning system according to claims 1, 2, 3, 4, or 5, wherein
said coded signal generated comprises a first part identifying the
location of said remote source where said abnormal condition is
sensed, and a second part identifying the type of abnormal
condition sensed, and said decoding means of said monitor comprises
a serial to parallel converter.
47

21. A warning system according to claims 2, 3, 4, or 5, wherein
said coded signal generated comprises a first part identifying the
location of said remote source where said abnormal condition is
sensed, and a second part identifying the type of abnormal
condition sensed, and said coding means of said transmitter
comprises a dip switch assembly connected to said parallel to
serial converter for supplying said first part of said coded signal
identifying the location of said transmitter, and said decoding
means of said monitor comprises a serial to parallel converter.
22. A warning system according to claims 2, 3, 4, or 5, wherein
said transmitting means of said transmitter comprises a transmit
timing circuit connected to said parallel to serial converter, an
amplification circuit connected to said parallel to serial
converter, and an oscillator circuit connected to said
amplification circuit, and said coded signal generated comprises a
first part identifying the location of said remote source where
said abnormal condition is sensed, and a second part identifying
the type of abnormal condition sensed, and said coded signal
generated is transmitted by said transmitting means of said
transmitter as a radio frequency signal, and said decoding means of
said monitor comprises a serial to parallel converter.
23. A warning system according to claims 2, 3, 4, or 5, wherein
said coded signal generated comprises a first part identifying the
location of said remote source where said abnormal condition is
sensed, and a second part identifying the type of abnormal
condition sensed, and said coding means of said transmitter
comprises a dip switch assembly connected to said parallel to
48

serial converter for supplying said first part of said coded signal
identifying the location of said transmitter, and said transmitting
means of said transmitter comprises a transmit timing circuit
connected to said parallel to serial converter, an amplification
circuit connected to said parallel to serial converter, and an
oscillator circuit connected to said amplification circuit, and
said coded signal generated is transmitted by said transmitting
means of said transmitter as a radio frequency signal, and said
decoding means of said monitor comprises a serial to parallel
converter.
24. A warning system according to claims 2, 3, 4, or 5, wherein
said transmitting means of said transmitter comprises a transmit
timing circuit connected to said parallel to serial converter, an
inverter circuit connected to said parallel to serial converter, an
amplification circuit connected to said inverter circuit, and an
oscillator circuit connected to said amplification circuit, and
said coded signal generated comprises a first part identifying the
location of said remote source where said abnormal condition is
sensed, and a second part identifying the type of abnormal
condition sensed, and said coded signal generated is transmitted by
said transmitting means of said transmitter as a radio frequency
signal, and said decoding means of said monitor comprises a serial
to parallel converter.
25. A warning system according to claims 2, 3, 4, or 5, wherein
said coded signal generated comprises a first part identifying the
location of said remote source where said abnormal condition is
sensed, and a second part identifying the type of abnormal
49

condition sensed, and said coding means of said transmitter
comprises a dip switch assembly connected to said parallel to
serial converter for supplying said first part of said coded signal
identifying the location of said transmitter, and said transmitting
means of such transmitter comprises a transmit timing circuit
connected to said parallel to serial converter, an inverter circuit
connected to said parallel to serial converter, an amplification
circuit connected to said inverter circuit, and an oscillator
circuit connected to said amplification circuit, and said coded
signal generated is transmitted by said transmitting means of said
transmitter as a radio frequency signal, and said decoding means of
said monitor comprises a serial to parallel converter.
26. A warning system according to claims 2, 3, 4, or 5, wherein
said transmitting means of said transmitter comprises a transmit
timing circuit connected to said parallel to serial converter, and
said decoding means of said monitor comprises a universal
asynchronous receiver/transmitter circuit as a serial to parallel
converter.
27. A warning system according to claims 2, 3, 4, or 5, wherein
said transmitting means of said transmitter comprises a transmit
timing circuit connected to said parallel to serial converter, an
amplification circuit connected to said parallel to serial
converter, and an oscillator circuit connected to said
amplification circuit, and said coded signal generated is
transmitted by said transmitting means of said transmitter as a
radio frequency signal, and said decoding means of said monitor

comprises a universal asynchronous receiver/transmitter circuit as
a serial to parallel converter.
28. A warning system according to claims 2, 3, 4, or 5, wherein
said transmitting means of said transmitter comprises a transmit
timing circuit connected to said parallel to serial converter, an
inverter circuit connected to said parallel to serial converter, an
amplification circuit connected to said inverter circuit, and an
oscillator circuit connected to said amplification circuit, and
said coded signal generated is transmitted by said transmitting
means of said transmitter as a radio frequency signal, and said
decoding means of said monitor comprises a universal asynchronous
receiver/transmitter circuit as a serial to parallel converter.
29. A warning system according to claims 1, 2, 3, 4, or 5, wherein
said coded signal generated comprises a first part identifying the
location of said remote source where said abnormal condition is
sensed, and a second part identifying the type of abnormal
condition sensed, and said decoding means of said monitor comprises
a universal asynchronous receiver/transmitter circuit as a serial
to parallel converter.
30. A warning system according to claims 2, 3, 4, or 5, wherein
said coded signal generated comprises a first part identifying the
location of said remote source where said abnormal condition is
sensed, and a second part identifying the type of abnormal
condition sensed, and said coding means of said transmitter
comprises a dip switch assembly connected to said parallel to
serial converter for supplying said first part of said coded signal
identifying the location of said transmitter, and said decoding
51

means of said monitor comprises a universal asynchronous
receiver/transmitter circuit as a serial to parallel converter.
31. A warning system according to claims 2, 3, 4, or 5, wherein
said transmitting means of said transmitter comprises a transmit
timing circuit connected to said parallel to serial converter, an
amplification circuit connected to said parallel to serial
converter, and an oscillator circuit connected to said
amplification circuit, and said coded signal generated comprises a
first part identifying the location of said remote source where
said abnormal condition is sensed, and a second part identifying
the type of abnormal condition sensed, and said coded signal
generated is transmitted by said transmitting means of said
transmitter as a radio frequency signal, and said decoding means of
said monitor comprises a universal asynchronous
receiver/transmitter circuit as a serial to parallel converter.
32. A warning system according to claims 2, 3, 4, or 5, wherein
said coded signal generated comprises a first part identifying the
location of said remote source where said abnormal condition is
sensed, and a second part identifying the tape of abnormal
condition sensed, and said coding means of said transmitter
comprises a dip switch assembly connected to said parallel to
serial converter for supplying said first part of said coded signal
identifying the location of said transmitter, and said transmitting
means of said transmitter comprises a transmit timing circuit
connected to said parallel to serial converter, an amplification
circuit connected to said parallel to serial converter, and an
oscillator circuit connected to said amplification circuit, and
52

said coded signal generated is transmitted by said transmitting
means of said transmitter as a radio frequency signal, and said
decoding means of said monitor comprises a universal asynchronous
receiver/transmitter circuit as a serial to parallel converter.
33. A warning system according to claims 2, 3, 4, or 5, wherein
said transmitting means of said transmitter comprises a transmit
timing circuit connected to said parallel to serial converter, an
inverter circuit connected to said parallel to serial converter, an
amplification circuit connected to said inverter circuit, and an
oscillator circuit connected to said amplification circuit, and
said coded signal generated comprises a first part identifying the
location of said remote source where said abnormal condition is
sensed, and a second part identifying the type of abnormal
condition sensed, and said coded signal generated is transmitted by
said transmitting means of said transmitter as a radio frequency
signal, and said decoding means of said monitor comprises a
universal asynchronous receiver/transmitter circuit as a serial to
parallel converter.
34. A warning system according to claims 2, 3, 4, or 5, wherein
said coded signal generated comprises a first part identifying the
location of said remote source where said abnormal condition is
sensed, and a second part identifying the type of abnormal
condition sensed, and said coding means of said transmitter
comprises a dip switch assembly connected to said parallel to
serial converter for supplying said first part of said coded signal
identifying the location of said transmitter, and said transmitting
means of such transmitter comprises a transmit timing circuit
53

connected to said parallel to serial converter, an inverter circuit
connected to said parallel to serial converter, an amplification
circuit connected to said inverter circuit, and an oscillator
circuit connected to said amplification circuit, and said coded
signal generated is transmitted by said transmitting means of said
transmitter as a radio frequency signal, and said decoding means of
said monitor comprises a universal asynchronous
receiver/transmitter circuit as a serial to parallel converter.
35. A warning system according to claims 2, 3, 4, or 5, wherein
said transmitting means of said transmitter comprises a transmit
timing circuit connected to said parallel to serial converter, an
amplification circuit connected to said parallel to serial
converter, and an oscillator circuit connected to said
amplification circuit, and said coded signal generated is
transmitted by said transmitting means of said transmitter as a
radio frequency signal, and said means for receiving said
transmitted coded signal from said transmitter of said monitor
comprises an antenna, a tuned circuit connected to said antenna,
and amplification circuits connected to said tuned circuit.
36. A warning system according to claims 2, 3, 4, or 5, wherein
said transmitting means of said transmitter comprises a transmit
timing circuit connected to said parallel to serial converter, an
amplification circuit connected to said parallel to serial
converter, and an oscillator circuit connected to said
amplification circuit, and said coded signal generated comprises a
first part identifying the location of said remote source where
said abnormal condition is sensed, and a second part identifying
54

the type of abnormal condition sensed, and said coded signal
generated is transmitted by said transmitting means of said
transmitter as a radio frequency signal, and said means for
receiving said transmitted coded signal from said transmitter of
said monitor comprises an antenna, a tuned circuit connected to
said antenna, and amplification circuits connected to said tuned
circuit.
37. A warning system according to claims 2, 3, 4, or 5, wherein
said coded signal generated comprises a first part identifying the
location of said remote source where said abnormal condition is
sensed, and a second part identifying the type of abnormal
condition sensed, and said coding means of said transmitter
comprises a dip switch assembly connected to said parallel to
serial converter for supplying said first part of said coded signal
identifying the location of said transmitter, and said transmitting
means of said transmitter comprises a transmit timing circuit
connected to said parallel to serial converter, an amplification
circuit connected to said parallel to serial converter, and an
oscillator circuit connected to said amplification circuit, and
said coded signal generated is transmitted by said transmitting
means of said transmitter as a radio frequency signal, and said
means for receiving said transmitted coded signal from said
transmitter of said monitor comprises an antenna, a tuned circuit
connected to said antenna, and amplification circuits connected to
said tuned circuit.
38. A warning system according to claims 2, 3, 4, or 5, wherein
said transmitting means of said transmitter comprises a transmit

timing circuit connected to said parallel to serial converter, an
amplification circuit connected to said parallel to serial
converter, and an oscillator circuit connected to said
amplification circuit, and said coded signal generated is
transmitted by said transmitting means of said transmitter as a
radio frequency signal, and said means for receiving said
transmitted coded signal from said transmitter of said monitor
comprises an antenna, a tuned circuit connected to said antenna,
and amplification circuits connected to said tuned circuit, and
said decoding means of said monitor comprises a serial to parallel
converter connected to said amplification circuits of said
receiving means of said monitor.
39. A warning system according to claims 2, 3, 4, or 5, wherein
said transmitting means of said transmitter comprises a transmit
timing circuit connected to said parallel to serial converter, an
amplification circuit connected to said parallel to serial
converter, and an oscillator circuit connected to said
amplification circuit, and said coded signal generated comprises a
first part identifying the location of said remote source where
said abnormal condition is sensed, and a second part identifying
the type of abnormal condition sensed, and said coded signal
generated is transmitted by said transmitting means of said
transmitter as a radio frequency signal, and said means for
receiving said transmitted coded signal from said transmitter of
said monitor comprises an antenna, a tuned circuit connected to
said antenna, and amplification circuits connected to said tuned
circuit, and said decoding means of said monitor comprises a serial
56

to parallel converter connected to said amplification circuits of
said receiving means of said monitor.
40. A warning system according to claims 2, 3, 4, or 5, wherein
said coded signal generated comprises a first part identifying the
location of said remote source where said abnormal condition is
sensed, and a second part identifying the type of abnormal
condition sensed, and said coding means of said transmitter
comprises a dip switch assembly connected to said parallel to
serial converter for supplying said first part of said coded signal
identifying the location of said transmitter, and said transmitting
means of said transmitter comprises a transmit timing circuit
connected to said parallel to serial converter, an amplification
circuit connected to said parallel to serial converter, and an
oscillator circuit connected to said amplification circuit, and
said coded signal generated is transmitted by said transmitting
means of said transmitter as a radio frequency signal, and said
means for receiving said transmitted coded signal from said
transmitter of said monitor comprises an antenna, a tuned circuit
connected to said antenna, and amplification circuits connected to
said tuned circuit, and said decoding means of said monitor
comprises a serial to parallel converter connected to said
amplification circuits of said receiving means of said monitor.
41. A warning system according to claims 2, 3, 4, or 5, wherein
said transmitting means of said transmitter comprises a transmit
timing circuit connected to said parallel to serial converter, an
amplification circuit connected to said parallel to serial
converter, and an oscillator circuit connected to said
57

amplification circuit, and said coded signal generated is
transmitted by said transmitting means of said transmitter as a
radio frequency signal, and said means for receiving said
transmitted coded signal from said transmitter of said monitor
comprises an antenna, a tuned circuit connected to said antenna,
and amplification circuits connected to said tuned circuit, and
said decoding means of said monitor comprises a universal
asynchronous receiver/transmitter circuit as a serial to parallel
converter connected to said amplification circuits of said
receiving means of said monitor.
42. A warning system according to claims 2, 3, 4, or 5, wherein
said transmitting means of said transmitter comprises a transmit
timing circuit connected to said parallel to serial converter, an
amplification circuit connected to said parallel to serial
converter, and an oscillator circuit connected to said
amplification circuit, and said coded signal generated comprises a
first part identifying the location of said remote source where
said abnormal condition is sensed, and a second part identifying
the type of abnormal condition sensed, and said coded signal
generated is transmitted by said transmitting means of said
transmitter as a radio frequency signal, and said means for
receiving said transmitted coded signal from said transmitter of
said monitor comprises an antenna, a tuned circuit connected to
said antenna, and amplification circuits connected to said tuned
circuit, and said decoding means of said monitor comprises a
universal asynchronous receiver/transmitter circuit as a serial to
58

parallel converter connected to said amplification circuits of said
receiving means of said monitor.
43. A warning system according to claims 2, 3, 4, or 5, wherein
said coded signal generated comprises a first part identifying the
location of said remote source where said abnormal condition is
sensed, and a second part identifying the type of abnormal
condition sensed, and said coding means of said transmitter
comprises a dip switch assembly connected to said parallel to
serial converter for supplying said first part of said coded signal
identifying the location of said transmitter, and said transmitting
means of said transmitter comprises a transmit timing circuit
connected to said parallel to serial converter, an amplification
circuit connected to said parallel to serial converter, and an
oscillator circuit connected to said amplification circuit, and
said coded signal generated is transmitted by said transmitting
means of said transmitter as a radio frequency signal, and said
means for receiving said transmitted coded signal from said
transmitter of said monitor comprises an antenna, a tuned circuit
connected to said antenna, and amplification circuits connected to
said tuned circuit, and said decoding means of said monitor
comprises a universal asynchronous receiver/transmitter circuit as
a serial to parallel converter connected to said amplification
circuits of said receiving means of said monitor.
44. A warning system according to claims 2, 3, 4, or 5, wherein
said transmitting means of said transmitter comprises a transmit
timing circuit connected to said parallel to serial converter, an
inverter circuit connected to said parallel to serial converter, an
59

amplification circuit connected to said inverter circuit, and an
oscillator circuit connected to said amplification circuit, and
said coded signal generated is transmitted by said transmitting
means of said transmitter as a radio frequency signal, and said
means for receiving said transmitted coded signal from said
transmitter of said monitor comprises an antenna, a tuned circuit
connected to said antenna, amplification circuits connected to said
tuned circuit, and an inverter circuit connected to said
amplification circuits.
45. A warning system according to claims 2, 3, 4, or 5, wherein
said transmitting means of said transmitter comprises a transmit
timing circuit connected to said parallel to serial converter, an
inverter circuit connected to said parallel to serial converter, an
amplification circuit connected to said inverter circuit, and an
oscillator circuit connected to said amplification circuit, and
said coded signal generated comprises a first part identifying the
location of said remote source where said abnormal condition is
sensed, and a second part identifying the type of abnormal
condition sensed, and said coded signal generated is transmitted by
said transmitting means of said transmitter as a radio frequency
signal, and said means for receiving said transmitted coded signal
from said transmitter of said monitor comprises an antenna, a tuned
circuit connected to said antenna, amplification circuits connected
to said tuned circuit, and an inverter circuit connected to said
amplification circuits.
46. A warning system according to claims 2, 3, 4, or 5, wherein
said coded signal generated comprises a first part identifying the

location of said remote source where said abnormal condition is
sensed, and a second part identifying the type of abnormal
condition sensed, and said coding means of said transmitter
comprises a dip switch assembly connected to said parallel to
serial converter for supplying said first part of said coded signal
identifying the location of said transmitter, and said transmitting
means of such transmitter comprises a transmit timing circuit
connected to said parallel to serial converter, an inverter circuit
connected to said parallel to serial converter, an amplification
circuit connected to said inverter circuit, and an oscillator
circuit connected to said amplification circuit, and said coded
signal generated is transmitted by said transmitting means of said
transmitter as a radio frequency signal, and said means for
receiving said transmitted coded signal from said transmitter of
said monitor comprises an antenna, a tuned circuit connected to
said antenna, amplification circuits connected to said tuned
circuit, and an inverter circuit connected to said amplification
circuits.
47. A warning system according to claims 2, 3, 4, or 5, wherein
said transmitting means of said transmitter comprises a transmit
timing circuit connected to said parallel to serial converter, an
inverter circuit connected to said parallel to serial converter, an
amplification circuit connected to said inverter circuit, and an
oscillator circuit connected to said amplification circuit, and
said coded signal generated is transmitted by said transmitting
means of said transmitter as a radio frequency signal, and said
means for receiving said transmitted coded signal from said
61

