Telecommunications – Transmitter and receiver at same station – With a common signal processing stage
Patent
1981-11-23
1984-05-22
Ng, Jin F.
Telecommunications
Transmitter and receiver at same station
With a common signal processing stage
455 83, H04B 140
Patent
active
044505833
ABSTRACT:
A multi-channel transceiver uses a single high-stability crystal to generate a signal that is multiplied to a frequency near a desired transmitting and receiving frequency. The multiplied frequency is mixed with the output of an offset oscillator having a frequency selected so that the sum or difference of the two frequencies is a desired transmission frequency and the other of the sum or difference is an appropriate frequency for a local oscillator. The offset oscillator may use crystals of lower frequency stability than that of the single high-stability crystal.
REFERENCES:
patent: 2889452 (1959-06-01), Bartley
patent: 3300720 (1967-01-01), Kowols
patent: 3825830 (1974-07-01), O'Connor
patent: 4231116 (1980-10-01), Sekiguchi et al.
"Servicing Synthesizers", Radio Electronics, pp. 61-65, Mar. 1978.
Lunquist Richard E.
Rihani Jawdat
Strobel Russell A.
Gillman James W.
Motorola Inc.
Ng Jin F.
Southard Donald B.
Warren Charles L.
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