High frequency channel selecting circuit for radio receiver and

Details High frequency channel selecting circuit for radio receiver and High frequency channel selecting circuit for radio receiver and

1996-07-25

1999-05-18

Tung, Bryan

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

4551911, 4551912, 4551501, 4551781, 4551871, H04B1/16

Patent

active

059059486

ABSTRACT:
A therefor method of manufacturing tuning circuits for constituting a high frequency channel selecting circuit for a radio receiver. The method can eliminate the complicated coil inductance adjustment for tracking on the circuit board, so that the circuit elements can be arranged freely without any interference between the tuning circuits. The variable capacitance diodes (D1, D2; D3, D4; D5, D6) and fixed capacitances (C1; C4; C7) are classified; a fixed capacitance is selected according to a ranking of capacitance value of the variable capacitance diodes, to obtain a variable capacitance range or a ratio (C.sub.max /C.sub.min) determined for each tuning circuit; and the inductance of a coil (L1; L2; L3) of each tuning circuit is adjusted in such a way that tracking error can be eliminated on the basis of one common tuning voltage, before the tuning circuits are mounted on the circuit board.

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patent: 5203031 (1993-04-01), Sugayama
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Patent Abstracts of Japan, E-854, Dec. 5, 1989, vol. 13/No. 541.
Translation of Office Action issued on Feb. 12, 1998.

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