JPS6410737A - Transmitter-receiver - Google Patents

Transmitter-receiver

Info

Publication number
JPS6410737A
JPS6410737A JP16583287A JP16583287A JPS6410737A JP S6410737 A JPS6410737 A JP S6410737A JP 16583287 A JP16583287 A JP 16583287A JP 16583287 A JP16583287 A JP 16583287A JP S6410737 A JPS6410737 A JP S6410737A
Authority
JP
Japan
Prior art keywords
oscillation
control circuit
amplifier
transmitter
gain
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
JP16583287A
Other languages
Japanese (ja)
Inventor
Yoshio Hamada
Seiichi Nasu
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP16583287A priority Critical patent/JPS6410737A/en
Publication of JPS6410737A publication Critical patent/JPS6410737A/en
Pending legal-status Critical Current

Links

Landscapes

  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Radio Relay Systems (AREA)

Abstract

PURPOSE:To always obtain the maximum gain under a state not to oscillate by checking periodically the output noise level of an amplifier, and detecting the presence of oscillation, and controlling a variable attenuator. CONSTITUTION:A transmitter-receiver is provided with a detector 5 to convert an RF signal into a video signal, a comparator 6 to convert the video signal into a quantized video and a control circuit 7 to control a variable attenuator 4 according to the quantized video, and an attenuation quantity control circuit 20 is constituted of the control circuit 7 and the comparator 6. When the transmitter-receiver comes to an oscillating state, the noise of the amplifier 2 is successively amplified, and is detected by the detector 5, and is converted into the video signal. The control circuit 7 checks the presence of the oscillation at every oscillation detecting time, and in case of no oscillation, it increases the gain A by A, and in case of the presence of the oscillation, it decreases the gain B by B. Besides, it is enough for the values A, B to be set as referring to the frequency characteristic of the amplifier 2. Thus, the maximum gain can be always obtained under the state not to oscillate.
JP16583287A 1987-07-02 1987-07-02 Transmitter-receiver Pending JPS6410737A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16583287A JPS6410737A (en) 1987-07-02 1987-07-02 Transmitter-receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16583287A JPS6410737A (en) 1987-07-02 1987-07-02 Transmitter-receiver

Publications (1)

Publication Number Publication Date
JPS6410737A true JPS6410737A (en) 1989-01-13

Family

ID=15819849

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16583287A Pending JPS6410737A (en) 1987-07-02 1987-07-02 Transmitter-receiver

Country Status (1)

Country Link
JP (1) JPS6410737A (en)

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