Unintentional radio transmission detection system

Telecommunications – Transmitter and receiver at separate stations – Having measuring – testing – or monitoring of system or part

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Details

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

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