JPS5485625A - Direct-shift repeating installation - Google Patents

Direct-shift repeating installation

Info

Publication number
JPS5485625A
JPS5485625A JP15391377A JP15391377A JPS5485625A JP S5485625 A JPS5485625 A JP S5485625A JP 15391377 A JP15391377 A JP 15391377A JP 15391377 A JP15391377 A JP 15391377A JP S5485625 A JPS5485625 A JP S5485625A
Authority
JP
Japan
Prior art keywords
frequency
output
oscillator
amplifier
converter
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
JP15391377A
Other languages
Japanese (ja)
Inventor
Yuji Kitahara
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 JP15391377A priority Critical patent/JPS5485625A/en
Publication of JPS5485625A publication Critical patent/JPS5485625A/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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Radio Relay Systems (AREA)

Abstract

PURPOSE:To use the element of the 200 - 300 MHz both to the oscillator and the switch with omission of the microwave band element, and thus to obtain a repeating installation which excels in the reliability and the economical property. CONSTITUTION:Receiver 1 is installed to amplify the reception signal of frequency fR, along with last microwave amplifier 2 plus deviation frequency converter 3 to form the transmission signal of frequency fT from the output of amplifier 2. Also, switch 10 operating on control signal C formed from the reception signal is added to select the output of deviation frequency oscillator 8 to oscillate the difference of the frequencies between the transmission and the reception. And the output of oscillator 8 is applied to converter 3 and then mixed with the output of amplifier 2 to be supplied to power amplifier 5 via filter 4. In case the level of the reception input point is less than the prescribed level, the frequency of deviation frequency oscillator 12 is selected and then given the n-multiplication via converter 3 to generate transmission frequency fT.
JP15391377A 1977-12-20 1977-12-20 Direct-shift repeating installation Pending JPS5485625A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15391377A JPS5485625A (en) 1977-12-20 1977-12-20 Direct-shift repeating installation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15391377A JPS5485625A (en) 1977-12-20 1977-12-20 Direct-shift repeating installation

Publications (1)

Publication Number Publication Date
JPS5485625A true JPS5485625A (en) 1979-07-07

Family

ID=15572832

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15391377A Pending JPS5485625A (en) 1977-12-20 1977-12-20 Direct-shift repeating installation

Country Status (1)

Country Link
JP (1) JPS5485625A (en)

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