JPS54101215A - Heterodyne relay unit of hot standby type - Google Patents

Heterodyne relay unit of hot standby type

Info

Publication number
JPS54101215A
JPS54101215A JP798778A JP798778A JPS54101215A JP S54101215 A JPS54101215 A JP S54101215A JP 798778 A JP798778 A JP 798778A JP 798778 A JP798778 A JP 798778A JP S54101215 A JPS54101215 A JP S54101215A
Authority
JP
Japan
Prior art keywords
selector
output
relay unit
intermediate frequency
hot standby
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
JP798778A
Other languages
Japanese (ja)
Inventor
Yoshio Ito
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 JP798778A priority Critical patent/JPS54101215A/en
Publication of JPS54101215A publication Critical patent/JPS54101215A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/74—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission for increasing reliability, e.g. using redundant or spare channels or apparatus

Landscapes

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

Abstract

PURPOSE:To realize the control of selector with a simple circuit by performing the selection of the hot standby relay unit with the intermediate frequency section easy to operate with a simple circuit constitution and making unnecessary the high frequency selector for high output for the selection of the transmitter. CONSTITUTION:Two receivers supply the output of the local oscillators 4, 10 via the reception branch filters 2, 9 from the antennas 1, 8, and the output reaches the intermediate frequency selector 7 via the reception frequency converters 3, 12. The input signal of the selector 7 compared 6 and the signal of high level of either one is branched with the next branch circuit 13. This branched output is amplified 20, 21 after being converted 15, 18 into transmission wave via the intermediate frequency selectors 14 and 17. Either one of the outputs of the amplifiers 20 and 21 is delivered from the transmission antennas 26 and 17 via the transmission branch filters 24 and 25.
JP798778A 1978-01-26 1978-01-26 Heterodyne relay unit of hot standby type Pending JPS54101215A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP798778A JPS54101215A (en) 1978-01-26 1978-01-26 Heterodyne relay unit of hot standby type

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP798778A JPS54101215A (en) 1978-01-26 1978-01-26 Heterodyne relay unit of hot standby type

Publications (1)

Publication Number Publication Date
JPS54101215A true JPS54101215A (en) 1979-08-09

Family

ID=11680765

Family Applications (1)

Application Number Title Priority Date Filing Date
JP798778A Pending JPS54101215A (en) 1978-01-26 1978-01-26 Heterodyne relay unit of hot standby type

Country Status (1)

Country Link
JP (1) JPS54101215A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2020127114A (en) * 2019-02-04 2020-08-20 株式会社日立国際電気 Fm relay transmission device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2020127114A (en) * 2019-02-04 2020-08-20 株式会社日立国際電気 Fm relay transmission device

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