Radio receiver

Details Radio receiver Radio receiver

1975-12-23

1977-10-11

Griffin, Robert L.

Tuners

Tuner unit with electromagnetic operator

Predetermined center frequency selector

325453, 325465, 334 15, H04B 134

Patent

active

040538389

ABSTRACT:
The tuning circuit of an automatically tuned radio receiver comprises a semiconductor variable capacitance element and is supplied with control voltage from a voltage memory element. The voltage memory element is controlled in the polarity of input voltage and feeding time by a search control circuit and thereby its output voltage level varies upward or downward until the tuning circuit tunes to the selected broadcasting frequency. When the tuning circuit tunes to the broadcasting frequency, the search operation is suspended and the receiver is in the receiving condition. During this time, the voltage memory element stably maintains the output voltage memorized at the tuning period. The voltage memory element is controlled by the AFC voltage during the receiving condition and operates as an element of the AFC loop.

REFERENCES:
patent: 3467870 (1969-09-01), Aoyama
patent: 3588706 (1971-06-01), Sakai et al.
patent: 3742362 (1973-06-01), Meurer et al.
patent: 3818353 (1974-06-01), Sakamoto

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