H - Electricity – 04 – N
Patent
H - Electricity
04
N
365/12, 350/94
H04N 5/44 (2006.01) H03J 3/18 (2006.01) H04B 1/18 (2006.01)
Patent
CA 1058747
ABSTRACT OF THE DISCLOSURE: The present invention relates to an input circuit of a VHF of a television set tuner and includes first and second induc- tive elements connected in series with each other and in parallel with a varactor, forming a resonance circuit with the varactor for selecting a desired lower channel from an incoming television si- gnal. The second inductive element has at least one tap connected to the following stage for transmitting signals of the desired low- er channel. A third inductive element is connected to a junction of the first and the second inductive elements and connected in series with the first inductive element and forming therewith a parallel resonance circuit with the varactor for selecting a desired higher channel from the incoming television signal. A first switching cir- cuit is interposed between the junction and the following stage and being operable to conduct for transmitting the desired higher chan- nel therethrough to the following stage. A capacitor is connected in series with the third inductive element and forming a wave trap therewith. A second switching circuit is interposed between the junction and the wave trap and being rendered conductive when re- ceiving the desired higher channel for passing the same, and the first and the second switching circuits being rendered non-conduc- tive when receiving the desired lower channel.
235733
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