Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1980-02-07
1981-05-26
Ng, Jin F.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
455180, 334 15, H04B 116
Patent
active
042702186
ABSTRACT:
Disclosed is a UHF-VHF combination channel selector for use with varactor diode tuners in which varactor control voltage is provided by a plurality of tapered potentiometers covering the various tuning segments. Non-detent, continuous channel selection is provided by rotation of a single control shaft to which is coupled a potentiometer wiper assembly. A substantially linear tuner control angular displacement versus channel number displacement over both frequency bands is achieved by compensating for varactor tuner nonlinearity over the VHF-band with complementary VHF selector potentiometers while hyper abrupt junction varactor diode manufacturing tolerances are compensated for by normalization of the UHF selector by means of upper and lower band tapered potentiometers. Selector circuitry including the various potentiometers and associated resistors forming voltage divider networks is in substrate form on one side of the selector board while band select switching is provided on the other side of the selector board.
REFERENCES:
patent: Re29786 (1978-09-01), Weigel
patent: 3707877 (1973-01-01), Kondo
patent: 3715495 (1973-02-01), Takezaki
patent: 3906373 (1975-09-01), Hendrickson
patent: 3942122 (1976-03-01), Nakanishi
patent: 3962643 (1976-06-01), Ma
patent: 3965427 (1976-06-01), Ma
Chin Tommy P.
Hill Thomas E.
Ng Jin F.
Zenith Radio Corporation
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