Frequency stabilization circuit for a local oscillator

Details Frequency stabilization circuit for a local oscillator Frequency stabilization circuit for a local oscillator

1979-11-26

1982-09-07

Chin, Tommy P.

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

455264, 455164, 455184, 329122, 331 1R, 331 18, H04B 116

Patent

active

043487726

ABSTRACT:
The numbers of cycles in a received signal including Doppler frequency spread are counted (36) modulo a base value much smaller than the number of cycles in such received signal during a predetermined measuring interval for thereby averaging out the effects of such frequency spread in the counter output. That output is utilized to control the frequency of a local oscillator (26) to lock it to the frequency of the received signals. The actual duration of the measuring interval is set (39) in accordance with a signal provided from the oscillator. Also shown are circuits (45, 23) for causing the oscillator initially to lock to a radio system master reference frequency and thereafter to lock, in a narrow frequency band, to a pilot frequency of a specified information channel.

REFERENCES:
patent: 3346814 (1967-10-01), Haggai
patent: 3370252 (1968-02-01), Zoerner
patent: 3922609 (1975-11-01), Grohmann
patent: 3983501 (1976-09-01), Lindstrum
patent: 4004232 (1977-01-01), Amaya
patent: 4048581 (1977-09-01), Lyberg
patent: 4161698 (1979-07-01), Klank
patent: 4175254 (1979-11-01), Manfreda
Low Noise Frequency Synthesizer Design For UHF Communication System, By E. Kather, pp. 7B-1 to 7B-5, IEEE Conference on Communications, 1974.

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