Method and apparatus for frequency stabilization of a down conve

Details Method and apparatus for frequency stabilization of a down conve Method and apparatus for frequency stabilization of a down conve

1989-11-30

1991-09-03

Eisenzopf, Reinhard J.

Telecommunications

Receiver or analog modulated signal frequency converter

Noise or interference elimination

455316, 455317, 342358, 364421, H04B 126

Patent

active

050461354

ABSTRACT:
A method and apparatus is disclosed for automatic elimination of frequency instabilities in a receiver frequency converter. Such instabilities result from temperature variations and mechanical vibrations of the local oscillator of a first stage converter. A marker signal is introduced into the first stage down converter mixer and is subjected to the same variations in frequency conversion as is the received signal from an antenna. Intermediate down converted received signals and an intermediate down converted marker signal are received by a second stage converter where such signals are applied to a mixer, the output of which is free of frequency variations introduced by the local oscillator of the first stage converter.

REFERENCES:
patent: 3124799 (1964-06-01), Hagedorn et al.
patent: 4408352 (1983-10-01), Dudding
patent: 4918748 (1990-04-01), Shahriary et al.
patent: 4928315 (1990-05-01), Jensen et al.

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