JPS59180541U

JPS59180541U - Squelch adjustment circuit

Info

Publication number: JPS59180541U
Application number: JP7406983U
Authority: JP
Inventors: 大塚　章一
Original assignee: 株式会社富士通ゼネラル
Priority date: 1983-05-18
Filing date: 1983-05-18
Publication date: 1984-12-03

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) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of drawings]

第１図は従来のスケルチ調整回路を用いた無線通信機の
ブロック図、第２図は可変抵抗器の特性図、第３図は本
考案によるスケルチ調整回路の−′実施例を示す電気回
路図、第４図、第５図および第６図はそれぞれスケルチ
回路の抵抗を可変して多様に設定した特性図である。１・・・アンテナ、２・・・高周波増幅回路、３・・・
局部発振回路、４・・・混合回路、５・・・中間周波増
幅回路、６・・・弁別回路、７・・・スケルチ回路、８
・・・音声増幅回路、９・・・スピーカ、１０・・・可
変抵抗器、１１・・・入力端子、１２．１３・・・特性
設定用抵抗、１４・・・可動片、１５・・・接続点。Fig. 1 is a block diagram of a wireless communication device using a conventional squelch adjustment circuit, Fig. 2 is a characteristic diagram of a variable resistor, and Fig. 3 is an electric circuit diagram showing an embodiment of the squelch adjustment circuit according to the present invention. , FIG. 4, FIG. 5, and FIG. 6 are characteristic diagrams in which various settings are made by varying the resistance of the squelch circuit. 1... Antenna, 2... High frequency amplification circuit, 3...
Local oscillation circuit, 4... Mixing circuit, 5... Intermediate frequency amplification circuit, 6... Discrimination circuit, 7... Squelch circuit, 8
... Audio amplification circuit, 9 ... Speaker, 10 ... Variable resistor, 11 ... Input terminal, 12.13 ... Characteristic setting resistor, 14 ... Movable piece, 15 ... connection point.

Claims

[Scope of utility model registration request]

(1) In a device in which the squelch operating point is adjusted by varying the resistance value with a movable piece linked to a knob of a variable resistor, at least two resistors for characteristic setting are installed between both ends of the variable resistor. 1. A squelch adjustment circuit comprising: a series circuit connected in series, and a connection point of this characteristic setting resistor connected to a movable piece of the variable resistor.

(2) The squelch adjustment circuit according to claim 1, wherein the two characteristic setting resistors have resistance values ranging from approximately zero to infinity.