Very high frequency tuner for eliminating image interference and

Details Very high frequency tuner for eliminating image interference and Very high frequency tuner for eliminating image interference and

1977-03-07

1979-08-14

Griffin, Robert L.

325377, 325387, 325437, 325439, 325490, H04B 110

Patent

active

041647106

ABSTRACT:
A very high frequency tuner for selection of a broadcasting signal through mechanical switching selection of inductance coils, comprising a radio frequency amplifying transistor of an automatic gain control type connected to amplify a high frequency signal, a single tuned coupling circuit coupled to said high frequency amplifying transistor for selectively withdrawing a tuned high frequency signal, a local oscillator for providing a local oscillation frequency signal the frequency of which is different by a given frequency difference from the said selectively withdrawn tuned high frequency signal, a mixer responsive to the tuned high frequency signal from the tuned coupling circuit and the local oscillation frequency signal for providing an intermediate frequency signal, an automatic gain control signal source for applying the automatic gain control signal to the high frequency amplifying transistor, said transistor having a stray capacitance at the output thereof, said single tuned coupling circuit comprising a .pi.type single tuned coupling circuit comprising mechanically selected coil arranged in a series fashion between the output of the high frequency amplifying transistor and the input of the mixer, an input capacitor connected to the input terminal of the selected inductance coil in a shunt manner and a second capacitor connected to the output terminal of the inductance coil in a shunt manner, wherebysaid stray capacitance being shunted by said input capacitor.

REFERENCES:
patent: 1831640 (1931-11-01), Roberts
patent: 2514357 (1950-07-01), Burgett
patent: 2581159 (1952-01-01), Achenbach
patent: 2790035 (1957-04-01), Hylas et al.
patent: 3207990 (1965-09-01), Nestlerodz
patent: 3305784 (1967-02-01), Chalmers et al.
patent: 3441865 (1969-04-01), Siwko

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