Research/Patents/US 4435847
US 4435847

AUTOMATIC FREQUENCY CONTROL CIRCUITRY

Assignee

Filed

Jan 16, 1976

Granted

Mar 6, 1984

Location

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.

Source: Google Patents

35 USC §181 Secrecy Order

Imposed

Apr 30, 1982

Rescinded

May 27, 1983

Duration

1 year

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Back to patent indexSource: USPTO 35 USC §181 secrecy order records