JPS5550757A - Signal change-over control device - Google Patents

Signal change-over control device

Info

Publication number
JPS5550757A
JPS5550757A JP12257878A JP12257878A JPS5550757A JP S5550757 A JPS5550757 A JP S5550757A JP 12257878 A JP12257878 A JP 12257878A JP 12257878 A JP12257878 A JP 12257878A JP S5550757 A JPS5550757 A JP S5550757A
Authority
JP
Japan
Prior art keywords
station
circuit
synchronous signal
antenna
repeater
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
JP12257878A
Other languages
Japanese (ja)
Inventor
Akihisa Inagaki
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.)
Hitachi Denshi KK
Original Assignee
Hitachi Denshi KK
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 Hitachi Denshi KK filed Critical Hitachi Denshi KK
Priority to JP12257878A priority Critical patent/JPS5550757A/en
Publication of JPS5550757A publication Critical patent/JPS5550757A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L7/00—Arrangements for synchronising receiver with transmitter
    • H04L7/0079—Receiver details
    • H04L7/0083—Receiver details taking measures against momentary loss of synchronisation, e.g. inhibiting the synchronisation, using idle words or using redundant clocks

Landscapes

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

Abstract

PURPOSE:To use the circuit between the repeater circuit and the grandchild station even when the synchronous signal cannot be received by providing a change-over circuit in which the relay controlled by the synchronous signal from the parent station and the isolator in the repeater station of the multi-direction multiplex radio circuits. CONSTITUTION:The synchronous signal included in the radio wave of the parent station from the antenna 1 is taken out by the filter 7, amplified 8 and controls the relay 9. When the relay 9 receives the synchronous signal, the contacts 17, 18 are connected and when the synchronous signal disappears due to the deterioration in circuit condition such as fading, the contacts 19, 20 are connected. Between the contacts 19 and 20, the isolator 21 is connected, the input signal from the antenna 1 passes, the output signal to the antenna 1 directed to the parent station is checked, whereas the transmission output is supplied to the antenna 2 directed to the grandchild. Even if the transmission synchronous signal from the parent station cannot be received by the repeater station, the circuit between the repeater station and the grandchild station can be used without applying interference to other station because of pull out and the circuit can be employed effectively.
JP12257878A 1978-10-06 1978-10-06 Signal change-over control device Pending JPS5550757A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12257878A JPS5550757A (en) 1978-10-06 1978-10-06 Signal change-over control device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12257878A JPS5550757A (en) 1978-10-06 1978-10-06 Signal change-over control device

Publications (1)

Publication Number Publication Date
JPS5550757A true JPS5550757A (en) 1980-04-12

Family

ID=14839368

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12257878A Pending JPS5550757A (en) 1978-10-06 1978-10-06 Signal change-over control device

Country Status (1)

Country Link
JP (1) JPS5550757A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58151994A (en) * 1982-03-02 1983-09-09 Nippon Steel Weld Prod & Eng Co Ltd Flux cored wire for arc welding
JPS61212483A (en) * 1985-03-19 1986-09-20 Nippon Steel Corp Production of two phase stainless welding pipe having excellent corrosion resistance

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58151994A (en) * 1982-03-02 1983-09-09 Nippon Steel Weld Prod & Eng Co Ltd Flux cored wire for arc welding
JPH0234716B2 (en) * 1982-03-02 1990-08-06 Nippon Steel Welding Prod Eng
JPS61212483A (en) * 1985-03-19 1986-09-20 Nippon Steel Corp Production of two phase stainless welding pipe having excellent corrosion resistance
JPH0333071B2 (en) * 1985-03-19 1991-05-15 Nippon Steel Corp

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