The synthesizer uses phase lock loop techniques to generate either the carrier signal for an associated transmitter or the injection signal for an associated receiver. A programmable divider controls the specific channel to which the synthesizer tunes the transmitter or receiver whereas operation in the transmit or receive mode is dependent upon which of two oscillators is coupled in the synthesizer circuit. The oscillators are designed to run at two frequencies having a difference equal to the intermediate frequency of the receiver. This allows the one output from the synthesizer to be used in both the transmit and receive modes.
申请公布号
US4061973(A)
申请公布日期
1977.12.06
申请号
US19760670296
申请日期
1976.03.25
申请人
MOTOROLA, INC.
发明人
REIMERS, FRED ALAN;BECKMANN, ROBERT MARTIN;BURZYNSKI, WILLIAM ARTHUR;TOMLINSON, DENNIS EUGENE;SCHWARTZ, WILLIAM HENRY