Digital radio system capable of high-speed frequency changing at

Details Digital radio system capable of high-speed frequency changing at Digital radio system capable of high-speed frequency changing at

1995-08-21

1997-02-11

Eisenzopf, Reinhard J.

Telecommunications

Transmitter and receiver at same station

With frequency stabilization

455 86, 455260, 329325, 331 22, 332127, H04B 150

Patent

active

056030975

ABSTRACT:
The output frequency of a PLL frequency synthesizer and the output frequency of a fixed oscillator are mixed together in a mixer to produce sum and difference frequencies. The sum frequency is used as a local frequency, and the difference frequency is fed back to the PLL frequency synthesizer. In addition, the output frequency of the fixed oscillator is divided in a predetermined ratio to use it as a local frequency for the second or other subsequent frequency converting stage on the receiver or transmitter side.

REFERENCES:
patent: 4063173 (1977-12-01), Nelson et al.
patent: 4086545 (1978-04-01), Teshigori
patent: 5020093 (1991-05-01), Pireh
patent: 5276915 (1994-01-01), Marko et al.

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