JPS58111541U

JPS58111541U - Receiver antenna circuit

Info

Publication number: JPS58111541U
Application number: JP916682U
Authority: JP
Inventors: 三好　一秀
Original assignee: 富士通テン株式会社
Priority date: 1982-01-25
Filing date: 1982-01-25
Publication date: 1983-07-29
Also published as: JPS6338589Y2

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of drawings]

第１図は先行技術の電気回路図、第２図は本考案の一実
施例の電気回路図である。１・・・アンテナ、３・・・第１コイル、４．５・・・
第２　　　　“コイル、８．９．１０．１２・・・コン
デンサ、１３゜１４．１？、１８，２４，２５，２６，
３７゜３Ｂ、４４．４５・・・スイッチングダイオード
、５１・・・高周波増幅回路、５２・・・局部発振回路
、５３・・・中間周波増幅回路、８１・・・切換えスイ
ッチ、８２・・・共通接点、８３・・・第１個別接点、
８４・・・第２ａｍ＋Ｊ接点、８７・・・スイッチング
トランジスタ、６９・・・スイッチ、７０・・・共通接
点、７１．　７２・・・個別接点。FIG. 1 is an electrical circuit diagram of the prior art, and FIG. 2 is an electrical circuit diagram of an embodiment of the present invention. 1... Antenna, 3... First coil, 4.5...
2nd “Coil, 8.9.10.12... Capacitor, 13°14.1?, 18, 24, 25, 26,
37゜3B, 44.45... Switching diode, 51... High frequency amplifier circuit, 52... Local oscillation circuit, 53... Intermediate frequency amplifier circuit, 81... Changeover switch, 82... Common Contact, 83...first individual contact,
84... 2nd am+J contact, 87... switching transistor, 69... switch, 70... common contact, 71. 72...Individual contact.

Claims

[Scope of utility model registration request]

(1) A first coil, a second coil connected in series to the first coil, and a capacitor receive a signal in the first frequency band from the antenna in tune with the first coil. In an antenna circuit of a receiver configured to receive a signal in a second frequency band higher than one frequency band in synchronization with a first coil and the capacitor, a common contact and first and second individual contacts are provided. a common contact is connected to a terminal of the first coil opposite to the antenna, a first individual contact is connected to one terminal of the second coil, and a second individual contact is connected to the capacitor. , a switching transistor is connected between the other terminal of the second coil and the capacitor, and when the common contact of the changeover switch conducts to the first individual contact, the transistor conducts, and when the common contact conducts to the second individual contact. A receiver disconnection circuit characterized by a transistor blocking the circuit.

(2) the receiver is of a superheterologin type;
A constant of at least one of an inductor, a capacitance element, and a capacitance element included in the resonant circuit of the local oscillation circuit is changed by the action of a switching diode connected to the switch operated in conjunction with the changeover switch,
2. The receiver antenna circuit according to claim 1, wherein the base of the switching transistor is connected to the interlocking switch.