transmitter of said monitor comprises an antenna, a tuned circuit
connected to said antenna, amplification circuits connected to said
tuned circuit, and an inverter circuit connected to said
amplification circuits, and said decoding means of said monitor
comprises a serial to parallel converter connected to said inverter
circuit of said receiving means of said monitor.
48. A warning system according to claims 2, 3, 4, or 5, wherein
said transmitting means of said transmitter comprises a transmit
timing circuit connected to said parallel to serial converter, an
inverter circuit connected to said parallel to serial converter, an
amplification circuit connected to said inverter circuit, and an
oscillator circuit connected to said amplification circuit, and
said coded signal generated comprises a first part identifying the
location of said remote source where said abnormal condition is
sensed, and a second part identifying the type of abnormal
condition sensed, and said coded signal generated is transmitted by
said transmitting means of said transmitter as a radio frequency
signal, and said means for receiving said transmitted coded signal
from said transmitter of said monitor comprises an antenna, a tuned
circuit connected to said antenna, amplification circuits connected
to said tuned circuit, and an inverter circuit connected to said
amplification circuits, and said decoding means of said monitor
comprises a serial to parallel converter connected to said inverter
circuit of said receiving means of said monitor.
49. A warning system according to claims 2, 3, 4, or 5, wherein
said coded signal generated comprises a first part identifying the
location of said remote source where said abnormal condition is
62

sensed, and a second part identifying the type of abnormal
condition sensed, and said coding means of said transmitter
comprises a dip switch assembly connected to said parallel to
serial converter for supplying said first part of said coded signal
identifying the location of said transmitter, and said transmitting
means of such transmitter comprises a transmit timing circuit
connected to said parallel to serial converter, an inverter circuit
connected to said parallel to serial converter, an amplification
circuit connected to said inverter circuit, and an oscillator
circuit connected to said amplification circuit, and said coded
signal generated is transmitted by said transmitting means of said
transmitter as a radio frequency signal, and said means for
receiving said transmitted coded signal from said transmitter of
said monitor comprises an antenna, a tuned circuit connected to
said antenna, amplification circuits connected to said tuned
circuit, and an inverter circuit connected to said amplification
circuits, and said decoding means of said monitor comprises a
serial to parallel converter connected to said inverter circuit of
said receiving means of said monitor.
50. A warning system according to claims 2, 3, 4, or 5, wherein
said transmitting means of said transmitter comprises a transmit
timing circuit connected to said parallel to serial converter, an
inverter circuit connected to said parallel to serial converter, an
amplification circuit connected to said inverter circuit, and an
oscillator circuit connected to said amplification circuit, and
said coded signal generated is transmitted by said transmitting
means of said transmitter as a radio frequency signal, and said
63

means for receiving said transmitted coded signal from said
transmitter of said monitor comprises an antenna, a tuned circuit
connected to said antenna, amplification circuits connected to said
tuned circuit, and an inverter circuit connected to said
amplification circuits, and said decoding means of said monitor
comprises a universal asynchronous receiver/transmitter circuit as
a serial to parallel converter connected to said inverter circuit
of said receiving means of said monitor.
51. A warning system according to claims 2, 3, 4, or 5, wherein
said transmitting means of said transmitter comprises a transmit
timing circuit connected to said parallel to serial converter, an
inverter circuit connected to said parallel to serial converter, an
amplification circuit connected to said inverter circuit, and an
oscillator circuit connected to said amplification circuit, and
said coded signal generated comprises a first part identifying the
location of said remote source where said abnormal condition is
sensed, and a second part identifying the type of abnormal
condition sensed, and said coded signal generated is transmitted by
said transmitting means of said transmitter as a radio frequency
signal, and said means for receiving said transmitted coded signal
from said transmitter of said monitor comprises an antenna, a tuned
circuit connected to said antenna, amplification circuits connected
to said tuned circuit, and an inverter circuit connected to said
amplification circuits, and said decoding means of said monitor
comprises a universal asynchronous receiver/transmitter circuit as
a serial to parallel converter connected to said inverter circuit
of said receiving means of said monitor.
64

52. A warning system according to claims 2, 3, 4, or 5, wherein
said coded signal generated comprises a first part identifying the
location of said remote source where said abnormal condition is
sensed, and a second part identifying the type of abnormal
condition sensed, and said coding means of said transmitter
comprises a dip switch assembly connected to said parallel to
serial converter for supplying said first part of said coded signal
identifying the location of said transmitter, and said transmitting
means of such transmitter comprises a transmit timing circuit
connected to said parallel to serial converter, an inverter circuit
connected to said parallel to serial converter, an amplification
circuit connected to said inverter circuit, and an oscillator
circuit connected to said amplification circuit, and said coded
signal generated is transmitted by said transmitting means of said
transmitter as a radio frequency signal, and said means for
receiving said transmitted coded signal from said transmitter of
said monitor comprises an antenna, a tuned circuit connected to
said antenna, amplification circuits connected to said tuned
circuit, and an inverter circuit connected to said amplification
circuits, and said decoding means of said monitor comprises a
universal asynchronous receiver/transmitter circuit as a serial to
parallel converter connected to said inverter circuit of said
receiving means of said monitor.
53. A warning system according to claims 2, 3, 4, or 5, wherein
said decoding means of said monitor comprises a serial to parallel
converter, and said means for indicating said abnormal condition
sensed of said monitor comprises electronic circuit means

including, an audio warning circuit connected to said serial to
parallel converter, a decoder circuit connected to said serial to
parallel converter, and a visual display circuit connected to said
decoder circuit.
54. A warning system according to claims 2, 3, 4, or 5, wherein
said decoding means of said monitor comprises a serial to parallel
converter, and said means for indicating said abnormal condition
sensed of said monitor comprises electronic circuit means including
an audio warning circuit connected to said serial to parallel
converter, a decoder circuit connected to said serial to parallel
converter, and a visual display circuit connected to said decoder
circuit, and said matrix means of said monitor for indicating the
location of said transmitter includes said visual display circuit
in the form of an L.E.D. matrix.
55. A warning system according to claims 2, 3, 4, or 5, wherein
said decoding means of said monitor comprises a universal
asynchronous receiver/transmitter circuit as a serial to parallel
converter, and said means for indicating said abnormal condition
sensed of said monitor comprises electronic circuit means
including, an audio warning circuit connected to said serial to
parallel converter, a decoder circuit connected to said serial to
parallel converter, and a visual display circuit connected to said
decoder circuit.
56. A warning system according to claims 2, 3, 4, or 5, wherein
said decoding means of said monitor comprises a universal
asynchronous receiver/transmitter circuit as a serial to parallel
converter, and said means for indicating said abnormal condition
66

sensed of said monitor comprises electronic circuit means including
an audio warning circuit connected to said serial to parallel
converter, a decoder circuit connected to said serial to parallel
converter, and a visual display circuit connected to said decoder
circuit, and said matrix means of said monitor for indicating the
location of said transmitter includes said visual display circuit
in the form of an L.E.D. matrix.
57. A warning system according to claims 2, 3, 4, or 5, wherein
said transmitting means of said transmitter comprises a transmit
timing circuit connected to said parallel to serial converter, an
amplification circuit connected to said parallel to serial
converter, and an oscillator circuit connected to said
amplification circuit, and said coded signal generated is
transmitted by said transmitting means of said transmitter as a
radio frequency signal, and said means for receiving said
transmitted coded signal from said transmitter of said monitor
comprises an antenna, a tuned circuit connected to said antenna,
and amplification circuits connected to said tuned circuit, and
said decoding means of said monitor comprises a serial to parallel
converter connected to said amplification circuits of said
receiving means of said monitor, and said means for indicating said
abnormal condition sensed of said monitor comprises electronic
circuit means including, an audio warning circuit connected to said
serial to parallel converter, a decoder circuit connected to said
serial to parallel converter, and a visual display circuit
connected to said decoder circuit.
67

58. A warning system according to claims 2, 3, 4, or 5, wherein
said transmitting means of said transmitter comprises a transmit
timing circuit connected to said parallel to serial converter, an
amplification circuit connected to said parallel to serial
converter, and an oscillator circuit connected to said
amplification circuit, and said coded signal generated is
transmitted by said transmitting means of said transmitter as a
radio frequency signal, and said means for receiving said
transmitted coded signal from said transmitter of said monitor
comprises an antenna, a tuned circuit connected to said antenna,
and amplification circuits connected to said tuned circuit, and
said decoding means of said monitor comprises a serial to parallel
converter connected to said amplification circuits of said
receiving means of said monitor, and said means for indicating said
abnormal condition sensed of said monitor comprises electronic
circuit means including an audio warning circuit connected to said
serial to parallel converter, a decoder circuit connected to said
serial to parallel converter, and a visual display circuit
connected to said decoder circuit, and said matrix means of said
monitor for indicating the location of said transmitter includes
said visual display circuit in the form of an L.E.D. matrix.
59. A warning system according to claims 2, 3, 4, or 5, wherein
said transmitting means of said transmitter comprises a transmit
timing circuit connected to said parallel to serial converter, an
amplification circuit connected to said parallel to serial
converter, and an oscillator circuit connected to said
amplification circuit, and said coded signal generated comprises a
68

first part identifying the location of said remote source where
said abnormal condition is sensed, and a second part identifying
the type of abnormal condition sensed, and said coded signal
generated is transmitted by said transmitting means of said
transmitter as a radio frequency signal, and said means for
receiving said transmitted coded signal from said transmitter of
said monitor comprises an antenna, a tuned circuit connected to
said antenna, and amplification circuits connected to said tuned
circuit, and said decoding means of said monitor comprises a serial
to parallel converter connected to said amplification circuits of
said receiving means of said monitor, and said means for indicating
said abnormal condition sensed of said monitor comprises electronic
circuit means including, an audio warning circuit connected to said
serial to parallel converter, a decoder circuit connected to said
serial to parallel converter, and a visual display circuit
connected to said decoder circuit.
60. A warning system according to claims 2, 3, 4, or 5, wherein
said transmitting means of said transmitter comprises a transmit
timing circuit connected to said parallel to serial converter, an
amplification circuit connected to said parallel to serial
converter, and an oscillator circuit connected to said
amplification circuit, and said coded signal generated comprises a
first part identifying the location of said remote source where
said abnormal condition is sensed, and a second part identifying
the type of abnormal condition sensed, and said coded signal
generated is transmitted by said transmitting means of said
transmitter as a radio frequency signal, and said means for
69

receiving said transmitted coded signal from said transmitter of
said monitor comprises an antenna, a tuned circuit connected to
said antenna, and amplification circuits connected to said tuned
circuit, and said decoding means of said monitor comprises a serial
to parallel converter connected to said amplification circuits of
said receiving means of said monitor, and said means for indicating
said abnormal condition sensed of said monitor comprises electronic
circuit means including an audio warning circuit connected to said
serial to parallel converter, a decoder circuit connected to said
serial to parallel converter, and a visual display circuit
connected to said decoder circuit, and said matrix means of said
monitor for indicating the location of said transmitter includes
said visual display circuit in the form of an L.E.D. matrix.
61. A warning system according to claims 2, 3, 4, or 5, wherein
said coded signal generated comprises a first part identifying the
location of said remote source where said abnormal condition is
sensed, and a second part identifying the type of abnormal
condition sensed, and said coding means of said transmitter
comprises a dip switch assembly connected to said parallel to
serial converter for supplying said first part of said coded signal
identifying the location of said transmitter, and said transmitting
means of said transmitter comprises a transmit timing circuit
connected to said parallel to serial converter, an amplification
circuit connected to said parallel to serial converter, and an
oscillator circuit connected to said amplification circuit, and
said coded signal generated is transmitted by said transmitting
means of said transmitter as a radio frequency signal, and said

means for receiving said transmitted coded signal from said
transmitter of said monitor comprises an antenna, a tuned circuit
connected to said antenna, and amplification circuits connected to
said tuned circuit, and said decoding means of said monitor
comprises a serial to parallel converter connected to said
amplification circuits of said receiving means of said monitor, and
said means for indicating said abnormal condition sensed of said
monitor comprises electronic circuit means including, an audio
warning circuit connected to said serial to parallel converter, a
decoder circuit connected to said serial to parallel converter, and
a visual display circuit connected to said decoder circuit.
62. A warning system according to claims 2, 3, 4, or 5, wherein
said coded signal generated comprises a first part identifying the
location of said remote source where said abnormal condition is
sensed, and a second part identifying the type of abnormal
condition sensed, and said coding means of said transmitter
comprises a dip switch assembly connected to said parallel to
serial converter for supplying said first part of said coded signal
identifying the location of said transmitter, and said transmitting
means of said transmitter comprises a transmit timing circuit
connected to said parallel to serial converter, an amplification
circuit connected to said parallel to serial converter, and an
oscillator circuit connected to said amplification circuit, and
said coded signal generated is transmitted by said transmitting
means of said transmitter as a radio frequency signal, and said
means for receiving said transmitted coded signal from said
transmitter of said monitor comprises an antenna, a tuned circuit
71

connected to said antenna, and amplification circuits connected to
said tuned circuit, and said decoding means of said monitor
comprises a serial to parallel converter connected to said
amplification circuits of said receiving means of said monitor, and
said means for indicating said abnormal condition sensed of said
monitor comprises electronic circuit means including an audio
warning circuit connected to said serial to parallel converter, a
decoder circuit connected to said serial to parallel converter, and
a visual display circuit connected to said decoder circuit, and
said matrix means of said monitor for indicating the location of
said transmitter includes said visual display circuit in the form
of an L.E.D. matrix.
63. A warning system according to claims 2, 3, 4, or 5, wherein
said transmitting means of said transmitter comprises a transmit
timing circuit connected to said parallel to serial converter, an
amplification circuit connected to said parallel to serial
converter, and an oscillator circuit connected to said
amplification circuit, and said coded signal generated is
transmitted by said transmitting means of said transmitter as a
radio frequency signal, and said means for receiving said
transmitted coded signal from said transmitter of said monitor
comprises an antenna, a tuned circuit connected to said antenna,
and amplification circuits connected to said tuned circuit, and
said decoding means of said monitor comprises a universal
asynchronous receiver/transmitter circuit as a serial to parallel
converter connected to said amplification circuits of said
receiving means of said monitor, and said means for indicating said
72

abnormal condition sensed of said monitor comprises electronic
circuit means including, an audio warning circuit connected to said
serial to parallel converter, a decoder circuit connected to said
serial to parallel converter, and a visual display circuit
connected to said decoder circuit.
64. A warning system according to claims 2, 3, 4, or 5, wherein
said transmitting means of said transmitter comprises a transmit
timing circuit connected to said parallel to serial converter, an
amplification circuit connected to said parallel to serial
converter, and an oscillator circuit connected to said
amplification circuit, and said coded signal generated is
transmitted by said transmitting means of said transmitter as a
radio frequency signal, and said means for receiving said
transmitted coded signal from said transmitter of said monitor
comprises an antenna, a tuned circuit connected to said antenna,
and amplification circuits connected to said tuned circuit, and
said decoding means of said monitor comprises a universal
asynchronous receiver/transmitter circuit as a serial to parallel
converter connected to said amplification circuits of said
receiving means of said monitor, and said means for indicating said
abnormal condition sensed of said monitor comprises electronic
circuit means including an audio warning circuit connected to said
serial to parallel converter, a decoder circuit connected to said
serial to parallel converter, and a visual display circuit
connected to said decoder circuit, and said matrix means of said
monitor for indicating the location of said transmitter includes
said visual display circuit in the form of an L.E.D. matrix.
73

