JPS5553929A - Circuit for radio communication unit - Google Patents

Circuit for radio communication unit

Info

Publication number
JPS5553929A
JPS5553929A JP12625678A JP12625678A JPS5553929A JP S5553929 A JPS5553929 A JP S5553929A JP 12625678 A JP12625678 A JP 12625678A JP 12625678 A JP12625678 A JP 12625678A JP S5553929 A JPS5553929 A JP S5553929A
Authority
JP
Japan
Prior art keywords
frequency
vco3
local oscillation
radio communication
communication unit
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
JP12625678A
Other languages
Japanese (ja)
Other versions
JPS5820169B2 (en
Inventor
Masanobu Hasegawa
Koji Ogi
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.)
Yaesu Musen Co Ltd
Original Assignee
Yaesu Musen 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 Yaesu Musen Co Ltd filed Critical Yaesu Musen Co Ltd
Priority to JP53126256A priority Critical patent/JPS5820169B2/en
Publication of JPS5553929A publication Critical patent/JPS5553929A/en
Publication of JPS5820169B2 publication Critical patent/JPS5820169B2/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
    • H04B1/06—Receivers
    • H04B1/16—Circuits
    • H04B1/26—Circuits for superheterodyne receivers

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Transmitters (AREA)
  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)
  • Transceivers (AREA)
  • Superheterodyne Receivers (AREA)

Abstract

PURPOSE:To secure the quick frequency follow-up properties with a fine frequency step space for the radio communication unit featuring such type in that the local oscillation frequency is varied in steps of a fixed space to set the operation frequency, by securing the interpolation via the VXO (variable frequency crystal oscillator). CONSTITUTION:Input signal F is mixed with 1st local oscillation frequency f1 through mixer 1 to be changed into 1st intermediate frequency F1, and then mixed with 2nd local oscillation frequency f2 at mixer 2 to be changed into 2nd intermediate frequency F2 for amplification and detection. Then frequency f1 supplied from VCO3 is divided at programable divider 4 and then undergoes the phase comparison with the frequency of reference oscillator 6 through phase comparator 5. And the control DC voltage caused by the phase difference of both frequencies is fed back to VCO3 to stabilize the oscillation frequency. In this case, the frequency of VCO3 varies with the frequency step equal to the frequency of oscillator 6 with every increment and decrement of the division ratio of divider 4 in one unit. Frequency f2 is supplied from VXO7 to give the interpolation to the step space of frequency f1.
JP53126256A 1978-10-16 1978-10-16 wireless communication device circuit Expired JPS5820169B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP53126256A JPS5820169B2 (en) 1978-10-16 1978-10-16 wireless communication device circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP53126256A JPS5820169B2 (en) 1978-10-16 1978-10-16 wireless communication device circuit

Publications (2)

Publication Number Publication Date
JPS5553929A true JPS5553929A (en) 1980-04-19
JPS5820169B2 JPS5820169B2 (en) 1983-04-21

Family

ID=14930666

Family Applications (1)

Application Number Title Priority Date Filing Date
JP53126256A Expired JPS5820169B2 (en) 1978-10-16 1978-10-16 wireless communication device circuit

Country Status (1)

Country Link
JP (1) JPS5820169B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4395777A (en) * 1980-01-12 1983-07-26 Sony Corporation Double superheterodyne receiver

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4395777A (en) * 1980-01-12 1983-07-26 Sony Corporation Double superheterodyne receiver

Also Published As

Publication number Publication date
JPS5820169B2 (en) 1983-04-21

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