Tuning apparatus using a voltage-dependent reactance element

Details Tuning apparatus using a voltage-dependent reactance element Tuning apparatus using a voltage-dependent reactance element

1975-02-20

1977-06-21

Chatmon, Jr., Saxfield

Tuners

Tuner unit directly responsive to voltage and/or current...

Reactance tuning

325452, 325458, 325465, 334 11, 334 16, H03H 512, H03J 306, H03J 504

Patent

active

040314910

ABSTRACT:
A tuning apparatus using a voltage-dependent reactance element comprising a tuning circuit including a voltage-dependent reactance element as a tuning element, a voltage sweep circuit for generating a sweep tuning voltage to be applied to the voltage-dependent reactance element, an operational circuit for converting the tuning voltage to a reference voltage which linearly varies in proportion with a tuning frequency and a voltage comparator circuit for comparing an output of the operational circuit with a predetermined standard voltage, an output of the voltage comparator circuit being used to control the sweep of the voltage sweep circuit to produce a predetermined tuning frequency.

REFERENCES:
patent: 3117293 (1964-01-01), Mortley
patent: 3495195 (1970-02-01), Ribour
patent: 3588706 (1971-06-01), Sakai et al.
patent: 3614666 (1971-10-01), Ribour et al.
patent: 3641463 (1972-02-01), Perks
patent: 3651411 (1972-03-01), Zlotnick
patent: 3657654 (1972-04-01), Friberg
patent: 3679990 (1972-07-01), Hiday et al.
patent: 3748645 (1973-07-01), Kawashima
patent: 3846707 (1974-11-01), Sakamoto et al.
patent: 3868609 (1975-02-01), Koyangi
patent: 3882400 (1975-05-01), Hamada
patent: 3895303 (1975-07-01), Imazeki et al.

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