65. A warning system according to claims 2, 3, 4, or 5, wherein
said transmitting means of said transmitter comprises a transmit
timing circuit connected to said parallel to serial converter, an
amplification circuit connected to said parallel to serial
converter, and an oscillator circuit connected to said
amplification circuit, and said coded signal generated comprises a
first part identifying the location of said remote source where
said abnormal condition is sensed, and a second part identifying
the type of abnormal condition sensed, and said coded signal
generated is transmitted by said transmitting means of said
transmitter as a radio frequency signal, and said means for
receiving said transmitted coded signal from said transmitter of
said monitor comprises an antenna, a tuned circuit connected to
said antenna, and amplification circuits connected to said tuned
circuit, and said decoding means of said monitor comprises a
universal asynchronous receiver/transmitter circuit as a serial to
parallel converter connected to said amplification circuits of said
receiving means of said monitor, and said means for indicating said
abnormal condition sensed of said monitor comprises electronic
circuit means including, an audio warning circuit connected to said
serial to parallel converter, a decoder circuit connected to said
serial to parallel converter, and a visual display circuit
connected to said decoder circuit.
66. A warning system according to claims 2, 3, 4, or 5, wherein
said transmitting means of said transmitter comprises a transmit
timing circuit connected to said parallel to serial converter, an
amplification circuit connected to said parallel to serial
74

converter, and an oscillator circuit connected to said
amplification circuit, and said coded signal generated comprises a
first part identifying the location of said remote source where
said abnormal condition is sensed, and a second part identifying
the type of abnormal condition sensed, and said coded signal
generated is transmitted by said transmitting means of said
transmitter as a radio frequency signal, and said means for
receiving said transmitted coded signal from said transmitter of
said monitor comprises an antenna, a tuned circuit connected to
said antenna, and amplification circuits connected to said tuned
circuit, and said decoding means of said monitor comprises a
universal asynchronous receiver/transmitter circuit as a serial to
parallel converter connected to said amplification circuits of said
receiving means of said monitor, and said means for indicating said
abnormal condition sensed of said monitor comprises electronic
circuit means including an audio warning circuit connected to said
serial to parallel converter, a decoder circuit connected to said
serial to parallel converter, and a visual display circuit
connected to said decoder circuit, and said matrix means of said
monitor for indicating the location of said transmitter includes
said visual display circuit in the form of an L.E.D. matrix.
67. A warning system according to claims 2, 3, 4, or 5, wherein
said coded signal generated comprises a first part identifying the
location of said remote source where said abnormal condition is
sensed, and a second part identifying the type of abnormal
condition sensed, and said coding means of said transmitter
comprises a dip switch assembly connected to said parallel to

serial converter for supplying said first part of said coded signal
identifying the location of said transmitter, and said transmitting
means of said transmitter comprises a transmit timing circuit
connected to said parallel to serial converter, an amplification
circuit connected to said parallel to serial converter, and an
oscillator circuit connected to said amplification circuit, and
said coded signal generated is transmitted by said transmitting
means of said transmitter as a radio frequency signal, and said
means for receiving said transmitted coded signal from said
transmitter of said monitor comprises an antenna, a tuned circuit
connected to said antenna, and amplification circuits connected to
said tuned circuit, and said decoding means of said monitor
comprises a universal asynchronous receiver/transmitter circuit as
a serial to parallel converter connected to said amplification
circuits of said receiving means of said monitor, and said means
for indicating said abnormal condition sensed of said monitor
comprises electronic circuit means including, an audio warning
circuit connected to said serial to parallel converter, a decoder
circuit connected to said serial to parallel converter, and a
visual display circuit connected to said decoder circuit.
68. A warning system according to claims 2, 3, 4, or 5, wherein
said coded signal generated comprises a first part identifying the
location of said remote source where said abnormal condition is
sensed, and a second part identifying the type of abnormal
condition sensed, and said coding means of said transmitter
comprises a dip switch assembly connected to said parallel to
serial converter for supplying said first part of said coded signal
76

identifying the location of said transmitter, and said transmitting
means of said transmitter comprises a transmit timing circuit
connected to said parallel to serial converter, an amplification
circuit connected to said parallel to serial converter, and an
oscillator circuit connected to said amplification circuit, and
said coded signal generated is transmitted by said transmitting
means of said transmitter as a radio frequency signal, and said
means for receiving said transmitted coded signal from said
transmitter of said monitor comprises an antenna, a tuned circuit
connected to said antenna, and amplification circuits connected to
said tuned circuit, and said decoding means of said monitor
comprises a universal asynchronous receiver/transmitter circuit as
a serial to parallel converter connected to said amplification
circuits of said receiving means of said monitor, and said means
for indicating said abnormal condition sensed of said monitor
comprises electronic circuit means including an audio warning
circuit connected to said serial to parallel converter, a decoder
circuit connected to said serial to parallel converter, and a
visual display circuit connected to said decoder circuit, and said
matrix means of said monitor for indicating the location of said
transmitter includes said visual display circuit in the form of an
L.E.D. matrix.
69. A warning system according to claims 2, 3, 4, or 5, wherein
said transmitting means of said transmitter comprises a transmit
timing circuit connected to said parallel to serial converter, an
inverter circuit connected to said parallel to serial converter, an
amplification circuit connected to said inverter circuit, and an
77

oscillator circuit connected to said amplification circuit, and
said coded signal generated is transmitted by said transmitting
means of said transmitter as a radio frequency signal, and said
means for receiving said transmitted coded signal from said
transmitter of said monitor comprises an antenna, a tuned circuit
connected to said antenna, amplification circuits connected to said
tuned circuit, and an inverter circuit connected to said
amplification circuits, and said decoding means of said monitor
comprises a serial to parallel converter connected to said inverter
circuit of said receiving means of said monitor, and said means for
indicating said abnormal condition sensed of said monitor comprises
electronic circuit means including, an audio warning circuit
connected to said serial to parallel converter, a decoder circuit
connected to said serial to parallel converter, and a visual
display circuit connected to said decoder circuit.
70. A warning system according to claims 2, 3, 4, or 5, wherein
said transmitting means of said transmitter comprises a transmit
timing circuit connected to said parallel to serial converter, an
inverter circuit connected to said parallel to serial converter, an
amplification circuit connected to said inverter circuit, and an
oscillator circuit connected to said amplification circuit, and
said coded signal generated is transmitted by said transmitting
means of said transmitter as a radio frequency signal, and said
means for receiving said transmitted coded signal from said
transmitter of said monitor comprises an antenna, a tuned circuit
connected to said antenna, amplification circuits connected to said
tuned circuit, and an inverter circuit connected to said
78

amplification circuits, and said decoding means of said monitor
comprises a serial to parallel converter connected to said inverter
circuit of said receiving means of said monitor, and said means for
indicating said abnormal condition sensed of said monitor comprises
electronic circuit means including an audio warning circuit
connected to said serial to parallel converter, a decoder circuit
connected to said serial to parallel converter, and a visual
display circuit connected to said decoder circuit, and said matrix
means of said monitor for indicating the location of said
transmitter includes said visual display circuit in the form of an
L.E.D. matrix.
71. A warning system according to claims 2, 3, 4, or 5, wherein
said transmitting means of said transmitter comprises a transmit
timing circuit connected to said parallel to serial converter, an
inverter circuit connected to said parallel to serial converter, an
amplification circuit connected to said inverter circuit, and an
oscillator circuit connected to said amplification circuit, and
said coded signal generated comprises a first part identifying the
location of said remote source where said abnormal condition is
sensed, and a second part identifying the type of abnormal
condition sensed, and said coded signal generated is transmitted by
said transmitting means of said transmitter as a radio frequency
signal, and said means for receiving said transmitted coded signal
from said transmitter of said monitor comprises an antenna, a tuned
circuit connected to said antenna, amplification circuits connected
to said tuned circuit, and an inverter circuit connected to said
amplification circuits, and said decoding means of said monitor
79

comprises a serial to parallel converter connected to said inverter
circuit of said receiving means of said monitor, and said means for
indicating said abnormal condition sensed of said monitor comprises
electronic circuit means including, an audio warning circuit
connected to said serial to parallel converter, a decoder circuit
connected to said serial to parallel converter, and a visual
display circuit connected to said decoder circuit.
72. A warning system according to claims 2, 3, 4, or 5, wherein
said transmitting means of said transmitter comprises a transmit
timing circuit connected to said parallel to serial converter, an
inverter circuit connected to said parallel to serial converter, an
amplification circuit connected to said inverter circuit, and an
oscillator circuit connected to said amplification circuit, and
said coded signal generated comprises a first part identifying the
location of said remote source where said abnormal condition is
sensed, and a second part identifying the type of abnormal
condition sensed, and said coded signal generated is transmitted by
said transmitting means of said transmitter as a radio frequency
signal, and said means for receiving said transmitted coded signal
from said transmitter of said monitor comprises an antenna, a tuned
circuit connected to said antenna, amplification circuits connected
to said tuned circuit, and an inverter circuit connected to said
amplification circuits, and said decoding means of said monitor
comprises a serial to parallel converter connected to said inverter
circuit of said receiving means of said monitor, and said means for
indicating said abnormal condition sensed of said monitor comprises
electronic circuit means including an audio warning circuit

connected to said serial to parallel converter, a decoder circuit
connected to said serial to parallel converter, and a visual
display circuit connected to said decoder circuit, and said matrix
means of said monitor for indicating the location of said
transmitter includes said visual display circuit in the form of an
L.E.D. matrix.
73. A warning system according to claims 2, 3, 4, or 5, wherein
said coded signal generated comprises a first part identifying the
location of said remote source where said abnormal condition is
sensed, and a second part identifying the type of abnormal
condition sensed, and said coding means of said transmitter
comprises a dip switch assembly connected to said parallel to
serial converter for supplying said first part of said coded signal
identifying the location of said transmitter, and said transmitting
means of such transmitter comprises a transmit timing circuit
connected to said parallel to serial converter, an inverter circuit
connected to said parallel to serial converter, an amplification
circuit connected to said inverter circuit, and an oscillator
circuit connected to said amplification circuit, and said coded
signal generated is transmitted by said transmitting means of said
transmitter as a radio frequency signal, and said means for
receiving said transmitted coded signal from said transmitter of
said monitor comprises an antenna, a tuned circuit connected to
said antenna, amplification circuits connected to said tuned
circuit, and an inverter circuit connected to said amplification
circuits, and said decoding means of said monitor comprises a
serial to parallel converter connected to said inverter circuit of
81

said receiving means of said monitor, and said means for indicating
said abnormal condition sensed of said monitor comprises electronic
circuit means including, an audio warning circuit connected to said
serial to parallel converter, a decoder circuit connected to said
serial to parallel converter, and a visual display circuit
connected to said decoder circuit.
74. A warning system according to claims 2, 3, 4, or 5, wherein
said coded signal generated comprises a first part identifying the
location of said remote source where said abnormal condition is
sensed, and a second part identifying the type of abnormal
condition sensed, and said coding means of said transmitter
comprises a dip switch assembly connected to said parallel to
serial converter for supplying said first part of said coded signal
identifying the location of said transmitter, and said transmitting
means of such transmitter comprises a transmit timing circuit
connected to said parallel to serial converter, an inverter circuit
connected to said parallel to serial converter, an amplification
circuit connected to said inverter circuit, and an oscillator
circuit connected to said amplification circuit, and said coded
signal generated is transmitted by said transmitting means of said
transmitter as a radio frequency signal, and said means for
receiving said transmitted coded signal from said transmitter of
said monitor comprises an antenna, a tuned circuit connected to
said antenna, amplification circuits connected to said tuned
circuit, and an inverter circuit connected to said amplification
circuits, and said decoding means of said monitor comprises a
serial to parallel converter connected to said inverter circuit of
82

said receiving means of said monitor, and said means for indicating
said abnormal condition sensed of said monitor comprises electronic
circuit means including an audio warning circuit connected to said
serial to parallel converter, a decoder circuit connected to said
serial to parallel converter, and a visual display circuit
connected to said decoder circuit, and said matrix means of said
monitor for indicating the location of said transmitter includes
said visual display circuit in the form of an L.E.D. matrix.
75. A warning system according to claims 2, 3, 4, or 5, wherein
said transmitting means of said transmitter comprises a transmit
timing circuit connected to said parallel to serial converter, an
inverter circuit connected to said parallel to serial converter, an
amplification circuit connected to said inverter circuit, and an
oscillator circuit connected to said amplification circuit, and
said coded signal generated is transmitted by said transmitting
means of said transmitter as a radio frequency signal, and said
means for receiving said transmitted coded signal from said
transmitter of said monitor comprises an antenna, a tuned circuit
connected to said antenna, amplification circuits connected to said
tuned circuit, and an inverter circuit connected to said
amplification circuits, and said decoding means of said monitor
comprises a universal asynchronous receiver/transmitter circuit as
a serial to parallel converter connected to said inverter circuit
of said receiving means of said monitor, and said means for
indicating said abnormal condition sensed of said monitor comprises
electronic circuit means including, an audio warning circuit
connected to said serial to parallel converter, a decoder circuit
83

connected to said serial to parallel converter, and a visual
display circuit connected to said decoder circuit.
76. A warning system according to claims 2, 3, 4, or 5, wherein
said transmitting means of said transmitter comprises a transmit
timing circuit connected to said parallel to serial converter, an
inverter circuit connected to said parallel to serial converter, an
amplification circuit connected to said inverter circuit, and an
oscillator circuit connected to said amplification circuit, and
said coded signal generated is transmitted by said transmitting
means of said transmitter as a radio frequency signal, and said
means for receiving said transmitted coded signal from said
transmitter of said monitor comprises an antenna, a tuned circuit
connected to said antenna, amplification circuits connected to said
tuned circuit, and an inverter circuit connected to said
amplification circuits, and said decoding means of said monitor
comprises 2 universal asynchronous receiver/transmitter circuit as
a serial to parallel converter connected to said inverter circuit
of said receiving means of said monitor, and said means for
indicating said abnormal condition sensed of said monitor comprises
electronic circuit means including an audio warning circuit
connected to said serial to parallel converter, a decoder circuit
connected to said serial to parallel converter, and a visual
display circuit connected to said decoder circuit, and said matrix
means of said monitor for indicating the location of said
transmitter includes said visual display circuit in the form of an
L.E.D. matrix.
84

77. A warning system according to claims 2, 3, 4, or 5, wherein
said transmitting means of said transmitter comprises a transmit
timing circuit connected to said parallel to serial converter, an
inverter circuit connected to said parallel to serial converter, an
amplification circuit connected to said inverter circuit, and an
oscillator circuit connected to said amplification circuit, and
said coded signal generated comprises a first part identifying the
location of said remote source where said abnormal condition is
sensed, and a second part identifying the type of abnormal
condition sensed, and said coded signal generated is transmitted by
said transmitting means of said transmitter as a radio frequency
signal, and said means for receiving said transmitted coded signal
from said transmitter of said monitor comprises an antenna, a tuned
circuit connected to said antenna, amplification circuits connected
to said tuned circuit, and an inverter circuit connected to said
amplification circuits, and said decoding means of said monitor
comprises a universal asynchronous receiver/transmitter circuit as
a serial to parallel converter connected to said inverter circuit
of said receiving means of said monitor, and said means for
indicating said abnormal condition sensed of said monitor comprises
electronic circuit means including, an audio warning circuit
connected to said serial to parallel converter, a decoder circuit
connected to said serial to parallel converter, and a visual
display circuit connected to said decoder circuit.
78. A warning system according to claims 2, 3, 4, or 5, wherein
said transmitting means of said transmitter comprises a transmit
timing circuit connected to said parallel to serial converter, an

inverter circuit connected to said parallel to serial converter, an
amplification circuit connected to said inverter circuit, and an
oscillator circuit connected to said amplification circuit, and
said coded signal generated comprises a first part identifying the
location of said remote source where said abnormal condition is
sensed, and a second part identifying the type of abnormal
condition sensed, and said coded signal generated is transmitted by
said transmitting means of said transmitter as a radio frequency
signal, and said means for receiving said transmitted coded signal
from said transmitter of said monitor comprises an antenna, a tuned
circuit connected to said antenna, amplification circuits connected
to said tuned circuit, and an inverter circuit connected to said
amplification circuits, and said decoding means of said monitor
comprises a universal asynchronous receiver/transmitter circuit as
a serial to parallel converter connected to said inverter circuit
of said receiving means of said monitor, and said means for
indicating said abnormal condition sensed of said monitor comprises
electronic circuit means including an audio warning circuit
connected to said serial to parallel converter, a decoder circuit
connected to said serial to parallel converter, and a visual
display circuit connected to said decoder circuit, and said matrix
means of said monitor for indicating the location of said
transmitter includes said visual display circuit in the form of an
L.E.D. matrix.
79. A warning system according to claims 2, 3, 4, or 5, wherein
said coded signal generated comprises a first part identifying the
location of said remote source where said abnormal condition is
86

sensed, and a second part identifying the type of abnormal
condition sensed, and said coding means of said transmitter
comprises a dip switch assembly connected to said parallel to
serial converter for supplying said first part of said coded signal
identifying the location of said transmitter, and said transmitting
means of such transmitter comprises a transmit timing circuit
connected to said parallel to serial converter, an inverter circuit
connected to said parallel to serial converter, an amplification
circuit connected to said inverter circuit, and an oscillator
circuit connected to said amplification circuit, and said coded
signal generated is transmitted by said transmitting means of said
transmitter as a radio frequency signal, and said means for
receiving said transmitted coded signal from said transmitter of
said monitor comprises an antenna, a tuned circuit connected to
said antenna, amplification circuits connected to said tuned
circuit, and an inverter circuit connected to said amplification
circuits, and said decoding means of said monitor comprises a
universal asynchronous receiver/transmitter circuit as a serial to
parallel converter connected to said inverter circuit of said
receiving means of said monitor, and said means for indicating said
abnormal condition sensed of said monitor comprises electronic
circuit means including, an audio warning circuit connected to said
serial to parallel converter, a decoder circuit connected to said
serial to parallel converter, and a visual display circuit
connected to said decoder circuit.
8. A warning system according to claims 2, 3, 4, or 5, wherein
said coded signal generated comprises a first part identifying the
87

location of said remote source where said abnormal condition is
sensed, and a second part identifying the type of abnormal
condition sensed, and said coding means of said transmitter
comprises a dip switch assembly connected to said parallel to
serial converter for supplying said first part of said coded signal
identifying the location of said transmitter, and said transmitting
means of such transmitter comprises a transmit timing circuit
connected to said parallel to serial converter, an inverter circuit
connected to said parallel to serial converter, an amplification
circuit connected to said inverter circuit, and an oscillator
circuit connected to said amplification circuit, and said coded
signal generated is transmitted by said transmitting means of said
transmitter as a radio frequency signal, and said means for
receiving said transmitted coded signal from said transmitter of
said monitor comprises an antenna, a tuned circuit connected to
said antenna, amplification circuits connected to said tuned
circuit, and an inverter circuit connected to said amplification
circuits, and said decoding means of said monitor comprises a
universal asynchronous receiver/transmitter circuit as a serial to
parallel converter connected to said inverter circuit of said
receiving means of said monitor, and said means for indicating said
abnormal condition sensed of said monitor comprises electronic
circuit means including an audio warning circuit connected to said
serial to parallel converter, a decoder circuit connected to said
serial to parallel converter, and a visual display circuit
connected to said decoder circuit, and said matrix means of said
88

monitor for indicating the location of said transmitter includes
said visual display circuit in the form of an L.E.D. matrix.
CLAIMS SUPPORTED BY SUPPLEMENTARY DISCLOSURE
81. A warning system according to claim 1 wherein said coding
means of said transmitter comprises an inverter circuit connected
to said silicon controlled rectifier gate array, an encoder circuit
connected to said inverter circuit, and a parallel to serial
converter connected to said encoder circuit.
82. A warning system according to claim 81 wherein said parallel
to serial converter of said coding means of said transmitter is a
universal asynchronous receiver/transmitter circuit.
83. A warning system according to claims 81, or 82, wherein said
transmitting means of said transmitter comprises a transmit timing
circuit connected to said parallel to serial converter.
84. A warning system according to claims 81, or 82, wherein said
transmitting means of said transmitter comprises a transmit timing
circuit connected to said parallel to serial converter, an
amplification circuit connected to said parallel to serial
converter, and an oscillator circuit connected to said
amplification circuit, and said coded signal generated is
transmitted by said transmitting means of said transmitter as a
radio frequency signal.
85. A warning system according to claims 81, or 82, wherein said
transmitting means of said transmitter comprises a transmit timing
circuit connected to said parallel to serial converter, a modulator
circuit connected to said parallel to serial converter, an
amplification circuit connected to said modulator circuit, and an
89

oscillator circuit connected to said amplification circuit, and
said coded signal generated is transmitted by said transmitting
means of said transmitter as a radio frequency signal.
86. A warning system according to claims 81, or 82, wherein said
coded signal generated comprises a first part identifying the
location of said remote source where said abnormal condition is
sensed, and a second part identifying the type of abnormal
condition sensed.
87. A warning system according to claims 81, or 82, wherein said
coded signal generated comprises a first part identifying the
location of said remote source where said abnormal condition is
sensed, and a second part identifying the type of abnormal
condition sensed, and said coding means of said transmitter
comprises a dip switch assembly connected to said parallel to
serial converter for supplying said first part of said coded signal
identifying the location of said transmitter.
88. A warning system according to claims 81, or 82, wherein said
transmitting means of said transmitter comprises a transmit timing
circuit connected to said parallel to serial converter, an
amplification circuit connected to said parallel to serial
converter, and an oscillator circuit connected to said
amplification circuit, and said coded signal generated comprises a
first part identifying the location of said remote source where
said abnormal condition is sensed, and a second part identifying
the type of abnormal condition sensed, and said coded signal
generated is transmitted by said transmitting means of said
transmitter as a radio frequency signal.

