Delayed response transmitter indicator

Details Delayed response transmitter indicator Delayed response transmitter indicator

1976-06-29

1978-06-06

Griffin, Robert L.

325 64, H04B 106

Patent

active

040939200

ABSTRACT:
A broad band wave detection system which responds to no signal versus any signal with a resettable indicator which responds only after a pre-determined period of time. The system has a crystal detector coupled to a chopper, an AC amplifier, a detector which is coupled to a level detector and a time delay to actuate an indicator driver to produce a visual or aural signal. The system indicates the presence of an RF signal which has remained constant for a pre-set period of time and re-sets to zero time on removal of the RF signal.

REFERENCES:
patent: 2512078 (1950-06-01), Wehner
patent: 3256515 (1966-06-01), Caprio
patent: 3613010 (1971-10-01), Podolski et al.
patent: 3634768 (1972-01-01), Carpenter et al.

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