JPS5574247A - Line monitor system for radio relay line - Google Patents
Line monitor system for radio relay lineInfo
- Publication number
- JPS5574247A JPS5574247A JP14832278A JP14832278A JPS5574247A JP S5574247 A JPS5574247 A JP S5574247A JP 14832278 A JP14832278 A JP 14832278A JP 14832278 A JP14832278 A JP 14832278A JP S5574247 A JPS5574247 A JP S5574247A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- antenna
- output
- detector
- detected
- 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
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
- H04B1/60—Supervising unattended repeaters
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Monitoring And Testing Of Transmission In General (AREA)
Abstract
PURPOSE:To make easy the detection of signal at the lower rank station, by making easy for the insertion of pilot signal at the relay station, through the phase modulation with the second pilot signal having slight frequency difference with the radio pilot frequency for the signal inserted at the direct relay station. CONSTITUTION:The output of the transmitter T is made from the antenna A1 modulated with the radio pilot signal P1. The reception signal from the antenna A2 is added with the phase modulation with the second pilot signal P2 fed to the phase modulator PM, amplified at the amplifier AMP and outputted from the antenna Ao. The electromagnetic waves are inputted from the antenna A4 of the reception station, demodulated at the receiver R, and the signals P1, P2 in the demodulation signal passes through the same BPF, detected with the detector D1 with the envelope detection, and outputted from the output terminal 1. When the level of the signal P2 is made smaller than the signal P1, the disappearence of the signal P1 changes the output from the terminal 1 and the presence of the signal P1 can be detected. Further, the output of the detector D1 is detected with the detector D2 of LPF, allowing to detect the beat of the signals P1 and P2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14832278A JPS5574247A (en) | 1978-11-30 | 1978-11-30 | Line monitor system for radio relay line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14832278A JPS5574247A (en) | 1978-11-30 | 1978-11-30 | Line monitor system for radio relay line |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5574247A true JPS5574247A (en) | 1980-06-04 |
| JPS6228615B2 JPS6228615B2 (en) | 1987-06-22 |
Family
ID=15450184
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14832278A Granted JPS5574247A (en) | 1978-11-30 | 1978-11-30 | Line monitor system for radio relay line |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5574247A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4499600A (en) * | 1980-08-26 | 1985-02-12 | International Standard Electric Corporation | Supervision of transmission systems |
| WO2002067446A1 (en) * | 2001-02-22 | 2002-08-29 | Fujitsu Limited | Superconducting filter device and wireless receiver amplifier |
-
1978
- 1978-11-30 JP JP14832278A patent/JPS5574247A/en active Granted
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4499600A (en) * | 1980-08-26 | 1985-02-12 | International Standard Electric Corporation | Supervision of transmission systems |
| WO2002067446A1 (en) * | 2001-02-22 | 2002-08-29 | Fujitsu Limited | Superconducting filter device and wireless receiver amplifier |
| US7058436B2 (en) | 2001-02-22 | 2006-06-06 | Fujitsu Limited | Superconducting filter apparatus and wireless receiving amplifier having an abnormality discriminating circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6228615B2 (en) | 1987-06-22 |
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