JPS564941A - Transmission frequency control system - Google Patents

Transmission frequency control system

Info

Publication number
JPS564941A
JPS564941A JP7969579A JP7969579A JPS564941A JP S564941 A JPS564941 A JP S564941A JP 7969579 A JP7969579 A JP 7969579A JP 7969579 A JP7969579 A JP 7969579A JP S564941 A JPS564941 A JP S564941A
Authority
JP
Japan
Prior art keywords
frequency
oscillator
comparator
oscillation frequency
output
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
JP7969579A
Other languages
Japanese (ja)
Inventor
Itsuro 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.)
Hitachi Denshi KK
Original Assignee
Hitachi Denshi KK
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 Hitachi Denshi KK filed Critical Hitachi Denshi KK
Priority to JP7969579A priority Critical patent/JPS564941A/en
Publication of JPS564941A publication Critical patent/JPS564941A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C3/00—Angle modulation
    • H03C3/02—Details
    • H03C3/09—Modifications of modulator for regulating the mean frequency

Landscapes

  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)
  • Transmitters (AREA)

Abstract

PURPOSE:To attain utilization for a transmitter of the microwave band, etc., by making it possible to stabilize a trasmission frequency with simple circuit constiution by providing a phase comparator for control over the oscillation frequency of a modulating oscillator. CONSTITUTION:The 2nd oscillator 10-2 generating fixed difference frequency fd is provided and its reference frequency output is supplied to one input of phase comparator 11. On the other hand, the 1st oscillator 10-1 generating local oscillation frequency f1 is also provided. Difference frequency fd=ft-f1 (provided that ft is a transmission frequency) is extracted by modulator 9 and amplified at 4-2 and its output is applied to the other input of comparator 11, which generates a comparison output according to a phase difference between both the inputs, thereby controlling the oscillation frequency of oscillator 2 directly. Namely, the oscillation frequency of oscillator 2 is controlled with a DC voltage obtained from comparator according to the fluctuations of frequency ft to obtain a center frequency, so that the stabilization of frequency ft will be secured.
JP7969579A 1979-06-26 1979-06-26 Transmission frequency control system Pending JPS564941A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7969579A JPS564941A (en) 1979-06-26 1979-06-26 Transmission frequency control system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7969579A JPS564941A (en) 1979-06-26 1979-06-26 Transmission frequency control system

Publications (1)

Publication Number Publication Date
JPS564941A true JPS564941A (en) 1981-01-19

Family

ID=13697338

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7969579A Pending JPS564941A (en) 1979-06-26 1979-06-26 Transmission frequency control system

Country Status (1)

Country Link
JP (1) JPS564941A (en)

Similar Documents

Publication Publication Date Title
RU95119833A (en) POWER AMPLIFIER COMBINED WITH THE AMPLITUDE MODULATION CONTROLLER AND THE PHASE MODULATION CONTROLLER
DE3780842D1 (en) HIGH FREQUENCY GENERATOR WITH AUTOMATIC PERFORMANCE CONTROL FOR HIGH FREQUENCY SURGERY.
SE8002675L (en) Frequency modulator
US2747083A (en) Frequency-modulated high-frequency system
JPS62188841U (en)
GB8313616D0 (en) Signal generators
JPS564941A (en) Transmission frequency control system
GB562728A (en) Stable electric-oscillation generator and angular-velocity modulator
US2602159A (en) Frequency modulation generator
ES8306299A1 (en) Frequency converter and phase locked loop circuit
JPS55149506A (en) Frequency modulator
JPS6478524A (en) Phase locked oscillator
JPS5531328A (en) Modulator
JPS5588419A (en) Frequency sweep receiver
JPS5679538A (en) Microwave phase control type oscillator
JPS57135505A (en) Modulator
JPS56147523A (en) Phase synchronizing circuit
JPS55112044A (en) Microwave phase control type oscillator
JPS5683136A (en) Frequency synthesizer
JPS60169234A (en) Wireless communication equipment
JPS5732133A (en) Phase-synchronous oscillator
JPS55100795A (en) Remote control system
JPS57152258A (en) Fm modulator
JPS5538737A (en) Dispersive radio transmission device
JPS5586236A (en) Auxiliary signal insersion system of multidirectional communication network