JPS57206134A - Protecting device of transmission tube - Google Patents

Protecting device of transmission tube

Info

Publication number
JPS57206134A
JPS57206134A JP9203581A JP9203581A JPS57206134A JP S57206134 A JPS57206134 A JP S57206134A JP 9203581 A JP9203581 A JP 9203581A JP 9203581 A JP9203581 A JP 9203581A JP S57206134 A JPS57206134 A JP S57206134A
Authority
JP
Japan
Prior art keywords
transmission tube
signal
transmission
discontinued
working
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.)
Granted
Application number
JP9203581A
Other languages
Japanese (ja)
Other versions
JPH023571B2 (en
Inventor
Masanobu Hasegawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric Co Ltd
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 by NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP9203581A priority Critical patent/JPS57206134A/en
Publication of JPS57206134A publication Critical patent/JPS57206134A/en
Publication of JPH023571B2 publication Critical patent/JPH023571B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/02—Transmitters
    • H04B1/04—Circuits
    • H04B1/0466—Fault detection or indication

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Transmitters (AREA)

Abstract

PURPOSE:To detect an abnormal operation and to avoid the breakdown of a transmission tube, by extracting a part of the output signal of the transmission tube and discontinuing the working of the transmission tube when the undesired signal caused by the abnormal oscillation, etc. exceeds the comparison reference level. CONSTITUTION:The output of a transmission tube 1 is delivered via a directional coupler 5 and a transmission/reception switch 4. The signal extracted by the coupler 5 is fed to a filter 6 which transmits only the undesired frequency component and then converted into a video signal through a wave detector 7. The output signal of the detector 7 is compared with the comparison reference level through a comparator 8. A deciding circuit 9 decides whether the transmitting operating should be discontinued or not. This decision cuts the supply of a trigger signal to a modulator 2 by a gate circuit 10. Thus the working is discontinued for a transmitting device.
JP9203581A 1981-06-15 1981-06-15 Protecting device of transmission tube Granted JPS57206134A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9203581A JPS57206134A (en) 1981-06-15 1981-06-15 Protecting device of transmission tube

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9203581A JPS57206134A (en) 1981-06-15 1981-06-15 Protecting device of transmission tube

Publications (2)

Publication Number Publication Date
JPS57206134A true JPS57206134A (en) 1982-12-17
JPH023571B2 JPH023571B2 (en) 1990-01-24

Family

ID=14043265

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9203581A Granted JPS57206134A (en) 1981-06-15 1981-06-15 Protecting device of transmission tube

Country Status (1)

Country Link
JP (1) JPS57206134A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014022940A (en) * 2012-07-18 2014-02-03 Nec Access Technica Ltd Control device, control method, and control program
JP2014225792A (en) * 2013-05-16 2014-12-04 株式会社東芝 Amplifier

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50128408A (en) * 1974-03-28 1975-10-09

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50128408A (en) * 1974-03-28 1975-10-09

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014022940A (en) * 2012-07-18 2014-02-03 Nec Access Technica Ltd Control device, control method, and control program
JP2014225792A (en) * 2013-05-16 2014-12-04 株式会社東芝 Amplifier

Also Published As

Publication number Publication date
JPH023571B2 (en) 1990-01-24

Similar Documents

Publication Publication Date Title
JPS6468050A (en) Mobile station equipment for land mobile radio telephone
JPS57206134A (en) Protecting device of transmission tube
HK69695A (en) Self-tuning low frequency phase shift coin examination method and apparatus
JPS57141106A (en) Sweep signal generator
JPS5672541A (en) Step-out detection circuit
MY106795A (en) Stability detection method and apparatus for a tuning system.
JPS56117437A (en) Pll circuit
JPS6449370A (en) Facsimile equipment
JPS57204605A (en) Transducer
JPS5595860A (en) Ultrasonic flaw detector
JPS5654179A (en) Automatic monitoring method for television picture
JPS5410402A (en) Protection device for recycling pump
JPS5631612A (en) Detector for performance of chip disposal
JPS57178427A (en) Monitoring circuit for oscillator output
JPS5364969A (en) Safety apparatus for hydroextractor
JPS54121945A (en) Inspection circuit for carrier protective relay
GB575432A (en) Improvements in terminal apparatus for electric signalling systems
JPS5635218A (en) Monorail type golf cart
JPS55123244A (en) Microwave repeater
JPS56128469A (en) Radar device
JPS5442915A (en) Local oscillation circuit for automatic sweep receiver
JPS5364971A (en) Safety apparatus for hydroextractor
JPS5450940A (en) Load controller for indoor power line carrier
JPS553274A (en) Multi-band automatic channel selection radio receiver
Vinod et al. Optimum dwell time determination for RF immunity test