VHF Television tuner circuit with supression of undesired signal

Details VHF Television tuner circuit with supression of undesired signal VHF Television tuner circuit with supression of undesired signal

1978-05-30

1980-06-10

Smith, Alfred E.

Tuners

Combined diverse-type tuners

334 85, H03J 500

Patent

active

042075491

ABSTRACT:
A VHF television tuner circuit is adapted for selecting a channel from a plurality of VHF television channels and a UHF/VHF converted television channel, by mechanical selection to form a resonant circuit having electrical characteristics corresponding to the selected channel. The tuner circuit is coupled to a VHF television signal terminal and a UHF/VHF converted television signal terminal. The tuner circuit comprises a channel selection means including a first switch and a second switch each comprising movable contacts fixedly positioned on a channel selection shaft and stationary contacts corresponding to the selectable channel positions and positioned in proximity to the movable contacts for coaction therewith. The first switch comprises a movable/stationary contact combination positioned in the vicinity of the VHF television signal terminal and responsive to selection of the UHF/VHF converted channel position for being grounded for electrostatically shielding the VHF television signal terminal. The second switch comprises a movable/stationary contact combination responsive to selection of the UHF/VHF converted channel position for connecting the UHF/VHF converted television signal terminal to the radio frequency amplifier.

REFERENCES:
patent: 3571723 (1971-03-01), Ogusu
patent: 4025857 (1977-05-01), Miura
patent: 4112378 (1978-09-01), Ito et al.
patent: 4128820 (1978-12-01), Krepps, Jr.

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