JPS56125123A - Direct relay device - Google Patents
Direct relay deviceInfo
- Publication number
- JPS56125123A JPS56125123A JP2849780A JP2849780A JPS56125123A JP S56125123 A JPS56125123 A JP S56125123A JP 2849780 A JP2849780 A JP 2849780A JP 2849780 A JP2849780 A JP 2849780A JP S56125123 A JPS56125123 A JP S56125123A
- Authority
- JP
- Japan
- Prior art keywords
- reception
- level
- frequency
- difference
- amplifier
- 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
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/155—Ground-based stations
- H04B7/15528—Control of operation parameters of a relay station to exploit the physical medium
- H04B7/15542—Selecting at relay station its transmit and receive resources
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Radio Relay Systems (AREA)
Abstract
PURPOSE:To enble to detect the reception input electric field, by using the detector for the difference between reception and transmission frequency, and a diode mixer. CONSTITUTION:After the signal inputted from a reception input terminal 1 is amplified at an amplifier A1, it is inputted to the amplifier A1 again via a filter and a frequency converter M. Thus, the reception and transmission signals appear at the output of the amplifier A1. When the two signals are inputted to a diode mixer D1, the frequency difference component between the reception/transmission frequencies is caused, and the level is proportional to the level difference of two waves. Thus, the level of frequency difference is porportional to the reception input electric field, the frequency component is picked up at the filter F5 and the level is detected with a detector DET, allowing to obtain an output corresponding to the received electric field at the terminal 3.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2849780A JPS56125123A (en) | 1980-03-06 | 1980-03-06 | Direct relay device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2849780A JPS56125123A (en) | 1980-03-06 | 1980-03-06 | Direct relay device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS56125123A true JPS56125123A (en) | 1981-10-01 |
Family
ID=12250303
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2849780A Pending JPS56125123A (en) | 1980-03-06 | 1980-03-06 | Direct relay device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS56125123A (en) |
-
1980
- 1980-03-06 JP JP2849780A patent/JPS56125123A/en active Pending
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