82 Detent manual varactor tuning system

Details 82 Detent manual varactor tuning system 82 Detent manual varactor tuning system

1976-12-06

1978-03-28

Gensler, Paul L.

Tuners

Tuner unit directly responsive to voltage and/or current...

Reactance tuning

325459, 325465, 358191, H03J 506, H04N 552

Patent

active

040817717

ABSTRACT:
A television tuner system includes a varactor diode as the frequency determining element and means lacking a fine tuning control for addressing the varactor. In the addressing means, a plurality of DC potentials, each defining the band edges of one of the 82 standard broadcast television channels, are selectively accessible for deriving a nominal tuning voltage defining a frequency near the center of a selected channel and a pair of control voltages defining a restricted range of frequencies about the channel center frequency. The nominal tuning voltage is initially supplied to the varactor for tuning to the channel center frequency and is subsequently decoupled therefrom wherein tuning is maintained within the restricted range of frequencies by confining the voltage supplied to the varactor between the pair of control voltages. Automatic frequency control means are used to tune the varactor to a received signal within the restricted range of frequencies.

REFERENCES:
patent: 3753172 (1973-08-01), Sakamoto
patent: 3965427 (1976-06-01), Ma

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