JPS6410737A - Transmitter-receiver - Google Patents
Transmitter-receiverInfo
- 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
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.
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) |
-
1987
- 1987-07-02 JP JP16583287A patent/JPS6410737A/en active Pending
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