AM Radio having an automatic fine tuning circuit

Details AM Radio having an automatic fine tuning circuit AM Radio having an automatic fine tuning circuit

1981-03-04

1983-05-10

Bookbinder, Marc E.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455192, 455197, H04B 116

Patent

active

043833330

ABSTRACT:
An AM superheterodyne radio receiver has an RF filter which includes a biased varactor for providing a trimming capacitance and provides an AGC signal when it is tuned to a broadcast AM signal. The AGC signal and a derived time derivative signal are used to provide binary signals which drive a logic circuit and the logic circuit controls a generator which biases the varactor. The biased varactor fine tunes the RF filter towards the carrier frequency of the broadcast AM signal.

REFERENCES:
patent: 2516856 (1950-08-01), Cowles
patent: 2791685 (1957-05-01), Hill et al.
patent: 3447087 (1969-05-01), Takezaki et al.
patent: 3495195 (1970-02-01), Ribour
patent: 4004231 (1977-01-01), Elshuber

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