89. A warning system according to claims 81, or 82, wherein said
coded signal generated comprises a first part identifying the
location of said remote source where said abnormal condition is
sensed, and a second part identifying the type of abnormal
condition sensed, and said coding means of said transmitter
comprises a dip switch assembly connected to said parallel to
serial converter for supplying said first part of said coded signal
identifying the location of said transmitter, and said transmitting
means of said transmitter comprises a transmit timing circuit
connected to said parallel to serial converter, an amplification
circuit connected to said parallel to serial converter, and an
oscillator circuit connected to said amplification circuit, and
said coded signal generated is transmitted by said transmitting
means of said transmitter as a radio frequency signal.
90. A warning system according to claims 81, or 82, wherein said
transmitting means of said transmitter comprises a transmit timing
circuit connected to said parallel to serial converter, a modulator
circuit connected to said parallel to serial converter, an
amplification circuit connected to said modulator circuit, and an
oscillator circuit connected to said amplification circuit, and
said coded signal generated comprises a first part identifying the
location of said remote source where said abnormal condition is
sensed, and a second part identifying the type of abnormal
condition sensed, and said coded signal generated is transmitted by
said transmitting means of said transmitter as a radio frequency
signal.
91

91. A warning system according to claims 81, or 82, wherein said
coded signal generated comprises a first part identifying the
location of said remote source where said abnormal condition is
sensed, and a second part identifying the type of abnormal
condition sensed, and said coding means of said transmitter
comprises a dip switch assembly connected to said parallel to
serial converter for supplying said first part of said coded signal
identifying the location of said transmitter, and said transmitting
means of such transmitter comprises a transmit timing circuit
connected to said parallel to serial converter, a modulator circuit
connected to said parallel to serial converter, an amplification
circuit connected to said modulator circuit, and an oscillator
circuit connected to said amplification circuit, and said coded
signal generated is transmitted by said transmitting means of said
transmitter as a radio frequency signal.
92. A warning system according to claims 81, or 82, wherein said
decoding means of said monitor comprises a serial to parallel
converter.
93. A warning system according to claims 81, or 82, wherein said
decoding means of said monitor comprises a universal asynchronous
receiver/transmitter circuit as a serial to parallel converter.
94. A warning system according to claims 81, or 82, wherein said
transmitting means of said transmitter comprises a transmit timing
circuit connected to said parallel to serial converter, and said
decoding means of said monitor comprises a serial to parallel
converter.
92

95. A warning system according to claims 81, or 82, wherein said
transmitting means of said transmitter comprises a transmit timing
circuit connected to said parallel to serial converter, an
amplification circuit connected to said parallel to serial
converter, and an oscillator circuit connected to said
amplification circuit, and said coded signal generated is
transmitted by said transmitting means of said transmitter as a
radio frequency signal, and said decoding means of said monitor
comprises a serial to parallel converter.
96. A warning system according to claims 81, or 82, wherein said
transmitting means of said transmitter comprises a transmit timing
circuit connected to said parallel to serial converter, a modulator
circuit connected to said parallel to serial converter, an
amplification circuit connected to said modulator circuit, and an
oscillator circuit connected to said amplification circuit, and
said coded signal generated is transmitted by said transmitting
means of said transmitter as a radio frequency signal, and said
decoding means of said monitor comprises a serial to parallel
converter.
97. A warning system according to claims 81, or 82, wherein said
coded signal generated comprises a first part identifying the
location of said remote source where said abnormal condition is
sensed, and a second part identifying the type of abnormal
condition sensed, and said decoding means of said monitor comprises
a serial to parallel converter.
98. A warning system according to claims 81, or 82, wherein said
coded signal generated comprises a first part identifying the
93

location of said remote source where said abnormal condition is
sensed, and a second part identifying the type of abnormal
condition sensed, and said coding means of said transmitter
comprises a dip switch assembly connected to said parallel to
serial converter for supplying said first part of said coded signal
identifying the location of said transmitter, and said decoding
means of said monitor comprises a serial to parallel converter.
99. A warning system according to claims 81, or 82, wherein said
transmitting means of said transmitter comprises a transmit timing
circuit connected to said parallel to serial converter, an
amplification circuit connected to said parallel to serial
converter, and an oscillator circuit connected to said
amplification circuit, and said coded signal generated comprises a
first part identifying the location of said remote source where
said abnormal condition is sensed, and a second part identifying
the type of abnormal condition sensed, and said coded signal
generated is transmitted by said transmitting means of said
transmitter as a radio frequency signal, and said decoding means of
said monitor comprises a serial to parallel converter.
100. A warning system according to claims 81, or 82, wherein said
coded signal generated comprises a first part identifying the
location of said remote source where said abnormal condition is
sensed, and a second part identifying the type of abnormal
condition sensed, and said coding means of said transmitter
comprises a dip switch assembly connected to said parallel to
serial converter for supplying said first part of said coded signal
identifying the location of said transmitter, and said transmitting
94

means of said transmitter comprises a transmit timing circuit
connected to said parallel to serial converter, an amplification
circuit connected to said parallel to serial converter, and an
oscillator circuit connected to said amplification circuit, and
said coded signal generated is transmitted by said transmitting
means of said transmitter as a radio frequency signal, and said
decoding means of said monitor comprises a serial to parallel
converter.
101. A warning system according to claims 81, or 82, wherein said
transmitting means of said transmitter comprises a transmit timing
circuit connected to said parallel to serial converter, a modulator
circuit connected to said parallel to serial converter, an
amplification circuit connected to said modulator circuit, and an
oscillator circuit connected to said amplification circuit, and
said coded signal generated comprises a first part identifying the
location of said remote source where said abnormal condition is
sensed, and a second part identifying the type of abnormal
condition sensed, and said coded signal generated is transmitted by
said transmitting means of said transmitter as a radio frequency
signal, and said decoding means of said monitor comprises a serial
to parallel converter.
102. A warning system according to claims 81, or 82, wherein said
coded signal generated comprises a first part identifying the
location of said remote source where said abnormal condition is
sensed, and a second part identifying the type of abnormal
condition sensed, and said coding means of said transmitter
comprises a dip switch assembly connected to said parallel to

serial converter for supplying said first part of said coded signal
identifying the location of said transmitter, and said transmitting
means of such transmitter comprises a transmit timing circuit
connected to said parallel to serial converter, a modulator circuit
connected to said parallel to serial converter, an amplification
circuit connected to said modulator circuit, and an oscillator
circuit connected to said amplification circuit, and said coded
signal generated is transmitted by said transmitting means of said
transmitter as a radio frequency signal, and said decoding means of
said monitor comprises a serial to parallel converter.
103. A warning system according to claims 81, or 82, wherein said
transmitting means of said transmitter comprises a transmit timing
circuit connected to said parallel to serial converter, and said
decoding means of said monitor comprises a universal asynchronous
receiver/transmitter circuit as a serial to parallel converter.
104. A warning system according to claims 81, or 82, wherein said
transmitting means of said transmitter comprises a transmit timing
circuit connected to said parallel to serial converter, an
amplification circuit connected to said parallel to serial
converter, and an oscillator circuit connected to said
amplification circuit, and said coded signal generated is
transmitted by said transmitting means of said transmitter as a
radio frequency signal, and said decoding means of said monitor
comprises a universal asynchronous receiver/transmitter circuit as
a serial to parallel converter.
105. A warning system according to claims 81, or 82, wherein said
transmitting means of said transmitter comprises a transmit timing
96

circuit connected to said parallel to serial converter, a modulator
circuit connected to said parallel to serial converter, an
amplification circuit connected to said modulator circuit, and an
oscillator circuit connected to said amplification circuit, and
said coded signal generated is transmitted by said transmitting
means of said transmitter as a radio frequency signal, and said
decoding means of said monitor comprises a universal asynchronous
receiver/transmitter circuit as a serial to parallel converter.
106. A warning system according to claims 81, or 82, wherein said
coded signal generated comprises a first part identifying the
location of said remote source where said abnormal condition is
sensed, and a second part identifying the type of abnormal
condition sensed, and said decoding means of said monitor comprises
a universal asynchronous receiver/transmitter circuit as a serial
to parallel converter.
107. A warning system according to claims 81, or 82, wherein said
coded signal generated comprises a first part identifying the
location of said remote source where said abnormal condition is
sensed, and a second part identifying the type of abnormal
condition sensed, and said coding means of said transmitter
comprises a dip switch assembly connected to said parallel to
serial converter for supplying said first part of said coded signal
identifying the location of said transmitter, and said decoding
means of said monitor comprises a universal asynchronous
receiver/transmitter circuit as a serial to parallel converter.
108. A warning system according to claims 81, or 82, wherein said
transmitting means of said transmitter comprises a transmit timing
97

circuit connected to said parallel to serial converter, an
amplification circuit connected to said parallel to serial
converter, and an oscillator circuit connected to said
amplification circuit, and said coded signal generated comprises a
first part identifying the location of said remote source where
said abnormal condition is sensed, and a second part identifying
the type of abnormal condition sensed, and said coded signal
generated is transmitted by said transmitting means of said
transmitter as a radio frequency signal, and said decoding means of
said monitor comprises a universal asynchronous
receiver/transmitter circuit as a serial to parallel converter.
109. A warning system according to claims 81, or 82, wherein said
coded signal generated comprises a first part identifying the
location of said remote source where said abnormal condition is
sensed, and a second part identifying the type of abnormal
condition sensed, and said coding means of said transmitter
comprises a dip switch assembly connected to said parallel to
serial converter for supplying said first part of said coded signal
identifying the location of said transmitter, and said transmitting
means of said transmitter comprises a transmit timing circuit
connected to said parallel to serial converter, an amplification
circuit connected to said parallel to serial converter, and an
oscillator circuit connected to said amplification circuit, and
said coded signal generated is transmitted by said transmitting
means of said transmitter as a radio frequency signal, and said
decoding means of said monitor comprises a universal asynchronous
receiver/transmitter circuit as a serial to parallel converter.
98

110. A warning system according to claims 81, or 82, wherein said
transmitting means of said transmitter comprises a transmit timing
circuit connected to said parallel to serial converter, a modulator
circuit connected to said parallel to serial converter, an
amplification circuit connected to said modulator circuit, and an
oscillator circuit connected to said amplification circuit, and
said coded signal generated comprises a first part identifying the
location of said remote source where said abnormal condition is
sensed, and a second part identifying the type of abnormal
condition sensed, and said coded signal generated is transmitted by
said transmitting means of said transmitter as a radio frequency
signal, and said decoding means of said monitor comprises a
universal asynchronous receiver/transmitter circuit as a serial to
parallel converter.
111. A warning system according to claims 81, or 82, wherein said
coded signal generated comprises a first part identifying the
location of said remote source where said abnormal condition is
sensed, and a second part identifying the type of abnormal
condition sensed, and said coding means of said transmitter
comprises a dip switch assembly connected to said parallel to
serial converter for supplying said first part of said coded signal
identifying the location of said transmitter, and said transmitting
means of such transmitter comprises a transmit timing circuit
connected to said parallel to serial converter, a modulator circuit
connected to said parallel to serial converter, an amplification
circuit connected to said modulator circuit, and an oscillator
circuit connected to said amplification circuit, and said coded
99

signal generated is transmitted by said transmitting means of said
transmitter as a radio frequency signal, and said decoding means of
said monitor comprises a universal asynchronous
receiver/transmitter circuit as a serial to parallel converter.
112. A warning system according to claims 81, or 82, wherein said
transmitting means of said transmitter comprises a transmit timing
circuit connected to said parallel to serial converter, a modulator
circuit connected to said parallel to serial converter, an
amplification circuit connected to said modulator circuit, and an
oscillator circuit connected to said amplification circuit, and
said coded signal generated is transmitted by said transmitting
means of said transmitter as a radio frequency signal, and said
means for receiving said transmitted coded signal from said
transmitter of said monitor comprises an antenna, a tuned circuit
connected to said antenna, amplification circuits connected to said
tuned circuit, and a demodulator circuit connected to said
amplification circuit.
113. A warning system according to claims 81, or 82, wherein said
transmitting means of said transmitter comprises a transmit timing
circuit connected to said parallel to serial converter, a modulator
circuit connected to said parallel to serial converter, an
amplification circuit connected to said modulator circuit, and an
oscillator circuit connected to said amplification circuit, and
said coded signal generated comprises a first part identifying the
location of said remote source where said abnormal condition is
sensed, and a second part identifying the type of abnormal
condition sensed, and said coded signal generated is transmitted by
100

said transmitting means of said transmitter as a radio frequency
signal, and said means for receiving said transmitted coded signal
from said transmitter of said monitor comprises an antenna, a tuned
circuit connected to said antenna, amplification circuits connected
to said tuned circuit, and a demodulator circuit connected to said
amplification circuit.
114. A warning system according to claims 81, or 82, wherein said
coded signal generated comprises a first part identifying the
location of said remote source where said abnormal condition is
sensed, and a second part identifying the type of abnormal
condition sensed, and said coding means of said transmitter
comprises a dip switch assembly connected to said parallel to
serial converter for supplying said first part of said coded signal
identifying the location of said transmitter, and said transmitting
means of such transmitter comprises a transmit timing circuit
connected to said parallel to serial converter, a modulator circuit
connected to said parallel to serial converter, an amplification
circuit connected to said modulator circuit, and an oscillator
circuit connected to said amplification circuit, and said coded
signal generated is transmitted by said transmitting means of said
transmitter as a radio frequency signal, and said means for
receiving said transmitted coded signal from said transmitter of
said monitor comprises an antenna, a tuned circuit connected to
said antenna, amplification circuits connected to said tuned
circuit, and a demodulator circuit connected to said amplification
circuit.
101

