Automatic frequency control circuitry

Details Automatic frequency control circuitry Automatic frequency control circuitry

1976-01-16

1984-03-06

Blum, Theodore M.

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

H04B 116

Patent

active

044358474

ABSTRACT:
Automatic control circuitry for maintaining the frequency of a first local oscillator in a radar receiver at a predetermined offset frequency with respect to the frequency of either transmitted signals from a radar transmitter or echo signals from a target is disclosed. The disclosed circuitry operates as a discriminator when the frequency of the first local oscillator is different from the predetermined offset frequency and as a "phase lock" loop when the frequency of the first local oscillator is the same as the predetermined offset frequency.

REFERENCES:
patent: 3594651 (1971-07-01), Wolejsza, Jr.
patent: 3818347 (1974-06-01), Holsinger
patent: 3938148 (1976-02-01), Hobson

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