Automatic AFT defeat circuit

Details Automatic AFT defeat circuit Automatic AFT defeat circuit

1979-09-17

1980-11-18

Ng, Jin F.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455182, 455192, H04B 116

Patent

active

042349621

ABSTRACT:
A manual AFT switch and a manual FINE TUNE switch are configured so that whenever the FINE TUNE switch is engaged the AFT detector output is automatically disconnected from the AFT input of a tuning voltage control circuit. Furthermore a loading circuit coupled to the AFT input and driven by either the AFT switch or FINE TUNE switch assures the desired impedance at the AFT input whenever the output of the AFT detector is so disconnected.
Automatically defeating the AFT circuit during manual fine tuning tends to optimize fine tuning by eliminating a component of correction voltage contributed by the AFT system, a face of which the lay viewer is likely to be unaware.

REFERENCES:
patent: 3440544 (1969-04-01), Pampel
patent: 3705356 (1972-12-01), Russell
patent: 3750028 (1973-07-01), Uchida
patent: 3939427 (1976-02-01), Mueller

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