Telecommunications – Transmitter and receiver at same station – With frequency stabilization
Patent
1986-03-26
1989-09-26
Griffin, Robert L.
Telecommunications
Transmitter and receiver at same station
With frequency stabilization
455 62, 455 67, 455115, 455125, H04B 140
Patent
active
048706990
ABSTRACT:
The operating frequency of a radio transceiver and at least one further variable operating parameter of the radio transceiver are controlled in accordance with pre-stored information. Transmit operating radio frequency information is stored in a memory together with associated optimum modulation deviation level information (e.g., so as to maintain a predetermined modulation level at each operating frequency). Receive operating radio frequency information is similarly stored in the memory along with information indicating whether microprocessor clock oscillator frequency is to be shifted (e.g., so as to avoid spurious interfering harmonics emanating from the clock). When operating in the transmit mode, pre-stored modulation gain level information associated with the selected transmit frequency controls the gain of the modulator circuits to compensate for expected changes in modulator circuit gain with change in transmit radio frequency. In the receive mode, the microprocessor clock oscillator frequency may be shifted in accordance with the selected receive frequency, thereby automatically shifting harmonics of the microprocessor clock oscillator out of the receiver bandpass when necessary to avoid locally-generated signals from interfering with signal reception.
REFERENCES:
patent: 4189689 (1980-02-01), Triplett
patent: 4254504 (1981-03-01), Lewis et al.
patent: 4282497 (1981-08-01), Hulbert
patent: 4373206 (1983-02-01), Suzuki et al.
patent: 4404685 (1983-09-01), Rogers
patent: 4484355 (1984-11-01), Henke et al.
patent: 4543661 (1985-02-01), Defeuilly et al.
Garner Terry N.
Sherman Ralph R.
General Electric Company
Griffin Robert L.
Kuntz Curtis
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