115. A warning system according to claims 81, or 82, wherein said
transmitting means of said transmitter comprises a transmit timing
circuit connected to said parallel to serial converter, a modulator
circuit connected to said parallel to serial converter, an
amplification circuit connected to said modulator circuit, and an
oscillator circuit connected to said amplification circuit, and
said coded signal generated is transmitted by said transmitting
means of said transmitter as a radio frequency signal, and said
means for receiving said transmitted coded signal from said
transmitter of said monitor comprises an antenna, a tuned circuit
connected to said antenna, amplification circuits connected to said
tuned circuit, and a demodulator circuit connected to said
amplification circuit, and said decoding means of said monitor
comprises a serial to parallel converter connected to said
demodulator circuit of said receiving means of said monitor.
116. A warning system according to claims 81, or 82, wherein said
transmitting means of said transmitter comprises a transmit timing
circuit connected to said parallel to serial converter, a modulator
circuit connected to said parallel to serial converter, an
amplification circuit connected to said modulator circuit, and an
oscillator circuit connected to said amplification circuit, and
said coded signal generated comprises a first part identifying the
location of said remote source where said abnormal condition is
sensed, and a second part identifying the type of abnormal
condition sensed, and said coded signal generated is transmitted by
said transmitting means of said transmitter as a radio frequency
signal, and said means for receiving said transmitted coded signal
102

from said transmitter of said monitor comprises an antenna, a tuned
circuit connected to said antenna, amplification circuits connected
to said tuned circuit, and a demodulator circuit connected to said
amplification circuit, and said decoding means of said monitor
comprises a serial to parallel converter connected to said
demodulator circuit of said receiving means of said monitor.
117. A warning system according to claims 81, or 82, wherein said
coded signal generated comprises a first part identifying the
location of said remote source where said abnormal condition is
sensed, and a second part identifying the type of abnormal
condition sensed, and said coding means of said transmitter
comprises a dip switch assembly connected to said parallel to
serial converter for supplying said first part of said coded signal
identifying the location of said transmitter, and said transmitting
means of such transmitter comprises a transmit timing circuit
connected to said parallel to serial converter, a modulator circuit
connected to said parallel to serial converter, an amplification
circuit connected to said modulator circuit, and an oscillator
circuit connected to said amplification circuit, and said coded
signal generated is transmitted by said transmitting means of said
transmitter as a radio frequency signal, and said means for
receiving said transmitted coded signal from said transmitter of
said monitor comprises an antenna, a tuned circuit connected to
said antenna, amplification circuits connected to said tuned
circuit, and a demodulator circuit connected to said amplification
circuit, and said decoding means of said monitor comprises a serial
103

to parallel converter connected to said demodulator circuit of said
receiving means of said monitor.
118. A warning system according to claims 81, or 82, wherein said
transmitting means of said transmitter comprises a transmit timing
circuit connected to said parallel to serial converter, a modulator
circuit connected to said parallel to serial converter, an
amplification circuit connected to said modulator circuit, and an
oscillator circuit connected to said amplification circuit, and
said coded signal generated is transmitted by said transmitting
means of said transmitter as a radio frequency signal, and said
means for receiving said transmitted coded signal from said
transmitter of said monitor comprises an antenna, a tuned circuit
connected to said antenna, amplification circuits connected to said
tuned circuit, and a demodulator circuit connected to said
amplification circuit, and said decoding means of said monitor
comprises a universal asynchronous receiver/transmitter circuit as
a serial to parallel converter connected to said demodulator
circuit of said receiving means of said monitor.
119. A warning system according to claims 81, or 82, wherein said
transmitting means of said transmitter comprises a transmit timing
circuit connected to said parallel to serial converter, a modulator
circuit connected to said parallel to serial converter, an
amplification circuit connected to said modulator circuit, and an
oscillator circuit connected to said amplification circuit, and
said coded signal generated comprises a first part identifying the
location of said remote source where said abnormal condition is
sensed, and a second part identifying the type of abnormal
104

condition sensed, and said coded signal generated is transmitted by
said transmitting means of said transmitter as a radio frequency
signal, and said means for receiving said transmitted coded signal
from said transmitter of said monitor comprises an antenna, a tuned
circuit connected to said antenna, amplification circuits connected
to said tuned circuit, and a demodulator circuit connected to said
amplification circuit, and said decoding means of said monitor
comprises a universal asynchronous receiver/transmitter circuit as
a serial to parallel converter connected to said demodulator
circuit of said receiving means of said monitor.
120. A warning system according to claims 81, or 82, wherein said
coded signal generated comprises a first part identifying the
location of said remote source where said abnormal condition is
sensed, and a second part identifying the type of abnormal
condition sensed, and said coding means of said transmitter
comprises a dip switch assembly connected to said parallel to
serial converter for supplying said first part of said coded signal
identifying the location of said transmitter, and said transmitting
means of such transmitter comprises a transmit timing circuit
connected to said parallel to serial converter, a modulator circuit
connected to said parallel to serial converter, an amplification
circuit connected to said modulator circuit, and an oscillator
circuit connected to said amplification circuit, and said coded
signal generated is transmitted by said transmitting means of said
transmitter as a radio frequency signal, and said means for
receiving said transmitted coded signal from said transmitter of
said monitor comprises an antenna, a tuned circuit connected to
105

said antenna, amplification circuits connected to said tuned
circuit, and a demodulator circuit connected to said amplification
circuit, and said decoding means of said monitor comprises a
universal asynchronous receiver/transmitter circuit as a serial to
parallel converter connected to said demodulator circuit of said
receiving means of said monitor.
121. A warning system according to claims 81, or 82, wherein said
decoding means of said monitor comprises a serial to parallel
converter, and said means for indicating said abnormal condition
sensed of said monitor comprises electronic circuit means
including, an audio warning circuit connected to said serial to
parallel converter, a decoder circuit connected to said serial to
parallel converter, and a visual display circuit connected to said
decoder circuit.
122. A warning system according to claims 81, or 82, wherein said
decoding means of said monitor comprises a serial to parallel
converter, and said means for indicating said abnormal condition
sensed of said monitor comprises electronic circuit means including
an audio warning circuit connected to said serial to parallel
converter, a decoder circuit connected to said serial to parallel
converter, and a visual display circuit connected to said decoder
circuit, and said matrix means of said monitor for indicating the
location of said transmitter includes said visual display circuit
in the form of an L.E.D. matrix.
123. A warning system according to claims 81, or 82, wherein said
decoding means of said monitor comprises a universal asynchronous
receiver/transmitter circuit as a serial to parallel converter, and
106

said means for indicating said abnormal condition sensed of said
monitor comprises electronic circuit means including, an audio
warning circuit connected to said serial to parallel converter, a
decoder circuit connected to said serial to parallel converter, and
a visual display circuit connected to said decoder circuit.
124. A warning system according to claims 81, or 82, wherein said
decoding means of said monitor comprises a universal asynchronous
receiver/transmitter circuit as a serial to parallel converter, and
said means for indicating said abnormal condition sensed of said
monitor comprises electronic circuit means including an audio
warning circuit connected to said serial to parallel converter, a
decoder circuit connected to said serial to parallel converter, and
a visual display circuit connected to said decoder circuit, and
said matrix means of said monitor for indicating the location of
said transmitter includes said visual display circuit in the form
of an L.E.D. matrix.
125. A warning system according to claims 81, or 82, wherein said
transmitting means of said transmitter comprises a transmit timing
circuit connected to said parallel to serial converter, a modulator
circuit connected to said parallel to serial converter, an
amplification circuit connected to said modulator circuit, and an
oscillator circuit connected to said amplification circuit, and
said coded signal generated is transmitted by said transmitting
means of said transmitter as a radio frequency signal, and said
means for receiving said transmitted coded signal from said
transmitter of said monitor comprises an antenna, a tuned circuit
connected to said antenna, amplification circuits connected to said
107

tuned circuit, and a demodulator circuit connected to said
amplification circuit, and said decoding means of said monitor
comprises a serial to parallel converter connected to said
demodulator circuit of said receiving means of said monitor, and
said means for indicating said abnormal condition sensed of said
monitor comprises electronic circuit means including, an audio
warning circuit connected to said serial to parallel converter, a
decoder circuit connected to said serial to parallel converter, and
a visual display circuit connected to said decoder circuit.
126. A warning system according to claims 81, or 82, wherein said
transmitting means of said transmitter comprises a transmit timing
circuit connected to said parallel to serial converter, a modulator
circuit connected to said parallel to serial converter, an
amplification circuit connected to said modulator circuit, and an
oscillator circuit connected to said amplification circuit, and
said coded signal generated is transmitted by said transmitting
means of said transmitter as a radio frequency signal, and said
means for receiving said transmitted coded signal from said
transmitter of said monitor comprises an antenna, a tuned circuit
connected to said antenna, amplification circuits connected to said
tuned circuit, and a demodulator circuit connected to said
amplification circuit, and said decoding means of said monitor
comprises a serial to parallel converter connected to said
demodulator circuit of said receiving means of said monitor, and
said means for indicating said abnormal condition sensed of said
monitor comprises electronic circuit means including an audio
warning circuit connected to said serial to parallel converter, a
108

decoder circuit connected to said serial to parallel converter, and
a visual display circuit connected to said decoder circuit, and
said matrix means of said monitor for indicating the location of
said transmitter includes said visual display circuit in the form
of an L.E.D. matrix.
127. A warning system according to claims 81, or 82, wherein said
transmitting means of said transmitter comprises a transmit timing
circuit connected to said parallel to serial converter, a modulator
circuit connected to said parallel to serial converter, an
amplification circuit connected to said modulator circuit, and an
oscillator circuit connected to said amplification circuit, and
said coded signal generated comprises a first part identifying the
location of said remote source where said abnormal condition is
sensed, and a second part identifying the type of abnormal
condition sensed, and said coded signal generated is transmitted by
said transmitting means of said transmitter as a radio frequency
signal, and said means for receiving said transmitted coded signal
from said transmitter of said monitor comprises an antenna, a tuned
circuit connected to said antenna, amplification circuits connected
to said tuned circuit, and a demodulator circuit connected to said
amplification circuit, and said decoding means of said monitor
comprises a serial to parallel converter connected to said
demodulator circuit of said receiving means of said monitor, and
said means for indicating said abnormal condition sensed of said
monitor comprises electronic circuit means including, an audio
warning circuit connected to said serial to parallel converter, a
109

decoder circuit connected to said serial to parallel converter, and
a visual display circuit connected to said decoder circuit.
128. A warning system according to claims 81, or 82, wherein said
transmitting means of said transmitter comprises a transmit timing
circuit connected to said parallel to serial converter, a modulator
circuit connected to said parallel to serial converter, an
amplification circuit connected to said modulator circuit, and an
oscillator circuit connected to said amplification circuit, and
said coded signal generated comprises a first part identifying the
location of said remote source where said abnormal condition is
sensed, and a second part identifying the type of abnormal
condition sensed, and said coded signal generated is transmitted by
said transmitting means of said transmitter as a radio frequency
signal, and said means for receiving said transmitted coded signal
from said transmitter of said monitor comprises an antenna, a tuned
circuit connected to said antenna, amplification circuits connected
to said tuned circuit, and a demodulator circuit connected to said
amplification circuit, and said decoding means of said monitor
comprises a serial to parallel converter connected to said
demodulator circuit of said receiving means of said monitor, and
said means for indicating said abnormal condition sensed of said
monitor comprises electronic circuit means including an audio
warning circuit connected to said serial to parallel converter, a
decoder circuit connected to said serial to parallel converter, and
a visual display circuit connected to said decoder circuit, and
said matrix means of said monitor for indicating the location of
110

said transmitter includes said visual display circuit in the form
of an L.E.D. matrix.
129. A warning system according to claims 81, or 82, wherein said
coded signal generated comprises a first part identifying the
location of said remote source where said abnormal condition is
sensed, and a second part identifying the type of abnormal
condition sensed, and said coding means of said transmitter
comprises a dip switch assembly connected to said parallel to
serial converter for supplying said first part of said coded signal
identifying the location of said transmitter, and said transmitting
means of such transmitter comprises a transmit timing circuit
connected to said parallel to serial converter, a modulator circuit
connected to said parallel to serial converter, an amplification
circuit connected to said modulator circuit, and an oscillator
circuit connected to said amplification circuit, and said coded
signal generated is transmitted by said transmitting means of said
transmitter as a radio frequency signal, and said means for
receiving said transmitted coded signal from said transmitter of
said monitor comprises an antenna, a tuned circuit connected to
said antenna, amplification circuits connected to said tuned
circuit, and a demodulator circuit connected to said amplification
circuit, and said decoding means of said monitor comprises a serial
to parallel converter connected to said demodulator circuit of said
receiving means of said monitor, and said means for indicating said
abnormal condition sensed of said monitor comprises electronic
circuit means including, an audio warning circuit connected to said
serial to parallel converter, a decoder circuit connected to said
111

serial to parallel converter, and a visual display circuit
connected to said decoder circuit.
130. A warning system according to claims 81, or 82, wherein said
coded signal generated comprises a first part identifying the
location of said remote source where said abnormal condition is
sensed, and a second part identifying the type of abnormal
condition sensed, and said coding means of said transmitter
comprises a dip switch assembly connected to said parallel to
serial converter for supplying said first part of said coded signal
identifying the location of said transmitter, and said transmitting
means of such transmitter comprises a transmit timing circuit
connected to said parallel to serial converter, a modulator circuit
connected to said parallel to serial converter, an amplification
circuit connected to said modulator circuit, and an oscillator
circuit connected to said amplification circuit, and said coded
signal generated is transmitted by said transmitting means of said
transmitter as a radio frequency signal, and said means for
receiving said transmitted coded signal from said transmitter of
said monitor comprises an antenna, a tuned circuit connected to
said antenna, amplification circuits connected to said tuned
circuit, and a demodulator circuit connected to said amplification
circuit, and said decoding means of said monitor comprises a serial
to parallel converter connected to said demodulator circuit of said
receiving means of said monitor, and said means for indicating said
abnormal condition sensed of said monitor comprises electronic
circuit means including an audio warning circuit connected to said
serial to parallel converter, a decoder circuit connected to said
112

serial to parallel converter, and a visual display circuit
connected to said decoder circuit, and said matrix means of said
monitor for indicating the location of said transmitter includes
said visual display circuit in the form of an L.E.D. matrix.
131. A warning system according to claims 81, or 82, wherein said
transmitting means of said transmitter comprises a transmit timing
circuit connected to said parallel to serial converter, a modulator
circuit connected to said parallel to serial converter, an
amplification circuit connected to said modulator circuit, and an
oscillator circuit connected to said amplification circuit, and
said coded signal generated is transmitted by said transmitting
means of said transmitter as a radio frequency signal, and said
means for receiving said transmitted coded signal from said
transmitter of said monitor comprises an antenna, a tuned circuit
connected to said antenna, amplification circuits connected to said
tuned circuit, and a demodulator circuit connected to said
amplification circuit, and said decoding means of said monitor
comprises a universal asynchronous receiver/transmitter circuit as
a serial to parallel converter connected to said demodulator
circuit of said receiving means of said monitor, and said means for
indicating said abnormal condition sensed of said monitor comprises
electronic circuit means including, an audio warning circuit
connected to said serial to parallel converter, a decoder circuit
connected to said serial to parallel converter, and a visual
display circuit connected to said decoder circuit.
132. A warning system according to claims 81, or 82, wherein said
transmitting means of said transmitter comprises a transmit timing
113

circuit connected to said parallel to serial converter, a modulator
circuit connected to said parallel to serial converter, an
amplification circuit connected to said modulator circuit, and an
oscillator circuit connected to said amplification circuit, and
said coded signal generated is transmitted by said transmitting
means of said transmitter as a radio frequency signal, and said
means for receiving said transmitted coded signal from said
transmitter of said monitor comprises an antenna, a tuned circuit
connected to said antenna, amplification circuits connected to said
tuned circuit, and a demodulator circuit connected to said
amplification circuit, and said decoding means of said monitor
comprises a universal asynchronous receiver/transmitter circuit as
a serial to parallel converter connected to said demodulator
circuit of said receiving means of said monitor, and said means for
indicating said abnormal condition sensed of said monitor comprises
electronic circuit means including an audio warning circuit
connected to said serial to parallel converter, a decoder circuit
connected to said serial to parallel converter, and a visual
display circuit connected to said decoder circuit, and said matrix
means of said monitor for indicating the location of said
transmitter includes said visual display circuit in the form of an
L.E.D. matrix.
133. A warning system according to claims 81, or 82, wherein said
transmitting means of said transmitter comprises a transmit timing
circuit connected to said parallel to serial converter, a modulator
circuit connected to said parallel to serial converter, an
amplification circuit connected to said modulator circuit, and an
114

oscillator circuit connected to said amplification circuit, and
said coded signal generated comprises a first part identifying the
location of said remote source where said abnormal condition is
sensed, and a second part identifying the type of abnormal
condition sensed, and said coded signal generated is transmitted by
said transmitting means of said transmitter as a radio frequency
signal, and said means for receiving said transmitted coded signal
from said transmitter of said monitor comprises an antenna, a tuned
circuit connected to said antenna, amplification circuits connected
to said tuned circuit, and a demodulator circuit connected to said
amplification circuit, and said decoding means of said monitor
comprises a universal asynchronous receiver/transmitter circuit as
a serial to parallel converter connected to said demodulator
circuit of said receiving means of said monitor, and said means for
indicating said abnormal condition sensed of said monitor comprises
electronic circuit means including, an audio warning circuit
connected to said serial to parallel converter, a decoder circuit
connected to said serial to parallel converter, and a visual
display circuit connected to said decoder circuit.
134. A warning system according to claims 81, or 82, wherein said
transmitting means of said transmitter comprises a transmit timing
circuit connected to said parallel to serial converter, a modulator
circuit connected to said parallel to serial converter, an
amplification circuit connected to said modulator circuit, and an
oscillator circuit connected to said amplification circuit, and
said coded signal generated comprises a first part identifying the
location of said remote source where said abnormal condition is
115

sensed, and a second part identifying the type of abnormal
condition sensed, and said coded signal generated is transmitted by
said transmitting means of said transmitter as a radio frequency
signal, and said means for receiving said transmitted coded signal
from said transmitter of said monitor comprises an antenna, a tuned
circuit connected to said antenna, amplification circuits connected
to said tuned circuit, and a demodulator circuit connected to said
amplification circuit, and said decoding means of said monitor
comprises a universal asynchronous receiver/transmitter circuit as
a serial to parallel converter connected to said demodulator
circuit of said receiving means of said monitor, and said means for
indicating said abnormal condition sensed of said monitor comprises
electronic circuit means including an audio warning circuit
connected to said serial to parallel converter, a decoder circuit
connected to said serial to parallel converter, and a visual
display circuit connected to said decoder circuit, and said matrix
means of said monitor for indicating the location of said
transmitter includes said visual display circuit in the form of an
L.E.D. matrix.
135. A warning system according to claims 81, or 82, wherein said
coded signal generated comprises a first part identifying the
location of said remote source where said abnormal condition is
sensed, and a second part identifying the type of abnormal
condition sensed, and said coding means of said transmitter
comprises a dip switch assembly connected to said parallel to
serial converter for supplying said first part of said coded signal
identifying the location of said transmitter, and said transmitting
116

means of such transmitter comprises a transmit timing circuit
connected to said parallel to serial converter, a modulator circuit
connected to said parallel to serial converter, an amplification
circuit connected to said modulator circuit, and an oscillator
circuit connected to said amplification circuit, and said coded
signal generated is transmitted by said transmitting means of said
transmitter as a radio frequency signal, and said means for
receiving said transmitted coded signal from said transmitter of
said monitor comprises an antenna, a tuned circuit connected to
said antenna, amplification circuits connected to said tuned
circuit, and a demodulator circuit connected to said amplification
circuit, and said decoding means of said monitor comprises a
universal asynchronous receiver/transmitter circuit as a serial to
parallel converter connected to said demodulator circuit of said
receiving means of said monitor, and said means for indicating said
abnormal condition sensed of said monitor comprises electronic
circuit means including, an audio warning circuit connected to said
serial to parallel converter, a decoder circuit connected to said
serial to parallel converter, and a visual display circuit
connected to said decoder circuit.
136. A warning system according to claims 81, or 82, wherein said
coded signal generated comprises a first part identifying the
location of said remote source where said abnormal condition is
sensed, and a second part identifying the type of abnormal
condition sensed, and said coding means of said transmitter
comprises a dip switch assembly connected to said parallel to
serial converter for supplying said first part of said coded signal
117

identifying the location of said transmitter, and said transmitting
means of such transmitter comprises a transmit timing circuit
connected to said parallel to serial converter, a modulator circuit
connected to said parallel to serial converter, an amplification
circuit connected to said modulator circuit, and an oscillator
circuit connected to said amplification circuit, and said coded
signal generated is transmitted by said transmitting means of said
transmitter as a radio frequency signal, and said means for
receiving said transmitted coded signal from said transmitter of
said monitor comprises an antenna, a tuned circuit connected to
said antenna, amplification circuits connected to said tuned
circuit, and a demodulator circuit connected to said amplification
circuit, and said decoding means of said monitor comprises a
universal asynchronous receiver/transmitter circuit as a serial to
parallel converter connected to said demodulator circuit of said
receiving means of said monitor, and said means for indicating said
abnormal condition sensed of said monitor comprises electronic
circuit means including an audio warning circuit connected to said
serial to parallel converter, a decoder circuit connected to said
serial to parallel converter, and a visual display circuit
connected to said decoder circuit, and said matrix means of said
monitor for indicating the location of said transmitter includes
said visual display circuit in the form of an L.E.D. matrix.
118

