Idle-busy signalling between telephone system and radiophone sys

Details Idle-busy signalling between telephone system and radiophone sys Idle-busy signalling between telephone system and radiophone sys

1977-09-06

1979-02-06

Cooper, William C.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

325 5, 343177, H04M 700, H04M 322, H04B 138

Patent

active

041385950

ABSTRACT:
An interface unit for use between a telephone system in which a single-frequency tone is transmitted in both directions when the circuit is on-hook (idle) and a single-channel-per-carrier radio system in which the radio frequency carrier is not transmitted when the circuit is idle. A transmitting portion includes a single-frequency tone detector means responsive to termination or initiation of the tone from the telephone system to turn on the radio frequency carrier. A receiving portion includes a radio frequency carrier detector means operative to switch the telephone system from the output of a local single frequency local oscillator to a voice frequency line from the radio system, and a single frequency detection means to switch the telephone system back to the output of the local single frequency oscillator.

REFERENCES:
patent: 2773977 (1956-12-01), Hale
patent: 3105881 (1963-10-01), Maurushat
patent: 3946315 (1976-03-01), Tustison

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