JPS57159140A - Frequency shift type in repeater - Google Patents

Frequency shift type in repeater

Info

Publication number
JPS57159140A
JPS57159140A JP4452581A JP4452581A JPS57159140A JP S57159140 A JPS57159140 A JP S57159140A JP 4452581 A JP4452581 A JP 4452581A JP 4452581 A JP4452581 A JP 4452581A JP S57159140 A JPS57159140 A JP S57159140A
Authority
JP
Japan
Prior art keywords
hybrid
signal
phase
frequency
synthesized
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
JP4452581A
Other languages
Japanese (ja)
Inventor
Masanori Honda
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 JP4452581A priority Critical patent/JPS57159140A/en
Publication of JPS57159140A publication Critical patent/JPS57159140A/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 prevent line interruption and momentary interruption based on failures of a switch, by synthesizing outputs through parallel operation of an existing devide and a spare device. CONSTITUTION:A microwave reception signal is inputted to frequency converters 4A and 4B via an antenna 1, a circulator 2, and a hybrid 3, frequency-converted with a local oscillation signal applied via hybrids 32A and 32B and an IF signal output is produced. Both IF signals are adjusted for the phase fixedly at phase shifters 21A and 21B to be of the same phase and are synthesized at a hybrid 22. The synthesized output is applied to a hybrid 24 via a hybrid 23 and branched into two, and after the phase is fixedly adjusted with phase shifters 25A and 25B, they are inputted to frequency converters 6A and 6B, where the IF signal input is frequency-converted with the local oscillation signal of PLLs 35A and 35B to generate a microwave signal. Both the microwave signals are synthesized at a hybrid 26 and transmitted via a circulator 9 and an antenna 10.
JP4452581A 1981-03-26 1981-03-26 Frequency shift type in repeater Pending JPS57159140A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4452581A JPS57159140A (en) 1981-03-26 1981-03-26 Frequency shift type in repeater

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4452581A JPS57159140A (en) 1981-03-26 1981-03-26 Frequency shift type in repeater

Publications (1)

Publication Number Publication Date
JPS57159140A true JPS57159140A (en) 1982-10-01

Family

ID=12693931

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4452581A Pending JPS57159140A (en) 1981-03-26 1981-03-26 Frequency shift type in repeater

Country Status (1)

Country Link
JP (1) JPS57159140A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08256099A (en) * 1995-03-17 1996-10-01 Fujitsu Ltd Mobile object communication system, radio base station and centralized base station used for the system
US6466276B1 (en) 1997-09-11 2002-10-15 Nec Corporation Signal distributing/synthesizing apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08256099A (en) * 1995-03-17 1996-10-01 Fujitsu Ltd Mobile object communication system, radio base station and centralized base station used for the system
US6466276B1 (en) 1997-09-11 2002-10-15 Nec Corporation Signal distributing/synthesizing apparatus

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