JPS5483709A - Demodulation system of auxiliary circuit of direct repeater - Google Patents

Demodulation system of auxiliary circuit of direct repeater

Info

Publication number
JPS5483709A
JPS5483709A JP15212377A JP15212377A JPS5483709A JP S5483709 A JPS5483709 A JP S5483709A JP 15212377 A JP15212377 A JP 15212377A JP 15212377 A JP15212377 A JP 15212377A JP S5483709 A JPS5483709 A JP S5483709A
Authority
JP
Japan
Prior art keywords
signals
band
auxiliary
signal
routes
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
JP15212377A
Other languages
Japanese (ja)
Inventor
Takuro Oguchi
Hajime Masuda
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 JP15212377A priority Critical patent/JPS5483709A/en
Publication of JPS5483709A publication Critical patent/JPS5483709A/en
Pending legal-status Critical Current

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Abstract

PURPOSE: To demodulate easily signals of an auxiliary circuit by frequency-discniminating a sum or difference signal obtained by mixing two received waves together in a repeater station in which a direct repeater is installed.
CONSTITUTION: Reception signals (f1) and (f2) of two routes are extracted from transmission lines respectively and mixed by mixer 21 and a sum or difference signal between both signal frequencies is extracted through band-pass filter 22 and demodulated by frequency discriminator 23. In addition to signals of main circuit of both the routes, the output signal of frequency discriminator 23 includes signals of auxiliary circuits of both the routes. In this case, signals of main circuits are generally within a base-band signal band and signals of auxiliary circuits are demodulated into an auxiliary-circut band different from the base-band signal band, so that signals of auxiliary circuits can be extracted by using an adequate filter.
COPYRIGHT: (C)1979,JPO&Japio
JP15212377A 1977-12-17 1977-12-17 Demodulation system of auxiliary circuit of direct repeater Pending JPS5483709A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15212377A JPS5483709A (en) 1977-12-17 1977-12-17 Demodulation system of auxiliary circuit of direct repeater

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15212377A JPS5483709A (en) 1977-12-17 1977-12-17 Demodulation system of auxiliary circuit of direct repeater

Publications (1)

Publication Number Publication Date
JPS5483709A true JPS5483709A (en) 1979-07-04

Family

ID=15533555

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15212377A Pending JPS5483709A (en) 1977-12-17 1977-12-17 Demodulation system of auxiliary circuit of direct repeater

Country Status (1)

Country Link
JP (1) JPS5483709A (en)

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