Single frequency signalling in a radiotelephone communication sy

Details Single frequency signalling in a radiotelephone communication sy Single frequency signalling in a radiotelephone communication sy

1975-06-27

1976-03-23

Griffin, Robert L.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

179 41A, 325 2, 325 5, 325 15, 343177, H04M 716, H04M 320, H04B 138

Patent

active

039463150

ABSTRACT:
Single frequency signaling system which simulates the low level tone during the idle circuit condition even though the radio frequency carriers in the transmission link through a repeater have been turned off. Said system utilizes 2600 Hz detectors having long time constants to turn the transmitters on and off and to connect 2600 Hz oscillators to the receive lines to simulate the idle circuit condition.

REFERENCES:
patent: 2607887 (1952-08-01), Gissler et al.
patent: 3209258 (1965-09-01), Collins, Jr. et al.
patent: 3292087 (1966-12-01), Carver
patent: 3377435 (1968-04-01), Lippert
patent: 3428899 (1969-02-01), Sekimoto
patent: 3458664 (1969-07-01), Adlhoch et al.
patent: 3517312 (1970-06-01), Yamato et al.
patent: 3555424 (1971-01-01), Malm
patent: 3571519 (1971-03-01), Tsimbidis
patent: 3688195 (1972-08-01), Muller

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