JPS5485627A - Multi-frequency direct-shift repeating installation - Google Patents

Multi-frequency direct-shift repeating installation

Info

Publication number
JPS5485627A
JPS5485627A JP15391677A JP15391677A JPS5485627A JP S5485627 A JPS5485627 A JP S5485627A JP 15391677 A JP15391677 A JP 15391677A JP 15391677 A JP15391677 A JP 15391677A JP S5485627 A JPS5485627 A JP S5485627A
Authority
JP
Japan
Prior art keywords
frequency
oscillator
circuit
carrier
prescribed
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
JP15391677A
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 JP15391677A priority Critical patent/JPS5485627A/en
Publication of JPS5485627A publication Critical patent/JPS5485627A/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 save the packing space as well as to simplify the circuit constitution by providing the variable frequency socillator to each circuit for the sharing purpose in the repeating installation in which the carrier is inserted again via the carrier inserting oscillator when the reception level lowers less than the prescribed level. CONSTITUTION:The multi-frequency signals received through antenna 8 are amplified by receiver 1, 1' and 1'' of each circuit and then applied to circulator 4 via switch 2. And the transmission frequency which is deviated by the deviation frequency compared with the reception frequency via the output of deviation frequency oscillator 6 is obtained at diviation frequency converter 5 to be transmitted through antenna 9 and via transmitter 7, 7' and 7''. At the same time, when the reception level lowers less than the prescribed level, the output of carrier inserting oscillator 10, which can vary the frequency of oscillator 12 to the prescribed frequency of each circuit via controller 11, is switched by switch 2 and then applied to circulator 4 to be then supplied to transmitter 7, 7' and 7'' each in the form of the transmission frequency.
JP15391677A 1977-12-20 1977-12-20 Multi-frequency direct-shift repeating installation Pending JPS5485627A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15391677A JPS5485627A (en) 1977-12-20 1977-12-20 Multi-frequency direct-shift repeating installation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15391677A JPS5485627A (en) 1977-12-20 1977-12-20 Multi-frequency direct-shift repeating installation

Publications (1)

Publication Number Publication Date
JPS5485627A true JPS5485627A (en) 1979-07-07

Family

ID=15572893

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15391677A Pending JPS5485627A (en) 1977-12-20 1977-12-20 Multi-frequency direct-shift repeating installation

Country Status (1)

Country Link
JP (1) JPS5485627A (en)

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