1974-10-15
1976-03-02
Safourek, Benedict V.
325464, H04B 116
Patent
active
039421228
ABSTRACT:
A multiband tuner control system, particularly adapted for television receivers, utilizes, a three-band varactor VHF tuner. The bands include low and high band VHF signals and a third band of signals obtained from the UHF signals following a first conversion to a third VHF frequency band. This third band is selectively switched to the tuner under the control of channel selection switches. The channel selection switches also cause the conversion of UHF signals to the VHF band to be effected by mixing the UHF signals with a different fixed frequency local oscillator signal in the first converter for each different decade of channels of the UHF signal. The channel selection switches automatically cause this to happen and also select a proper tuning potentiometer associated with the selected UHF or VHF band directly in accordance with the two-digit channel number. The switching of the bands of the tuner is effected automatically by the channel selection switches, as is the switching between the VHF input signals and the converted UHF signals.
REFERENCES:
patent: 2785297 (1957-03-01), Scandurra
patent: 3568112 (1971-02-01), Thomas
patent: 3693091 (1972-09-01), Russell
Ptak LaValle D.
Quasar Electronics Corporation
Safourek Benedict V.
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