Control circuit for a radio repeater

Details Control circuit for a radio repeater Control circuit for a radio repeater

1977-10-12

1979-04-17

Safourek, Benedict V.

325 64, 179 84VF, H04B 714

Patent

active

041503341

ABSTRACT:
Some radio repeaters receive a voice signal on a first frequency and an information tone signal on a second frequency, and transmit both the voice and tone signals on a third frequency. A circuit is provided to sense the presence of the tone signal and to filter that frequency from the voice signal and also attenuate the remainder of the voice frequencies. The filter prevents the voice signal from interfering with the tone signal, and the attenuator prevents the transmitter modulator from being overloaded, thus providing improved repeater transmission of the tone frequency.

REFERENCES:
patent: 3201524 (1965-08-01), Arseneau
patent: 3387212 (1968-06-01), Kaufman
patent: 3428757 (1969-02-01), Roscoe
patent: 4056780 (1977-11-01), Faulkner

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