Description

i3~)~34~3
Field of thQ In~en~ion
This invention relates to improvements in an electronic
warning apparatus comprising a monitor, for receiving a coded radio
frequency signal, and at least one transmitter unit and associated
sensors for producing the coded radio frequency signal upon
detecting an abnormal condition at the location of the sensors.
The monitor including means for providing appropriate visual and
audio alarms upon reception of the signal.
Particularly, this invention relates to improvements in an
electronic warning apparatus for u~e in vehicles, such as tractor
trailers, wherein the ~ransmitting unit is located remotely from
the monitor and transmits a coded radio fxequency signal upon
detecting through its associated sensors an abnormal condition such
as low tire pressure, excessive heat generated by failing wheel
bearings, locked or over heated brakes, or abnormal conditions
caused by other malfunc~ions resulting in excessive heat, as well
as excessive vibrations caused by a wheel bearing, loose lug nut on
the wheel, a broken steel belt in the tire, separation of the
recapped tire, or other disturbances which would give rise to
excessive vibration.
Moreover, this invention relates to improvements in an
electronic warning apparatus wherein the transmitters transmit a
coded radio frequency signal upon detection of an abnormal
condition at the location of the sensors: the coded radio frequency
signal comprising a location code so the monitor, upon reception of
the radio frequency signal, can distinguish which of the associated
~L-

~3~84~3
transmitters detected the abnormal condition as well as the type of
abnormal condition detected.
Background of the Invention
Systems under consideration normally comprise miniature
electronic apparatus including means for detecting abnormal tire
pressure as well as sensing means for detecting trailer wheel
bearing temperature.
One example of miniaturized electronic apparatus for detecting
malfunction from a source on a vehicle is that disclosed in United
States patent 3,491,335.
United States patent 3,491l335, discloses a temperature
detection system wherein a temperature sensor controls a
transmitter that emits a signal to a remote receiver upon detecting
excessive heat, activating a warning device.
U.S.P. 3,491,335 further discloses the use of a temperature
sensor which can be utilized to energize a transmitter that emits
a radio ~requency signal to a remote receiver for activation o~ a
warning device.
Particularly, U.S.P. 3,4~1,335 utilizes a bi-metallic sensor
which moves in accordance with the temperature on the wheel to
which it is attached to close, respectively, a primary circuit and
a secondary circuit which causes the transmitter to be energized
and emit a signal. Closing of the primary circuit energizes the
transmitter to emit a signal at a given predetermined frequency.
As the temperature sensed increases the bi-metallic sensor causes
the secondary circuit to be closed which energizes a subcarrier
oscillator to modulate the signal and algebraically add the

~3~8443
frequencies of the transmitter si~nal. The receiver at a remote
location from the transmitter accepts the signal and, when only
moderate temperatures have been sensed at the wheel of the vehicle,
the receiver activates a warning light. When excessive
temperatures are encountered the secondary circuit is closed and
the receiver picks up the modulated signal and activates a warning
speaker.
Another example o~ warning or alarm systems for vehicles
includes U.S.P. 3,380,021, which discloses tire pres~ure and wheel
bearing indicators in combination and includes ~eans for indicating
to the operator of the vehicle the tire pressure and wheel bearing
temperature.
All of the prior alternatives, however, require, particularly
in the case of vehicles such as tractor trailers, extensive
modification to the axles to install the device making them
impractical to add on for use with existing vehicles.
Further, in the case of vehicles such as tractor trailers
installation at the time of manufac~ure would not benefit the
operators of the great many tractor trailers presently in use
worldwide. Further, it is the nature of tractor trailer operators
to distrust any apparatus which would require extensive
modification to the vehicle to be installed.
This invention overcomes the disadvantages of the prior art
without requiring, as in the case of tractor trailers, extensive
modification to existing vehicles presently in the marketplace as
will hereinafter become clear upon reading description of the
preferred embodiment of the invention.

13~84a~3
Ob~e~ts of the Invent~on
It is an object of this invention to provide improved
apparatus comprised of at least one transmitter, for emitting a
radio frequency signal upon detection by associated sensors of an
abnormal condition at the location of that sensor, and a monitor,
for receiving the radio frequency signal transmitted and for
providing visual and audio alarms upon reception of such signal.
It is a further object of this invention to provide the
transmitter with a code identifying the location of that
transmitter for a given system.
Further, it is an object of this invention to provide improved
apparatus wherein the transmitter incl~ldes coding means indicating
the type of abnormal condition sensed.
More particularly, the coding means indicating the type of
abnormal condition sensed is combined with the location code for
transmission.
A further object of the invention is to provide improved
apparatus including a monitor and as~ociated transmitters for use
in a vehicle such as a tractor trailer wherein the monitor receives
a coded radio frequency signal emitted from the remotely located
transmitters when the associated sensors of the transmitters detect
an abnormal condition such as low tire pressure, excessive heat
generated by failing wheel bearings, locked or overheated brakes,
or other abnormal conditions caused by malfunctions resulting in
excessive heat, and also excessive vibrations caused by a failed
wheel bearing, a loose lug nut on the wheel, a broken steel belt in

13~8443
the tire, a separation of a recapped tire, or other disturbances
which would give rise to excessive vibration.
Further, this invention is not limited to detecting the
abnormal conditions described but can be utilized in detecting
abnormal conditions which could arise in a failing refrigeration
car of a tractor trailer or a train; it can be utilized in
monitoring temperatures in vans or trailers carrying live stock or
perishable goods.
Further, this invention can be utilized with sensors for
detecting shifting loads in tractor trailers, or a variety of other
conditions, not limited to tractor trailers r wherein temperature,
vibration, electrical voltage, and other conditions are sensed and
coded by a transmitter for transmission to a remote monitor.
Moreover, the improved apparatus meets all of the above
objects without requiring the use of complex circuitry providing
easy use of same in a variety of locations and differing settings.
Fea~ure~ of tha In~ention
It is a feature of the invention to provide warning apparatus
for sensing conditions at a remote source comprising a transmitter
located in the region of the remote source for transmitting a coded
signal, and a monitor for receiving the signal. The transmitter
comprises sensing means responsive to abnormal conditions at the
remote source, coding means for generating the coded signal, and
means for transmitting the signal. The monitor comprises means for
detecting the coded signal, means for decoding the signal received,
and means for indicating the abnormal conditions detected by the
sensing means of the transmitter.

~3~ 43
Further, i-t is a feature of the invention to pro~ide a coded
signal in the form of a coded radio frequency signal.
More particularly, it is a feature of this invention to divide
the coded signal into two parts: the first part identifying the
location of the remote source where the abnormal condition is
sensed, and the second part identifying the type of abnormal
condition sensed.
It is also a feature of this invention for the coding means of
the transmitter to comprise a parallel-to-serial converter.
~till further, it is a feature of this invention for the
decoding means of the monitor to comprise of a serial-to-parallel
converter.
Moreover, it is a feature of this invention for the coding
means of the transmitter unit for generating the coded si~nal to
comprise a data latch circuit.
Finally, it is a feature of this invention for the monitor to
comprise of appropriate audio warning circuits and visual display
circuits to alert the operator of the vehicle of the location and
type of abnormal condition sensed.
Description of the Invention
These and other objects and features will become apparent in
the following description of the preferred embodiment of the
invention to be read in conjunction with the accompanying sheets of
drawings in which:
Figure 1 is a block diagram of the transmitter unit of the
preferred embodiment of the invention;

)84A~3
Figure 2 is a circuit diagram of the activation circuitry o~
the transmitter unit of the preferred embodiment;
Figure 2a is a circuit diagram of the activation circuitry of
the transmitter unit of the preferred embodiment ~or the front
wheel of a vehicle such as a tractor trailer;
Figure 3 is a circuit diagram of the encoding means of the
preferred embodiment of the invention of the transmitter unit;
Figure 4 is a circuit diagram of the transmitting circuit of
the transmitter unit of the preferred embodiment of the invention;
Figure 5 is a block diagram of the monitor of the preferred
embodiment of the invention;
Figure 6 is a circuit di.agram of the radio frequency receiver,
primary oscillator, and filter circuits of the monitor;
Figures 7 and 8 are circuit diagrams of amplifiers, filtersr
and the voltage regulator of the monitor of the preferred
embodiment;
Figure 9 is a circuit diagram of the decoding means of the
monitor;
Figure 10 is a circuit diagram of the display circuits for the
monitor;
Figure 11 is a cross-sectional view of a hub of a drive axle
for the rear of a cab of a vehicle such as tractor trailer showing
various components of the transmitter unit located within the hub
of such axle; and
Figure 12 is a similar view of that shown in Figure 11 for the
front axle or trailer axle of a tractor trailer.

13~8443
According to the invention a typical alarm system of the type
under consideration, particularly for vehicles such as a tractor
trailer, includes a monitor 10, located, as in the preferred
embodiment, in the cab of the vehicle, for receiving a coded radio
frequency signal, and at least one transmitter unit 12 and
associated sensors for transmitting such coded radio frequency
signal upon detecting an abnormal condition such as low tire
pressure, excessive heat generated by failing wheel bearings,
locked or over heated brakes, or abnormal conditions caused by
other malfunctions resulting in excessive heat, and also excessive
vibrations caused by a wheel bearing, loose lug nut on the wheel,
a broken steel belt in the tire, a separation of a recapped tire,
or other disturbances which would give rise to excessive
vibrations.
Detection by any sensor of an abnormal condition activates
transmitter unit 12 to transmit a coded radio frequency signal
lying within the appropriate governmental specifications, and in
the preferred embodiment at appro~imately 20 KHz, for reception by
monitor 10. Monitor 10, upon receiving the signal from transmitter
unit 12, decodes same, as hereinafter explained, and through
appropriate audio and visual indications, alerts the operator of
the vehicle to the problem detected.
In the preferred embodiment transmitter 12, as best
illustrated in block diagram in Figure 1, comprises sensor means
for detecting low tire pressure (outer and inner tire pressure
sensors 14, 16, respectively), excessive heat (heat sensor 18) or
vibration (vibration sensor 20) in the wheel and associated wheel

131~E~443
bearings of the vehicle, such as a tractor trailer, and ~eans 22
for activating transmitter unit 12 upon detection of an abnormal
condition.
The transmitter includes a 9 volt dc power supply 24 and a
means 26 for testing the power level of battery 24 through
depressing plunger 28 and displacing contact 29 from a first
position completing the circuit between leads 25a and 25b to a
second position completing the circuit between leads 27a and 27b;
an audible buzzer 30 is heard upon depressing plunger 28 and
displacing contact 2g to the second position if 9 volt DC power
supply 24 has sufficient charge - indicating successful testing of
the power supply. Testing means 26 is also used as a reset switch
turning the transmitter unit "off" by breaking the circuit upon
displacing contact 29 from the first position between leads 25a and
25b.
Vpon activation of the transmitter unit after the sensors have
detected an abnormal condition a signal is sent from activation
circuitry 22 indicating which of sensors 14, 16, 18, or 20, has
detected an abnormal condition to a Universal Asynchronous
Receiver/Transmitter (UART) circuit 32, such as, in the preferred
embodiment an integrated chip IM6403-lIPL. U~RT circuit 32
combines the sensor code received from activation circuit 22 with
a location code received from dip switch assembly 34 indicating the
location of the particular transmitter unit detecting the abnormal
condition and sends the combined coded signal ~o transmitting
circuit 36 where the signal is transmitted as a coded radio
frequency signal to be picked up by monitor 10 located, as in the

~308443
preferred embodiment, in the cab of the vehicle such as a tractor
trailer: the timing of the transmissions from the transmitting
circuit 36 is controlled by timing circuit 38.
SensQrs 14, 16, 18, and 20, and activation circuit 22 are
detailed in Figure 2. Particularly, sensors 14, 16, 18, and 20,
comprise switches 40, 42~ 44r and 46, respectively, and associated
silicon controlled rectifiers 48, 50~ 52~ and 54~ respectively.
Upon detecting an abnormal condition the appropriate sensor 14, 16,
18, or 20~ closes its respective switch 40, 42~ 44~ or 46 enabling
corresponding silicon controlled rectifier 48, 50~ 52~ or 54~ to
pass 9 volts dc from power supply 24 to voltage regulator circuit
56 which reduces the 9 volt power supply to 5 volts for use by UART
circuit 32. Note that since silicon controlled rectifiers 48, 50~
52, and 54~ are in parallel, activation of any one sensor supplies
the 9 volt power suppl~ to voltage regulator 5 6.
Further, the reduced power supply of 5 volts dc from voltage
regulator circuit 56 is used to power encoder circuit 58 ~ such as,
in the preferred embodiment, integrated circuit 74148, together
with data latch circuit 60 ~ such as, in the preferred embodiment,
integrated circuit 747 5.
Upon closing any one of switches 40, 42, 44 or 46 a 9 volt
signal is supplied to the respective pins 11, 12, 10 or 13 of
encoder circuit 58. Therefore the silicon controlled rectifier
gates supply four bits of parallel data in the form of the presence
or absence of a voltage produced by the closing or remaining open
of respective switches 40, 42~ 44 or 46 upon detection of an
abnormal condition from associated sensors 14 r 16, 18, and 20,

13~8443
respectively. Encoder circuit 58 encodes the four bits of data
into two bits of information, which are in turn latched by data
latch circuit 60.
For example, should switch 44 of sensor 18 be activated its
corresponding line into encoder circuit 58 would be supplied with
9 volts DC from power supply 24. The remaining lines from switches
40, 42, and 46, remain low, ie. 0 volts. These inputs represent
the four bits of data which are encoded, namely, in this example
reading in the order of pins 13, 12, 11, and 10: 0001. Th~ encoder
taXes these four bits of data and converts them to two bits of
binary information, for example 0001 becomes 00. Similarly, if
switch 40, of sensor 14 closes, the four bits of data supplied to
encoder circuit 58 would be represented as 0010. Encoder circuit
58 would then encode this result to the following two bit code:
01~
In the preferred embodiment the following encoding sequence is
used:
SENSOR FOUR BIT I~ATA INPUT TWO BIT DATA OUTPUT
18 0001 00
14 0010 01
16 0100 10
1000 11
Data latch circuit 60 receives the encoded two bits of
information from encoder circuit 58 and retains such coded signal
as long as power is provided from voltage regulator 56.
11

3443
It can be appreciated that by using, in the preferred
embodiment, data latch circuit 60 any short lived data indicating
an abnormal condition will be retained for transmission by
transmitter unit 12 indefinitely, even after the initial sensory
data which activated the particular sensor has been shut off, or is
no longer present. For example, should heat sensor 18 detect
excessive temperatures switch 44 will close resulting in four bits
of parallel data, namely 0001, being read by encoder circuit 58.
The resulting encoded two bit data output, namely 00, is then read
by data latch circuit 60, which in turn, outputs the two bit data
code for transmission. Should sensor 18 no longer detect excessive
heat or, alternatively, should sensor 18 ~burn out" the data
indicating the abnormal conditions may cease to exist. Data latch
circuit 60, however, will continue to output the 00 two bit data
output to UART circuit 32 and transmitting circuit 36 until plunger
28 of reset switch 26 ha~ been depressed separating contact 29 from
leads 25a, 25b, breaking the circui~ and cancelling the power
supply from voltage regulator 56 to data latch circuit 60. This
feature is particularly useful since in tractor trailers excessive
heat generated in a wheel of a vehicle should be investigated even
if the initial sensory data which caused the sensor to activate is
no longer present.
The two bit signal from data latch circuit 60 is then sent to
UART circuit 32 which combines the two bits of sensor information
with a six bit location code for that particular transmitter and
then converts the combined eight bit parallel signal inputted to a
serial data stream for transmitting.

