Multi-channel R.F. transducer with channel selector coupled to s

Details Multi-channel R.F. transducer with channel selector coupled to s Multi-channel R.F. transducer with channel selector coupled to s

1976-04-30

1977-05-24

Safourek, Benedict V.

325171, H04B 104

Patent

active

040258556

ABSTRACT:
A voltage variable filter circuit useful, for example, in a radio frequency transmitting device and having a center frequency which is changeable with changes in an applied voltage employs one or more voltage variable reactive elements in the filter in conjunction with circuitry for changing the direct current voltage across such reactive elements to change the reactance thereof and therefore also change the center frequency of the filter. To extend the range of filter variation, additional reactance may be selectively introduced into the filter circuit. In the environment of a multi-channel radio frequency transmitting device, a selector switch simultaneously selects one radio frequency channel for transmission and a unique voltage source for application to the voltage variable reactance so that the filter is appropriately tuned for the selected channel.

REFERENCES:
patent: 2712061 (1955-06-01), McClellan
patent: 3095539 (1963-06-01), Bennett et al.
patent: 3129386 (1964-04-01), Daly
patent: 3413554 (1968-11-01), Yates et al.

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