1974-06-03
1976-05-18
Libman, George H.
325468, H04B 134
Patent
active
039581802
ABSTRACT:
A varactor tuner frequency controller wherein a tuning voltage is developed for optimumly tuning a VHF tuner or a UHF tuner to any one of a plurality of channels. A capacitor utilized to store charge for developing the tuning voltage is discharged by means of a pulse developed by a monostable circuit which is gated by a bandswitch reset pulse. Charging of the capacitor is provided for by a positive current source which supplies a substantially constant current to the capacitor in the absence of a hold signal, the hold signal only being present when a selected channel has been reached. In the presence of a hold signal, the current supplied by the positive current source is modified in accordance with an automatic fine tuning signal, and a negative current source supplies a substantially constant current to the capacitor approximately equal to the current supplied by the positive current source in the absence of the hold signal to effect a stopping of the sweep. When irregular spaced channels are being tuned, the negative current source is momentarily disabled in the presence of a hold signal to provide for an incremental sweep of the tuning voltage to place the tuning voltage within a range which will provide for proper automatic fine tuning operation.
REFERENCES:
patent: 3259851 (1966-07-01), Brauer
patent: 3818353 (1974-06-01), Sakamoto
patent: 3846707 (1974-11-01), Sakamoto
patent: 3857107 (1974-12-01), Lieberman et al.
Libman George H.
RCA Corporation
Whitacre Eugene M.
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