Telecommunications – Transmitter and receiver at separate stations – Having measuring – testing – or monitoring of system or part
Patent
1987-09-10
1989-05-23
Griffin, Robert L.
Telecommunications
Transmitter and receiver at separate stations
Having measuring, testing, or monitoring of system or part
455 88, 455229, 455 98, H04B 1700, H04B 144
Patent
active
048337250
ABSTRACT:
A system for detecting unintentional operation of a radio transmitter includes an antenna for receiving a r.f. signal and a detector for detecting the absence of presence of a component in the received signal that is indicative of a transmission from a radio transmitter keyed in an operating condition but not being used. In response to detection of such signal component, the detector produces a trigger signal. A delay timer times the duration of the trigger sigal and produces a delayed signal in response to the duration of the trigger signal exceeding a preset time period. An indication circuit produces an operator-alerting indication in response to receipt of the delayed signal informing the operator that the transmitter is unintentionally keyed in an "on" condition. The system also has a d.c. power source for supplying power to the detector, delay timer and indication circuit to operate the same. A power source voltage level monitor is coupled between the power source and the indication circuit for producing an actuating signal in response to depletion of the power source below a predetermined power level. The indication circuit is operable to produce another operator-alerting indication in response to receipt of the actuating signal informing the operator that the power supply is low. The system further includes a circuit for switching the power source between operative and inoperative conditions in response to detection of a rate of change in ambient background noise level exceeding respective positive and negative preset rates.
REFERENCES:
patent: 2280421 (1941-01-01), Chappell et al.
patent: 3588858 (1971-06-01), Demuth
patent: 4197497 (1980-04-01), Phelps
patent: 4331953 (1982-05-01), Blevins et al.
patent: 4335468 (1982-06-01), Foster et al.
patent: 4506073 (1986-08-01), Moore
patent: 4593273 (1986-06-01), Narcisse
Griffin Robert L.
Smith Ralph E.
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