Automatic turn-off apparatus for a radio or television receiver

Details Automatic turn-off apparatus for a radio or television receiver Automatic turn-off apparatus for a radio or television receiver

H - Electricity

03

J

365/5, 325/71

H03J 3/00 (2006.01) H03J 7/06 (2006.01) H04B 1/16 (2006.01)

Patent

CA 1145402

-19- RCA 73,456 ABSTRACT OF THE DISCLOSURE A television receiver includes a tuning system comprising a phase locked loop (PLL) configuration and an automatic fine tuning (AFT) configuration which are selectively enabled to operate in response to respective levels of a MODE signal to tune standard and nonstandard frequency RF carriers. In the absence of an RF carrier for a selected channel, the operations of PLL and AFT configurations are alternately enabled and the level of the MODE signal changes accordingly. The MODE signal is applied to a capacitor which develops a control voltage for turning the receiver "off" after the MODE signal has changed levels for a predetermined time because of the absence of a RF carrier.

358606

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