Multichannel radio transmitter with means to prevent abnormal wa

Details Multichannel radio transmitter with means to prevent abnormal wa Multichannel radio transmitter with means to prevent abnormal wa

1975-12-22

1977-07-12

Griffin, Robert L.

325 17, 325 25, 325174, 325176, H04B 104

Patent

active

040357279

ABSTRACT:
A multichannel transmitter incorporating a phase-locked loop frequency synthesizer to generate a carrier signal of a selected radio frequency, which carrier is subsequently amplified, modulated, and radiated into space. In order to prevent abnormal radiation which would take place as when the PLL frequency synthesizer is switched from one transmission channel to another, a transmission stopper circuit is connected to the output of the phase comparator or detector of the synthesizer so as to be actuated thereby when the desired phase or frequency lock is not established in the synthesizer. When actuated, the transmission stopper circuit prevents the wave radiation of the transmitter, as by causing nonconduction through a transistor provided therein. The invention is disclosed as adapted for a transceiver.

REFERENCES:
patent: 2845536 (1958-07-01), Goldstein
patent: 2958768 (1960-11-01), Brauer
patent: 3146398 (1964-08-01), Schnadelbach
patent: 3413554 (1968-11-01), Yates et al.
patent: 3641434 (1972-02-01), Yates et al.
patent: 3882424 (1975-05-01), DeBois et al.

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