Telecommunications – Transmitter and receiver at same station – With frequency stabilization
Patent
1981-10-26
1983-09-13
Ng, Jin F.
Telecommunications
Transmitter and receiver at same station
With frequency stabilization
455 77, H04B 140
Patent
active
044046855
ABSTRACT:
An improved frequency control system for radio apparatus is provided, which is especially advantageous for employment in portable, battery powered, multichannel, radio transceivers.The system involves both individual and combinational type improvements relating to the constructional and operational aspects of transceiver equipment. Some salient features of the system include digital frequency synthesizer circuitry having a frequency and phase locked loop employing a voltage controlled oscillator, out-of-band selection detecting and transmit inhibit signal generating circuitry, and filtering and amplifying circuitry employing voltage controlled tuning and improved wide-band inter-stage coupling for supplying frequency controlling signals for both a receiver and a transmitter from a common excitation source.
REFERENCES:
patent: 3696422 (1972-10-01), Burrell
patent: 4035727 (1977-07-01), Ishii
patent: 4162447 (1979-07-01), Teshirogi et al.
patent: 4186343 (1980-01-01), Kakigi
patent: 4247951 (1981-01-01), Hattori et al.
patent: 4254504 (1981-03-01), Lewis
"Synthesized FM Transceiver-1" by Forrester, Wireless World, Nov. 1977, vol. 83, #1503.
Ng Jin F.
Terra Corporation
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