~30~3~43
As best illustrated in Figure 3 UART circuit 32 is s~lpplied
with the six bits of data relating to the location of the
transmitter from dip switch assembly 34 which contains the code
representing the location of the transmitter; the code being preset
at the time of installation of the transmitter. It can be
appreciated that by providing six bits for the code representing
the location of the transmitter up to 64 different locations can be
monitored on the vehicle: monitoring many locations is
particularly important when dealing with vehicles such as tractor
trailers. The two bit data ~rom the detection circuit is combined
with the six bits of data relating to location and the combined
eight bits are transmitted by transmitting circuit 36 to monitor 10
indicating to the operator of the vehicle both the location of the
abnormal condition detected together with the type of abnormal
condition detected.
UART circuit 32 sends the eight bit serial data stream to
transmitting circuit 36 through a NOT-GATE, or, as in the preferred
embodiment, an inverted OR-GATE 62 at such a rate that the entire
eight bit serial data stream is transmitted approximately twice
every second. The timing of the rate of transmission is controlled
by transmit timing circuit 38 which comprises two NOT-GATES or, as
in the preferred em~odiment, inverted OR-GATES 64, 66 in
combination with a suitable capacitance C2, which in the preferred
embodiment the capacitance is approximately 4.7 ~f.
Upon receiving power from voltage regulator 56 transmit timing
circuit 38 outputs a signal to pin 23 of UART circuit 32
approximatel~ twice a second. Upon activation of pin 23 of UART

~3Q8443
circuit 32 by transmit timing circuit 38 pin 25 of the UART circuit
sends to transmitting circuit 36 through a NOT-GATE or, as in the
preferred embodiment, an inverted OR-GATE 62, the eight bit serial
data stream.
S The connections to UART circuit 32 are illustrated in Figure
3 with the two bit data from the detection circuit being connected
to pins 32, 33, and the 6 bits of data relating to location of the
transmitter unit being connected to pins 26, 27, 28, 29, 30, and
31. The timing of UART circuit 32 is provided by a 1 megahertz
crystal oscillator 68 which is connected to pins 17 and 40 of UART
circuit 32.
Transmitting circuit 36 is illustrated in Figure 4. The eight
bit serial data stream is amplified through transistors Q1 and Q2
and then oscilla~ed to a frequency determined by inductance Ll and
capacitance C4 for transmission as a radio frequency signal. It is
noted that by appropriately choosing inductance Ll and capacitance
C4 a radio frequency signal comprising the eight bit serial data
stream can be generated meeting governmental regulations.
The specifications of the various resistors, capacitors,
inductances, and transistors, as utilized in the preferred
embodiment are listed in the following table, however, it should be
realized that these are by no means the only values acceptable to
me~t governmental regulations nor is the invention limited to the
particular sensing means, coding means, timing means, and
transmitting circuit means disclosed.

~3~8~43
COMPONENTS SPECIFICATIONS
-
Rl-15 3K3 1/4 watt 5%
R16 1 Megaohm
R17 10QK
R18 6K2 1/4 watt +~- 5%
Rl9 lK5 1/4 watt +/- 5%
Cl .1 ~f
C2 4.7 ~f electrolytic
C3 3.3 pf +/- .2 pf ceramic
C4 4.7 pf +/- .2 pf ceramic
C5 33 pf +/- 5% ceramic
I,l 2 turns 2mm aluminium ferrite
core
L2 14 turns #22 wire
Ql 2N2222
Q2 PN918
SCR 1-4 C106B
The circuit for monitor 10 is shown in block diagram in Figure
5. In particular, monitor 10 is comprised of a radio frequency
receiver and amplifier circuit 70, for receiving the coded radio
frequency signal transmitted from a transmitter unit 12 upon

~ 3084A3
detecting an abnormal condition, a power regulator circuit 72 for
regulating the voltage required for the components of monitor 10,
a further amplification circuit and filter circuit 74, and a UART
circuit 76 for converting the eight bit serial data stream received
into the original eight bit parallel form of the signal as inputted
to UART circuit 32 of transmitter 12. The eight bit parallel
signal is then split into its original component parts, indicating
which of sensors 14, 16, 18, or 20 detected an abnormal condition
as well as the six bit location code, and then sent to decoders 78,
and 80, 82, respectively, for interpretation by appropriate
circuitry to activate display 84, indicating the type of
malfunction, and display 86, indicating the location of the
transmitter, thereby providing visual warnings of the abnormal
condition detected and the location of the transmitter which
detected such abnormal condition.
In the preferred embodiment display 84 is particularly suited
to indicate which of sensors 14, 16, 18, or 20, detected the
abnormal condition and shows to the operator of the tractor trailer
an appropriate warning of either HEAT t PRESSURE OUTER, PRESSURE
INNER, and VIBRATION; these represent conditions commonly monitored
in tractor trailers. Display 86 can visually resemble a tractor
trailer so that when a particular location is indicated the
operator of the vehicle can immediately identify on the vehicle the
location of the transmitter unit 12 ~hich is currently
transmitting.
Since monitor 10 is preferably located in the cab of a
vehicle, such as a tractor trailer the power supply for monitor 10
16

~ 30~34~3
can be met by the vehicle battery; typically a 12 to 24 volt DC
power source which can be converted to 18 volts DC.
Antenna 88 picks up the coded radio frequency signal
transmitted from the transmitter unit 12 detecting an abnormal
condition starting with the first bit of the 8 bit code, and sends
the signal received to a tuned circuit 92 for filtering out
unwanted frequencies. Tuned circuit 92 is comprised of a variable
tuned capacitor C8 and inductive link L2.
It can be appreciated that for the monitor to read the entire
8 bit code correctly the first bit received should alert the
monitor that a signal has been transmitted; preferably the first
bit should be a 1, since a 0 bit is an ~absence~ of a signal. If
a l bit was not received until, for example, the third bit of the
8 bit code then the monitor will read the code incorrectly,
assuming that the third bit received - the 1 bit - is the first bit
of the code; the preceding 0 bits (really an ~absence" of a signal~
would not be detected.
To ensure that the entire code is correctly read the first bit
of the 8 bit data ~tream outputted from VART 32 of the transmitter
12 is always 0. Upon passing through NOT-GATE, or inverted OR-GATE
62, this bit becomes l. Therefore the ~irst bit of the code
transmitted and received by monitor 10 is 1 - ensuring that monitor
10 receives all 8 bits of the data stream.
Tuned circuit 92 in only allowing the desired frequency to be
received reduces the chances of outside signals interfering with
the signal transmitted ~rom a given transmitter unit 12 located on
the vehicle. In particular, by providing variable tuned capacitor

i308443
C8 the monitor is adaptable to be incorporated into other systems
having a set of transmitters utilizing different frequencies.
Further, tuned circuit 92, in filtering out unwanted
frequencies, leaves the signal received from transmitter unit 12
basically in the form of the serial data stream which was
transmitted.
The signal received through antenna 88 from transmitter unit
12 is sent to primary oscillator and amplification circuit 90 which
comprises transistor Ql, capacitors C2, C3, C4, and C5, and
inductance Ll.
Primary oscillator and amplification circuit 90 amplifies the
received signal to a voltage level usable by the rest of thP
circuitry of monitor 10.
The amplified and filtered signal from tuned circuit 92 and
primary oscillator and amplification circuit 90 is then sent to a
second amplifier circuit 94, best illustrated in Figure 7.
Tn second amplifier circuit 94 the signal is further filtered
through use of capacitors Cll and C12 and again amplified through
use of transistor Q2.
The amplified signal is then sent to a further amplification
circuit 96, as best illustrated in Figure 8. The signal is again
amplified through use of transistor Q3 so that it now is of
sufficient voltage to be read by UART circuit 76, which is
identical to UART circuit 32 of transmitter unit 12, and, in the
preferred embodiment, consists of integrated circuit IM6403-lIPL.
Before the signal is sent to the UART circuit 76, however, it is
first inverted by an inverted AND-GATE 98 which converts the serial
18

~30844~
data stream to the original form outputted by UART circuit 32 of
transmitter unit 12, before such data stream was inverted by
NOT-GATE or inverted OR-GATE 62. Upon passing through amplifier 96
and inverted AND-GATE 98 the serial data stream received is now
substantially identical to that outputted by UAR~ circuit 32 of
transmitter unit 12 and is ready to be sent to UART circuit 76, of
monitor 10.
Voltage regulator 72 is also illustrated in Figure 8, and
reduces the power supply from 18 volts DC to 5 volts DC which is
utilized in powering UART circuit 76 of monitor 10.
The amplified and filtered signal is then sent to UART circuit
76, which is best illustrated in Figure 9. Particularly, the
serial data stream received, filtered, amplified, and inverted, is
passed through serial in port 20 of UART circuit 76 and when the
entire eight bit data stream has been received pin 19 outputs a
signal to one of the two input~ of inverted AND-GATE 102 as well as
activates silicon control rectifier 104. Inverted AND-GATE 102
then combines the input from pin 19 of UART circuit 7 with a 5 volt
DC signal from silicon control rectifier 104. When both inputs to
inverted AND-GATE 102 are high the output of inverted AND-GATE 102
goes low driving pin 18 of UART circuit 76 low allowing UART
circuit 76 to load another eight bits of data received.
UART circuit 76 is timed preferably by a 1 megahertz crystal
oscillator 100 which is connected to pins 17 and 40 of UART circuit
76.
Further, when silicon controlled rectifier 104 is activated
through a signal being outputted by pin 19 of ~ART circuit 76,
19

i30a443
silicon controlled recti~ier 104, in addition to providing a 5 volt
DC output to the second input of inverted AND-GATE 102, also sends
the 5 volt DC power supply to decoders 78, and 80, 82, displays 84,
86, and to audio alarm 106 for producing an audible warning tone
which can only be shut off by pressing reset plunger 108 displacing
contact 109 away from leads llla, lllb and thereby breaking the
circuit.
UART circuit 76 on monitor 10 converts the serial data stream
inputted to pin 20 from serial form to parallel form which is
outputted in parallel form through pins 6, 5, and 12, 11, 10, 9,
8, and 7, respec~ively. The two bit sensor data indicating which
of sensors 14, 16, 18, or 20 of transmitter unit 12 detected a
malfunction is sent through pins 6, 5 to decoder 78, such as an
integrated circuit chip 74I,S138, which activates a visual display
110, comprised of 4 LED's, one for each of sensor 14, 16, 18, and
20l respectively, of transmitter unit 12.
It is to be understood that by appropriately matching each of
the four LED~s of visual di play 110 to a specific sensor, such as
outer tire pressure sensor 14, inner tire pressure sensor 16, heat
sensor 18l and vibration sensor 20, of transmitter unit 12, an
appropriate visual display can be provided of the detected
abnormality.
Similarly, the six bit location data, converted to parallel
output by UART circuit 76, is sent through pins 12, 11, 10, 9, 8,
and 7, to decoder 80, such as an integrated circuit chip 74154, and
decoder 82, such as an integrated chip 74LS138. In particular,
decoder 80 receives four bits of the six bits of location data and

~3~8~43
decodes them so that one output of sixteen possible outputs is
affected. Similarly/ decoder 82 receives the remaining two bits of
the six bits of location data and decodes them so that one output
of four possible outputs is affected. The outputs from decoder 8Q
and decoder 82 are combined in display 86 which comprises an LED
matrix so that one of 64 possible txansmitter locations is
displayed.
The specifications of the various resistors, capacitors,
inductances, and transistors, as utilized in the preferred
embodiment for monitor 10 are listed in the following table,
however, it should be realized that these are by no means the only
values acceptable to meet governmental regulations nor is the
invention limited to the particular receiving means, decoding
means, timing means, and display means disclosed.
COMPONENTS SPECIFICATIONS
R1 lK 1/4 watt 5%
R2 lK5 1/4 watt 5%
R3 4K7 1/ 4 watt 5%
R4 6K2 1/4 watt 5%
R5 750 Ohm 1/4 watt 5%
R6 47K 1/4 watt 5%
R7 10K 1/4 watt 5%
R8 lK 1/4 watt 5%
R9 220K 1/4 watt 5%
R10 5K6 1/4 watt 5%
R11 91K 1/4 watt 5%

~3~84~3
COMPONENTS SPECIFICATIONS
R12 13K 1/4 watt 5%
R13 2K2 1/4 watt 5%
R14 330 Ohm 1/4 watt 5%
R15 3K3 1/4 watt 5%
R16 330 Ohm 1/4 watt 5%
R30 470 Ohm 1/4 watt 5%
C1-3 2pf +/- .2 pf ceramic disk
C4,6 33Pf +/~ 5
C5 .001 mf +/- 10
C7 100pf +/- 10~
C8 Variable Tuner Capacitor
C9 1 mf electrolytic
C10 .01 mf ceramic disk
Cll .001 mf ceramic disk
C12 .022 mf ceramic disk
C13 .0033 mf ceramic disk
. C14 .1 mf ceramic disk
C15 47 mf 160 electrolytic
Ll 14 turns ~22 wire
L2 Inductive link
Q1 PN918
Q2 2N5210
Q3 PN2219

~30~3A43
COMPONENTS SPECIFICATIONS
Q4 2N2~22
SCRl C106B
INS~ALLATION OF T~E TRANSMITTFR
Figure 11 illustrates the placement of the component parts of
the transmitter unit 12 within the drive axle of a vehicle such as
a tractor trailer.
The arrangement illustrated in Figure 11 showing the placement
of the components of the transmitter unit is by no means the only
arrangement used: the important consideration in placing the
components of the transmitter unit 12 within the hub 112 of drive
axle 114 is that they be centrifugally balanced in their
positioning so as not to be damaged during rapid rota~ion of the
drive axle.
Particularly, heat sensor 18 is placed in contact with hub 116
of drive axle 114 to detect any excessive heat generated by failing
bearings 118 within hub 116. Any heat generated by failing wheel
bearings 118 is rapidly transmitted to hub 116 and will readily be
detected by heat sensor 18.
Vibration sensor 20 is axially located upon hub 116 of drive
axle 114 and in such position can readily detect any excessive
~ibrations caused by worn or failed wheel bearin~s, a loose lug nut
on the wheel, a broken steel belt in the tire, a separation of a
recapped tire, or other disturbances which would give rise to
excessive vibration.

~ 3~8443
Leads 120, 122 extend to outer tire pressure sensor 14 and
inner tire pressure sensor 16, respectively, which would he located
on the respective tires (not illustrated) of drive axle 114.
In placing of the component parts of transmitter unit 12 upon
hub 116 of drive axle 114 the parts are encased in foam to reduce
the chance of any accidental dislodgement from their position, and
also to minimize any damage done to them should any dislodgement
occur.
In installing the component parts of transmitter unit 12 hub
cap 112 is removed by pulling outwardly about edges 124, 126,
releasing catches 128, 130, respectively. The component parts of
transmitter unit 12 can then be packed within hub cap 112 for ready
attachment to hub 116 of drive axle 114.
Figure 12 is a similar illustration to Figure 11 showing the
installation of the component parts of transmitter unit 12 within
the trailer or front axle of a vehicle such as a transport trailer.
The main difference in the trailer or front axle of a tractor
trailer to that of the drive axle is the provision of a lubrication
tube 132 in which lu~rication fluid is pumped through oil cap 134
and into cavity 136 of hub 138 of the trailer Gr front axle.
In the case of the front axle only one tire pressure sensor is
required. In this instance an additional vibration sensor 140 can
be provided next adjacent to vibration sensor 20: the purpose of
vibration sensor 140 is to detect momentary increases in vibration
to the front wheel as a result of such wheel leaving the pavement
of the normal road in the event ~he operator of the vehicle looses
24

~30a~43
concentration while driving as occurs, for example, when the driver
sleeps at the wheel.
The configuration of the activation circuitry for the front
wheel utilizing the additLonal vibration sensor 140 is illustrated
in Figure 2a wherein upon activation of vibration sensor 140 switch
42a closes providing po~er to voltage regulator 56a and a signal to
encoder circuit 5~a for transmission to data latch circuit 60a.
The signal detected by vibration sensor 140 is encoded and
transmitted in the regular manner as hereinbefore described except
upon returning of the front wheel to normal pavement ceasing the
temporary abnormal vibration detected switch 42a of vibration
sensor 140 opens breaking the circuit and stopping the power supply
to voltage regulator 56a and ultimately encoder circuit 58a and
data latch circuit 60a. In this manner vibration sensor 140
operates differently from the other sensing means in that once the
abnormal condition which activates the sensor ceases to exist the
transmitter stops transmitting a coded radio frequency signal.
This is desirable since upon returning the vehicle to normal
pavement the operator of a vehicle does not have to stop the
vehicle to manually reset the transmitter unit; rather, upon being
alerted to his lack of concentration the operator through replacing
the vehicle on the appropriatel~ paved surface will "reset" the
transmitter unit.
In the instance where an additional vibration sensor 140 is
provided upon the front axle of the vehicle such as a tractor
trailer an additional indication can be provided to ~onitor 10 in
the cab of the vehicle alerting the driver of the particular

~3~8~43
problem of 108ing concentration at the wheel of the vehicle.
Particularly, an audible warning circuit 142 i6 provided as shown
in dotted outline in Figure 10 and consists of an audible buzzer
144 having a different tone to audible buzzer 106. Audible buzzer
144 is connected through NAND-GATE 146 and inverters 148, 150,
respectively, to lead 152 from decoder 78 and lead 154 from decoder
80. Therefore, upon activation of vibration sensor 140, and upon
picking up the appropriate coded signal and decoding same decoders
78 and 80 upon providing appropriate signals through leads 152 and
154, respectively, energizes audible buzzer 144 alerting the
operator of the vehicle to the drifting of the tractor trailer off
the main pavement.
To discontinue the audible tone heard by buzzer 144 the
operator of the vehicle presses reset plunger 108 displacing
contact 109 from its normal position and breaking the circuit - all
as in the manner de~cribed hereinbefore.
It can appreciated that with modifications to the sensors that
the monitor can efficiently sense any abnormal conditions which
could appear for example, in a refrigeration power plant of a
refrigeration van or trailer, or alternatively, could monitor the
conditions in-vans or trailers covering such things as live stock
or perishable goods.
Other sensors could be provided to monitor things such as oil
pressure for diesel power sources, overheating of such power
sources, or, as in the case of refrigeration units discussed above,
freon pressure.
26
-

