JPS5765028A - Hot stand-by type radio relay system - Google Patents

Hot stand-by type radio relay system

Info

Publication number
JPS5765028A
JPS5765028A JP14161280A JP14161280A JPS5765028A JP S5765028 A JPS5765028 A JP S5765028A JP 14161280 A JP14161280 A JP 14161280A JP 14161280 A JP14161280 A JP 14161280A JP S5765028 A JPS5765028 A JP S5765028A
Authority
JP
Japan
Prior art keywords
signal
frequency
receivers
transmission
relay system
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
JP14161280A
Other languages
Japanese (ja)
Inventor
Yasuo Yajima
Hideo Kaneoka
Kazuoki Kinoshita
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP14161280A priority Critical patent/JPS5765028A/en
Publication of JPS5765028A publication Critical patent/JPS5765028A/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

Abstract

PURPOSE:To reduce power consumption and to make the maintenance easy by making an FM modulator and a demodulator unnecessary, through the connection of transmission and reception systems with an IF signal. CONSTITUTION:An RF signal received at an antenna 23 is branched at a high- frequency brancher 1 and introduced to receivers 2'', 2'''. Only desired RF signal is picked up at a high frequency BPF3 and it is applied to a frequency converter 5 together with the signal from an oscillator 4 to be converted into an IF signal, which is applied to an IF amplifier 7 via an IF band pass filter 6 and amplified to a prescribed level. The IF signal in the desired RF signal is outputted from the IF amplifier at the receiver 2''', the IF signal from the receivers 2'', 2''' is applied to transmitters 12'', 12''', it is synthesized with the signal from an oscillator 17 at a transmission frequency converter 16 and converted into an RF signal, and the desired RF signal is applied to a transmission RF switch 22 via a high-frequency BPF18. The switch 22 is controlled with detected output of detectors 25, 20 of the receivers 2'', 2''' and the transmitters 12'', 12'''.
JP14161280A 1980-10-09 1980-10-09 Hot stand-by type radio relay system Pending JPS5765028A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14161280A JPS5765028A (en) 1980-10-09 1980-10-09 Hot stand-by type radio relay system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14161280A JPS5765028A (en) 1980-10-09 1980-10-09 Hot stand-by type radio relay system

Publications (1)

Publication Number Publication Date
JPS5765028A true JPS5765028A (en) 1982-04-20

Family

ID=15296069

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14161280A Pending JPS5765028A (en) 1980-10-09 1980-10-09 Hot stand-by type radio relay system

Country Status (1)

Country Link
JP (1) JPS5765028A (en)

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