Radio communication apparatus free from interference between loc

Details Radio communication apparatus free from interference between loc Radio communication apparatus free from interference between loc

1988-11-07

1989-09-05

Griffin, Robert L.

Telecommunications

Transmitter and receiver at same station

With frequency stabilization

455183, 455255, H04B 140

Patent

active

048646342

ABSTRACT:
A radio communication apparatus capable of carrying out transmission and reception of signals at a time has a frequency synthesizer and a frequency modulator both in novel structures for removing interference between a local signal and a transmission signal. The frequency synthesizer has a local oscillator controlled by a first phase comparator for phase-comparing a frequency divided output of the local oscillator and a reference frequency signal to provide a local signal. The frequency division of the output of the local oscillator is effectd by a first frequency divider for dividing the frequency of the output of the local oscillator and a variable division ratio frequency divider for dividing the frequency of the output of the first frequency divider. The frequency modulator has a transmission oscillator controlled by a second phase comparator for phase-comparing the output of the first frequency divider and a frequency divided output of the transmission oscillator to provide a transmission signal. The frequency division of the output of the transmission oscillator is effected by a second frequency divider.

REFERENCES:
patent: 4397038 (1983-08-01), Rzeszewski
patent: 4520474 (1985-05-01), Vilmur
patent: 4602225 (1986-07-01), Miller et al.
patent: 4618997 (1986-10-01), Imazek et al.
patent: 4631496 (1986-12-01), Borra et al.
patent: 4777655 (1988-10-01), Numata et al.
Manassewitsch, "Frequency Synthesizers Theory and Design," pp. 355-361, 1976.

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