13084~3
Further, sensors such as ultra-sound devices could be utilized
to detect shifting loads in tractor trailers alerting the operator
of the vehicle should such a condition arise.
SUPPLEMENTARY DISÇLOSyRF
Figure 13 is a block diagram of a second embodiment of the
transmitter unit of the invention;
Figure 14 is a circuit diagram of the activation circuitry of
the transmitter unit of the second embodiment illustrated in Figure
13;
Figure 14a is a circuit diagram of the activation circuitry of
the transmitter unit of the second embodiment illustrated in Figure
13 for the front wheel of a vehicle such as a tractor trailer;
Figure 15 is a circuit diagram of the encoding means of the
second embodiment of the invention of the transmitter unit;
Figure 16 is a circuit diagram of the transmitting circuit of
the transmitter unit of the second embodiment of the invention;
Figure 17 is a block diagram of a second embodiment of the
monitor of the invention;
Figure 18 is -a circuit diagram of the radio frequency
receiver, primary oscillator, and filter circuits of the monitor of
the second embodiment illustrated in Figure 17;
Figures 19 and 20 are circuit diagrams of amplifiers, filters,
demodulator, and the voltage regulator of the monitor of the second
embodiment;
Figure 21 is a circuit diagram of the decoding means of the
monitor of the second embodiment;

~ 3~84~3
Ac~ording to the second embodiment of the invention
illustrated in Figures 13 to 21, inclusive, a typical alarm system
of the type under consideration, particularly for vehicles such as
a tractor trailer, includes a monitor 10 (all references to the
same elements between the first and second embodiments are
designated ~y like reference characters), located in the cab of the
vehicle, for receiving a coded radio frequency signal, and at least
one transmitter unit 12 and associated sensors for transmitting
such coded radio frequency signal upon detecting an abnormal
condition such as low tire pressure, excessive heat generated by
failing wheel bearings, locked or over heated brakes, or abnormal
conditions caused by other malfunctions resulting in excessive
heat, and also excessive vibrations caused by a wheel bearing,
loose lug nut on the wheel, a broken steel belt in the tire, a
separation of a recapped tire, or other disturbances which would
give rise to excessive vibrations.
Detection by any sensor of an abnormal condition activates
transmitter unit 12 to transmit a coded radio frequency signal
lying within the appropriate governmental specifications, and
preferably at approximately 20 KHz, for reception by monitor 10.
Monitor 10, upon receiving the signal from transmitter unit 12,
decodes same, as hereinafter explained, and through appropriate
audio and visual indications, alerts the operator of the vehicle to
the problem detected.
I~ the second embodiment transmitter 12, as best illustrated
in block diagram in Figure 13, comprises sensor means for detecting
low tire pressure (outer and inner tire pressure sensors 14, 16,

~L3~3~3443
respectively), excessive heat Iheat sensor 18) or vibration
(vibration sensor 20) in the wheel and associated wheel bearings of
the vehicle, such as a tractor trailer, and means 22 for acti~ating
transmitter unit 12 upon detection of an abnormal condition.
The transmitter includes a 9 volt dc power supply 24 and a
means 160 for testing the power level of battery 24 through
depressing plunger 28 and displacing contact 29 from a first
position completing the circuit between leads 25a and 25b to a
second position completing the circuit between leads 27a and 27b;
an audible huzzer 30 is heard upon depressing plunger 28 and
displacing contact 29 to the second position if 9 volt DC power
supply 24 has sufficient charge - indicating successful testing of
the power supply. Testing means 160 is also used as a reset switch
turning the transmitter unit "off" by brea~ing the circuit upon
displacing contact 29 from the first position between leads 25a and
25b.
Upon acti~ation of the transmitter unit after the sensors have
detected an abnormal condition a signal is sent from activation
circuitry 22 indicating which of sensors 14, 16, 18, or 20, has
detected an abnormal condition to a Universal Asynchronous
~eceiver/Transmitter (UART) circuit 32, such as, in the second
embodiment an integrated circuit IM6402IPL. UAR~ circuit 32
combines the sensor code received from activation circuit 22 with
a location code received from dip switch assembly 34 indicating the
location of the particular transmitter uni-t detecting the abnormal
condition and sends the combined coded signal to transmitting
circuit 36 where the signal is transmitted as a coded radio
29

o8~L43
frequency signal to be picked up by monitor 10 located, preferably
in the cab of the vehicle such as a tractor trailer: the timing
of the transmissions from the transmitting circuit 36 is controlled
by timing circuit 38.
Sensors 14~ 16~ 18, and 20, and activation circuit 22 of the
second embodiment are detailed in Figure 14. Particularly, sensors
14, 16, 18, and 20, comprise switches 40, 42, 44, and 46,
respectively, and associated silicon controlled rectifiers 48, 50,
52, and 54, respectively. Upon detecting an abnormal condition the
appropriate sensor 14~ 16, 18, or 20, closes its respective switch
40, 421 44, or 46 enabling corresponding silicon controlled
rectifier 48, 50, 52, or 54, to pass 9 volts dc from power supply
2~ to voltage regulator circuit 56 which reduces the 9 volt power
supply to 5 volts for use by UART circuit 32. Again, since silicon
controlled rectifiers 48, 501 52~ and 54r are in parallel,
activation of any one sensor supplies the 9 volt power supply to
voltage regulato~ 56.
Further, the reduced power supply of 5 volts dc from voltage
regulator circuit 56 is used to power encoder circuit 5B, such as
integrated circuit 74148~ together with data inverter circuit 162,
such as, in the second embodiment, integrated inverter circuit
4049.
Upon closi.ng any one of switches 40~ 42~ 44 or 46 a 9 volt
signal is supplied to the respective pins 9, 11, 7 or 14 O~
inverter circuit 162. Therefore the silicon controlled rectifier
gates supply four bits of parallel data in the form of the presence
or absence of a voltage produced by the closing or remaining open

~308~43
of respective switches 40, 42, 44 or 46 upon detection of an
abnormal condition from associated sensors 14, 16, 18, and 20,
respectively. Encoder circuit 58 encodes the four bits of inverted
data into two bits of information, which are in turn sent to UART
circuit 32.
For example, should switch 44 of sensor 18 be activated its
corresponding line into encoder circuit 58 after passing through
inverter circuit 162 would be supplied with O volts DC from power
supply 24. The remaining lines from switches 40, 42, and 46, are
high, ie. 9 volts DC, after passing through inverter circuit 162.
These inputs represent the four bits of data which are encoded,
namely, in this example reading in the order of pins 13, 12, 11,
and 10: 1110. The encoder takes these four bits of data and
converts them to two bits of binary information, for example 1110
becomes 00. Similarly, if switch 40, of sensor 14 closes, the four
bits of data supplied to encoder circuit 58 after passing through
inverter circuit 162 would be represented as 1101. Encoder circuit
58 would then encode this result to the following two bit code: 01.
In the preferred embodiment the following encoding sequence is
used:
SENSOR FOUR BIT DATA INPUT TWO BIT DATA OUTPUT
18 1110 00
14 1101 01
16 1011 10
~0 0111 11

~3~)8~43
It can be appreciated that encoder circuit 58, in the second
embodiment, can encode, in order of importance, the sensors if more
than one sensor is activated. The sensor priority is 18, 20, 16,
14, meaning that if sensor 18 and sensor 20 are both activated,
sensor 18 will be coded. Also, it can be appreciated that by
using, in the second emhodiment, silicon controlled rectifiers 48,
50, 52 and 54, the first activation of any sensor will power the
transmitter. If the initial abnormality which activated the
particular sensor has been shut off, or is no longer present, power
will remain on indefinitely until the unit is reset by depressing
plunger 28 of reset switch 160 separating contact 29 from leads
25a, 25b, breaking the circuit and cancelling the power supply.
Conse~uently, the first silicon controlled rectifier activated will
continue to keep its input to encoder circuit 58 on~ Further
silicon controlled rectifiers activated after the first one by
their corresponding sensor will shut off if the corresponding
sensor shuts off. For example, if sensor 20 detects excessive
vibration, the encoder circuit 58 codes sensor 20, and ~he
transmitter operates. If the vibration stops, sensor 20 will shut
off, but corresponding silicon controlled rectifier 54 will remain
on, and consequently the encoder circuit 58 will still code sensor
20. Now if sensor 18 senses excessive heat, encoder circuit 58
will now code sensor 18, because it has priority. If heat sensor
18 burns out, encoder circuit 58 will code sensor 20 again, until
the operator resets the unit. This latching-priority method
feature is particularly useful since it allows more important
sensors to take priority, to demand a faster response ~rom the

~308443
operator, and even if the initial sensory data which caused the
transmitter to activate is no longer present, the vehicle must be
stopped, and the problem investigated.
The two bit signal from encoder circuit 58 is then sent to
UA~T circuit 32 which combines the two bits of sensor information
with a six bit location code for that particular transmitter and
then converts the combined eight bit parallel signal inputted to a
serial data stream for transmitting.
As best illustrated in Figure 15 UART circuit 32 is supplied
with the six bits of data relating to the location of the
transmitter from dip switch assembly 34 which contains the code
representing the location of the transmitter; the code being preset
at the time of installation of the transmitter. By providing six
bits for the code representing the location of the transmitter up
to 64 different locations can be monitored on the vehicle. The two
bit data from the detection circuit is combined with the six bits
of data relating to location and the combined eight bits are
transmitted by transmitting circuit 36 to monitor 10 indicating to
the operator of the vehicle both the location of the abnormal
condition detected together with the type of abnormal condition
detected.
UART circuit 32 sends the eight bit serial data stream to
transmitting circuit 36 through, in the second embodiment, a
modulator 164 and an amplifier 166 at such a rate that the entire
eight bit serial data stream is transmitted approximately twice
every second. The timing of the rate of transmission is controlled
by transmit timing circuit 38 which comprises two NOT-GATES 64, 66

8~3
in combination with a suitable capacitance C2, which in the second
embodiment the capacitance is approximately 4.7 ~f.
Upon receiving power from voltage regulator 56 transmit timing
circuit 38 outputs a signal to pin 23 of UART circuit 32
approximately twice a second. Upon activation of pin 23 of UART
circuit 32 by transmit timin~ circuit 38 pin 25 o~ the UA~T circuit
sends to transmitting circuit 36 through, as in the second
embodiment, a modular 164 and an amplifier 166, the eight bit
serial data stream.
The connections to U~RT circuit 32 are illustrated in Figure
15 for the second embodiment, with the two bit data from the
detection circuit being connected to pins 32, 33, and the 6 bits of
data relating to locatiGn of the transmitter unit being connected
to pins 26, 27, 28, 29, 30, and 31. The timing of UART circuit 32
in the second embodiment is provided by a 20 KHz clock generator
168 which is connected to pin 40 of UART circuit 32.
Transmitting circuit 36 for the second embodiment is
illustrated in Figure 16. In particular, the eight bit serial data
stream after modulation and amplification through modulator 164 and
amplifier 166, is then transmitted at resonant frequency determined
by inductance Ll and capacitance C4 for transmission as a radio
frequency signal. It is noted that by appropriately choosing
inductance L1 and capacitance C4 a radio fre~uency signal
comprising the eight bit serial data stream can be generated
meeting governmental regulations.
The specifications of the various resistors, capacitors,
inductances, and transistors, as utilized in the second embodiment
34

~ 308443
ara listed in the following table, however, it should be realized
that these are by no means the only values acceptable to meet
governmental regulations nor is the invention limited to the
particular sensing means, coding means/ timing means, and
transmitting circuit means disclosed.
COMPONENTS SPECIFICATIONS
R1, 9 - 15 3K3 1/4 watt 5%
R2 - 5 47K
R16 1 M
R17 lOOK
R18 6K2
R19 lK5
C1 .1 ~f
C2 4.7 ~f electrolytic
C3 3.3 pf +/- .2 pf ceramic
C4 4.7 pf +/- .2 pf ceramic
C5 33 pf +/- 5~ ceramic
L1 2 turns 2mm aluminium ferrite
core
L2 14 turns #22 wire
Q2 P~918
SCR 1-4 C106B

~3~8443
The circuit for monitor 10 of the second embodiment is shown
in block diagram in Figure 17. In particular, monitor 10 is
compxised of a radio frequency receiver and amplifier circuit 70,
for receiving the coded radio frequency signal transmitted from a
transmitter unit 12 upon detecting an abnormal condition, a power
regulator circuit 72 for regulating the voltage required for the
components of monitor 10, a further amplification circuit and
filter and demodulator circuit 170, and a UART circuit 76 for
converting the eight bit serial data stream received into the
original eight bit parallel form of the signal as inputted to UART
circuit 32 of transmitter 12. The eight bit parallel signal is
then split into its original component parts, indicating which of
sensors 14, 16, 18, or 20 detected an abnormal condition as well as
the six bit location code, and then sent to decoders 78, and 80,
82, respectively, for interpretation by appropriate circuitry to
activate display 84, indicating type of malfunction, and display
86, indicating the location of the transmitter, thereby providing
visual warnings of the abnormal condition detected and the location
of the transmitter which detected such abnormal condition.
Again, monitor 10 is preferably located in the cab of a
vehicle, such a~ a tractor trailer, and the power supply for
monitor 10 can be met by the vehicle battery; typically a 12 to 24
volt DC power source which can be converted to 18 volts DC.
Antenna 88 picks up the coded radio frequency signal
transmitted from the transmitter unit 12 detecting an abnormal
condition and sends the signal received to a tuned circuit 92 for
filtering out unwanted frequencies. Tuned circuit 92 is comprised
36

13~ 3
of a variable tuned capacitor C8 and inductive link L2 as best
illustrated in Figure 18.
Tuned circuit 92 in only allowing the desired frequency to be
received reduces the chances of outside signals interfering with
the signal transmitted from a given transmitter unit 12 located on
the vehicle. In particular, by providing variable tuned capacitor
C8 the monitor is adaptable to be incorporated into other systems
having a set of transmitters utilizing different frequencies.
Further, tuned circuit 92r in filtering out unwanted
frequencies, leaves the signal received from transmitter unit 12
basically in the form of the serial data stream which was
transmitted.
The signal received through antenna 88 from transmitter unit
12 is sent to primary oscilla~or and amplification circuit 90 ~hich
comprises transistor Ql, capacitors C2, C3, C4, and C5, and
inductance Ll.
Primary oscillator and amplification circuit 90 amplifies the
received signal to a voltage le~el usable by the rest of the
circuitry of monitor 10.
The amplified and filtered signal from tuned circuit 92 and
primary oscillator and amplification circuit 90 is then sent to a
second amplifier circuit 94, best illustrated in Figure 19.
In second amplifier circuit 94 the signal is further filtered
through use of capacitors Cll and C12 and again amplified through
use of transistor Q2.
The amplified signal is then sent to a further amplification
circuit 96, as best illu~trated in Figure 20. The signal is again

~3U8~3
amplified through use of transistor Q3 so that it now is of
sufficient voltage ~o be demodulated by demodulator circuit 172.
UART circuit 76, which is identical to UART circuit 32 of
transmitter unit 12 but functioning oppositely to UART circuit 12,
and, in the second embodiment, consists of integrated circuit
IM6402IP~I, receives the demodulated signal. The signal received by
UART circuit 76 is in the original form outputted by UART circuit
32 of transmitter unit 12, before such data stream was modulated by
modulator 164.
Voltage regulator 72 reduces the power supply from 18 volts DC
to 5 volts DC which is utilized in powering UART circuit 76 of
monitor 10.
The amplified, filtered, and modulated signal is then sent to
UART circuit 76, which is best illustrated in Figure 21.
Particularly, the serial data stream received, filtered, amplified,
and demodulated, is passed through serial-in port 20 of UART
circuit 76 and when the entire eight bit data stream has been
received pin 19 outputs a signal to one of the two inputs of
inverted AND-GATE 102 as well as activates silicon control
rectifier 104. Inverted AND-GATE 102 then combines the input from
pin 19 of UART circuit 76 with a 5 volt DC signal from silicon
control rectifiex 104. When both inputs to inverted AND-GATE 102
are high the output of inverted AND-GATE 102 goes low driving pin
18 of UART circuit 76 low allowing UART circuit 76 to load another
eight bits of data received.
38
.

~308~43
UART circuit 76 of the second embodiment is timed preferably
by a 20 XHz clock generator 174 which is connected to pin 17 of
UART circuit 76.
The circuit diagram of the display circuits, and the operation
thereof, is identical in the second embodiment of the invention as
in the first embodiment as illustrated in Figure 10 and described
herein before.
Irhe specifications of the various resistors, capacitors,
inductances, and transistors, as utilized in the second embodiment
for monitor 10 are listed in the following table, however, it
should be realized that these are by no means the only values
acceptable to meet governmental regulations nor is the invention
limited to the particular receiving means, decoding means, timing
means, and display means disclosed.
COMPONENTS SPECIFICATIONS
Rl lK 1/4 watt 5%
R2 lK5 1/4 watt 5%
R3 4K7 1/4 watt 5%
R4 6K2 lJ4 watt 5%
R5 750 Ohm 1/4 watt 5%
R6 47K 1/4 watt 5%
R7 10K 1/4 watt 5
R8 lK 1/4 watt 5%
R9 220K 1/4 watt 5
R10 5K6 1/4 watt 5%
Rll 91K 1/4 watt 5%
39

~308~43
COMPONENTS SPECIFICATIONS
R12 13K 1/4 watt 5%
R13 2K2 1/4 watt 5%
R14 330 Ohm 1/4 watt 5%
R15 3K3 1/4 watt 5%
R16 330 Ohm 1/4 watt 5%
R30 470 Ohm 1/4 watt 5%
Cl-3 2pf +/- .2 pf ceramic disk
C4 r 6 33Pf +/- 5%
C5 .001 mf +/- 10%
C7 100pf +/- 10%
C8 Variable Tuner Capacitor
C9 1 mf electrolytic
C10 .01 mf ceramic disk
Cll .001 mf ceramic disk
C12 .022 mf ceramic disk
C13 .0033 mf ceramic disk
C14 .1 mf ceramic disk
C15 47 mf 160 electrolytic
Ll 14 turns #22 wire
L2 Inductive link
Ql PN918
Q2 2N5210
Q3 PN2219

'1 3g)84L~L3
COMPONENTS SPECIFICATIONS
Q4 2N2222
SCRl C106B
Finally, it will be understood that variations or alternatives
can be introduced or included to the apparatus described and
illustrated by those persons skilled in this field without
departing from the spirit or scope of the invention defined by the
appended claims.
41

Dessin représentatif