JPS5471513A - Output monitor unit for shf band fm transmitter - Google Patents

Output monitor unit for shf band fm transmitter

Info

Publication number
JPS5471513A
JPS5471513A JP13876577A JP13876577A JPS5471513A JP S5471513 A JPS5471513 A JP S5471513A JP 13876577 A JP13876577 A JP 13876577A JP 13876577 A JP13876577 A JP 13876577A JP S5471513 A JPS5471513 A JP S5471513A
Authority
JP
Japan
Prior art keywords
output
frequency
transmission
circuit
terminal
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.)
Granted
Application number
JP13876577A
Other languages
Japanese (ja)
Other versions
JPS6026334B2 (en
Inventor
Takeo Konno
Tadamasa Kurihara
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 JP52138765A priority Critical patent/JPS6026334B2/en
Publication of JPS5471513A publication Critical patent/JPS5471513A/en
Publication of JPS6026334B2 publication Critical patent/JPS6026334B2/en
Expired 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
    • H04B1/02—Transmitters
    • H04B1/04—Circuits

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)
  • Transmitters (AREA)

Abstract

PURPOSE:To perform the monitor for the output power independently of the transmission frequency, by monitoring the FM modulation signal without using the cubic circuit through the demodulation of the signal which is always at a given frequency, by performing beat-down for the transmission frequency with the output of the transmission local oscillation frequency. CONSTITUTION:The modulation wave input from the terminal a is FM-modulated with the FM modulator 1, the output frequency f1 of the modulator 1 is converted into the frequency f2 with the transmission frequency conversion circuit 2 and it is amplified with the power amplifier 3 and is delivered to the transmission output terminal 6 via the pick up circuit 4. A part of the transmission output separated with the circit 4 and a part of the output of the transmission local oscillator 5 seperated with the pick up circuit 6 are synthesized with the dual frequency synthesizing circuit 7 and the resultant is fed to the detector 8. Further, the output of the detector 8 is fed to BPF5, obtaining the same frequency f1 as that of the modulater 1. This output is demodulated with the FM demodulater 10 and is delivered to the monitor output terminal C. Further, the output of the detector 8 is fed to LPF 11 and it is outputted to the power monitor terminal d after picking up DC component.
JP52138765A 1977-11-17 1977-11-17 SHF band FM transmitter output monitor device Expired JPS6026334B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP52138765A JPS6026334B2 (en) 1977-11-17 1977-11-17 SHF band FM transmitter output monitor device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP52138765A JPS6026334B2 (en) 1977-11-17 1977-11-17 SHF band FM transmitter output monitor device

Publications (2)

Publication Number Publication Date
JPS5471513A true JPS5471513A (en) 1979-06-08
JPS6026334B2 JPS6026334B2 (en) 1985-06-22

Family

ID=15229657

Family Applications (1)

Application Number Title Priority Date Filing Date
JP52138765A Expired JPS6026334B2 (en) 1977-11-17 1977-11-17 SHF band FM transmitter output monitor device

Country Status (1)

Country Link
JP (1) JPS6026334B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111200469A (en) * 2018-11-19 2020-05-26 联发科技股份有限公司 Frequency modulation channel detection circuit and related method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111200469A (en) * 2018-11-19 2020-05-26 联发科技股份有限公司 Frequency modulation channel detection circuit and related method

Also Published As

Publication number Publication date
JPS6026334B2 (en) 1985-06-22

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