JPS56125123A - Direct relay device - Google Patents

Direct relay device

Info

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
Application number
JP2849780A
Other languages
Japanese (ja)
Inventor
Osamu Yamamoto
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 JP2849780A priority Critical patent/JPS56125123A/en
Publication of JPS56125123A publication Critical patent/JPS56125123A/en
Pending legal-status Critical Current

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.
JP2849780A 1980-03-06 1980-03-06 Direct relay device Pending JPS56125123A (en)

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)

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