VHF tuner device

Details VHF tuner device VHF tuner device

1972-07-11

1977-10-04

Safourek, Benedict V.

325378, 325454, H04B 118

Patent

active

040526747

ABSTRACT:
An input device for a tuner utilizing as an amplifier element a bipolar transistor or tetrode metal-oxide-semiconductor field-effect transistor is provided in which an impedance means is connected in parallel with an impedance of an antenna; a capacitor means is inserted between the input terminal of the amplifier element and a group of tuning coils or inductance means for selecting the television channels in the high frequency band when a channel in the high frequency band is selected whereas an inductance means is inserted between the input terminal and a group of tuning coils for selecting the channels in the low frequency band when a channel in the low frequency band is selected; and an impedance means is inserted between the input terminal of the amplifier element and the earth. The tuning frequency band widths or selectivities in both the high and low frequency bands may be made substantially equal without causing the loss due to the impedance mismatching even when the input impedance of the amplifier element varies greatly in response to the change in frequency.

REFERENCES:
patent: 2798955 (1957-07-01), Balash
patent: 3036212 (1962-05-01), Meyer et al.
patent: 3328701 (1967-06-01), Rieth
patent: 3333202 (1967-07-01), Valdettaro

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