JPH0334335U - - Google Patents

Info

Publication number
JPH0334335U
JPH0334335U JP1989094216U JP9421689U JPH0334335U JP H0334335 U JPH0334335 U JP H0334335U JP 1989094216 U JP1989094216 U JP 1989094216U JP 9421689 U JP9421689 U JP 9421689U JP H0334335 U JPH0334335 U JP H0334335U
Authority
JP
Japan
Prior art keywords
overmodulation
output
predetermined time
modulation
voltage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP1989094216U
Other languages
Japanese (ja)
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed filed Critical
Priority to JP1989094216U priority Critical patent/JPH0334335U/ja
Publication of JPH0334335U publication Critical patent/JPH0334335U/ja
Pending legal-status Critical Current

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Landscapes

  • Monitoring And Testing Of Transmission In General (AREA)
  • Transmitters (AREA)

Description

【図面の簡単な説明】[Brief explanation of drawings]

第１図は本考案の実施例を示す回路ブロツク図
、第２図は第１図の各部の波形図である。 １……変調回路、２……搬送波発振器、３……
励振増幅器、４……電力増幅器、５……変調増幅
器、６……検出器、７……アンテナ、８……電力
計、１０……過変調防止回路、１１……緩衝増幅
器、１２……検波器、１３……直流増幅器、１４
……比較器、１５，１６……タイマ、１７……リ
レー、１８……ＡＴＴ。 FIG. 1 is a circuit block diagram showing an embodiment of the present invention, and FIG. 2 is a waveform diagram of each part of FIG. 1. 1...Modulation circuit, 2...Carrier wave oscillator, 3...
Excitation amplifier, 4...Power amplifier, 5...Modulation amplifier, 6...Detector, 7...Antenna, 8...Power meter, 10...Overmodulation prevention circuit, 11...Buffer amplifier, 12...Detection instrument, 13...DC amplifier, 14
... Comparator, 15, 16 ... Timer, 17 ... Relay, 18 ... ATT.

Claims (1)

【実用新案登録請求の範囲】 搬送波を変調回路への変調入力によつて振幅変
調した送信出力をアンテナに供給する大電力放送
機の過変調を一定時間抑えるために、 前記送信出力の一部を検出した検出電圧と予め
定めた前記過変調とならない変調度に相当する基
準電圧とを比較して前記検出電圧が前記基準電圧
を超えたとき前記過変調を示す直流電圧を出力す
る比較器と、 該直流電圧によつてリセツトされたときから前
記一定時間より短い規定時間を超えたとき直流出
力を出力する第１のタイマと、 該直流出力によつて前記一定時間だけの接続時
間を有する駆動出力を出力する第２のタイマと、 前記駆動出力により前記一定時間だけ前記変調
入力を所望の値に減衰させるために前記変調回路
への変調入力に直列に挿入される抵抗減衰器と を備えた大電力放送機の過変調防止回路。[Claims for Utility Model Registration] In order to suppress overmodulation of a high-power broadcasting device that supplies an antenna with a transmission output whose amplitude is modulated by inputting a carrier wave into a modulation circuit, a part of said transmission output is a comparator that compares the detected voltage with a predetermined reference voltage corresponding to a degree of modulation that does not result in overmodulation, and outputs a DC voltage indicating overmodulation when the detected voltage exceeds the reference voltage; a first timer that outputs a DC output when a predetermined time shorter than the predetermined time has elapsed since being reset by the DC voltage; and a drive output having a connection time for the predetermined time by the DC output. and a resistor attenuator inserted in series with the modulation input to the modulation circuit in order to attenuate the modulation input to a desired value for the predetermined time using the drive output Overmodulation prevention circuit for power broadcasters.
JP1989094216U 1989-08-10 1989-08-10 Pending JPH0334335U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1989094216U JPH0334335U (en) 1989-08-10 1989-08-10

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1989094216U JPH0334335U (en) 1989-08-10 1989-08-10

Publications (1)

Publication Number Publication Date
JPH0334335U true JPH0334335U (en) 1991-04-04

Family

ID=31643557

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1989094216U Pending JPH0334335U (en) 1989-08-10 1989-08-10

Country Status (1)

Country Link
JP (1) JPH0334335U (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010051199A (en) * 2008-08-27 2010-03-11 Shimano Inc Flying float with balance function

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54115012A (en) * 1978-02-24 1979-09-07 Rockwell International Corp Rf transmitter
JPS5518849B2 (en) * 1972-11-17 1980-05-22

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5518849B2 (en) * 1972-11-17 1980-05-22
JPS54115012A (en) * 1978-02-24 1979-09-07 Rockwell International Corp Rf transmitter

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010051199A (en) * 2008-08-27 2010-03-11 Shimano Inc Flying float with balance function

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