JPS54125913A - Frequency modulation radio transmission system - Google Patents

Frequency modulation radio transmission system

Info

Publication number
JPS54125913A
JPS54125913A JP3379978A JP3379978A JPS54125913A JP S54125913 A JPS54125913 A JP S54125913A JP 3379978 A JP3379978 A JP 3379978A JP 3379978 A JP3379978 A JP 3379978A JP S54125913 A JPS54125913 A JP S54125913A
Authority
JP
Japan
Prior art keywords
frequency
amplifier
base band
signal
carrier
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
JP3379978A
Other languages
Japanese (ja)
Inventor
Osamu Yamamoto
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 JP3379978A priority Critical patent/JPS54125913A/en
Publication of JPS54125913A publication Critical patent/JPS54125913A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B14/00—Transmission systems not characterised by the medium used for transmission
    • H04B14/002—Transmission systems not characterised by the medium used for transmission characterised by the use of a carrier modulation
    • H04B14/006—Angle modulation

Landscapes

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

Abstract

PURPOSE:To omit the isolation filter or the like and thus to simplify the constitution for the multiple radio communication which uses the frequency higher than the microwave band by drawing out the signals of the sub-base band without demodulating the whole of the multiple signal via the repeating installation. CONSTITUTION:Base band signal B and sub-base band S undergo the frequency modulation at transmitter 1 and via modulator 11 and 12 in the same and opposite phases respectively to the carrier wave featuring a fixed difference of frequency to be then transmitted through antenna 18. The electric wave sent through antenna 18 is amplified by the types of the waves at amplifier 22 and 23 of repeating installation 2, and these signals are shifted via frequency shift circuit 24 and 25 to the carrier frequency of the next section and then amplified through amplifier 26 and 27 to be sent out to the next repeater station. The output of amplifier 22 and 23 are branched off respectively and then applied to frequency converter 30. And the frequency difference of both carrier waves is delivered from converter 30, and signal S emerged at the output is demodolated via demodulator 31 to be then delivered.
JP3379978A 1978-03-24 1978-03-24 Frequency modulation radio transmission system Pending JPS54125913A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3379978A JPS54125913A (en) 1978-03-24 1978-03-24 Frequency modulation radio transmission system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3379978A JPS54125913A (en) 1978-03-24 1978-03-24 Frequency modulation radio transmission system

Publications (1)

Publication Number Publication Date
JPS54125913A true JPS54125913A (en) 1979-09-29

Family

ID=12396512

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3379978A Pending JPS54125913A (en) 1978-03-24 1978-03-24 Frequency modulation radio transmission system

Country Status (1)

Country Link
JP (1) JPS54125913A (en)

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