JPS5648728A - Channel selector for radio - Google Patents

Channel selector for radio

Info

Publication number
JPS5648728A
JPS5648728A JP12518679A JP12518679A JPS5648728A JP S5648728 A JPS5648728 A JP S5648728A JP 12518679 A JP12518679 A JP 12518679A JP 12518679 A JP12518679 A JP 12518679A JP S5648728 A JPS5648728 A JP S5648728A
Authority
JP
Japan
Prior art keywords
local oscillator
output
signal
amplifier
inputted
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
JP12518679A
Other languages
Japanese (ja)
Other versions
JPS6121019B2 (en
Inventor
Yukio Ishiyama
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.)
Alps Alpine Co Ltd
Original Assignee
Alps 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 Alps Electric Co Ltd filed Critical Alps Electric Co Ltd
Priority to JP12518679A priority Critical patent/JPS5648728A/en
Publication of JPS5648728A publication Critical patent/JPS5648728A/en
Publication of JPS6121019B2 publication Critical patent/JPS6121019B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J7/00—Automatic frequency control; Automatic scanning over a band of frequencies
    • H03J7/02—Automatic frequency control
    • H03J7/04—Automatic frequency control where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant
    • H03J7/06—Automatic frequency control where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant using counters or frequency dividers
    • H03J7/065—Automatic frequency control where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant using counters or frequency dividers the counter or frequency divider being used in a phase locked loop

Landscapes

  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)
  • Superheterodyne Receivers (AREA)
  • Circuits Of Receivers In General (AREA)

Abstract

PURPOSE:To simplify constitution by bringing the local oscillator of an FM receiver under AFC by feeding the output of LPF of PLL to tuning circuits of an AM receiver and FM receiver. CONSTITUTION:Change-over switch 11 controls only AM-FM change-over circuit 6 and when switch 10 is placed at the AM side, a signal from antenna 18 is inputted to the front end consisting of high frequency amplifier 20, mixer 21 and local oscillator 19 to control local oscillator 19 and amplifier 20 by the output tuning voltage of LPF17 of the PLL circuit. The output of local oscillator 19 is inputted to phase comparator 14 via variable frequency divider 13 to perform PLL operation. When switch 11 is changed over to the FM side, the signal is inputted to the front end consisting of antenna 1, high frequency amplifier 2, mixer 3, and local oscillator 9 and converted into a signal of an IF frequency, which is IF-amplified 4 and detected by FM detector 5. Amplifier 2 and local oscillator 9, controlled by a tuning voltage from LPF17, generate an AFC signal from the output of detector 5 and applies it to local oscillator 9 to keep an oscillating frequency constant.
JP12518679A 1979-09-28 1979-09-28 Channel selector for radio Granted JPS5648728A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12518679A JPS5648728A (en) 1979-09-28 1979-09-28 Channel selector for radio

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12518679A JPS5648728A (en) 1979-09-28 1979-09-28 Channel selector for radio

Publications (2)

Publication Number Publication Date
JPS5648728A true JPS5648728A (en) 1981-05-02
JPS6121019B2 JPS6121019B2 (en) 1986-05-24

Family

ID=14904029

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12518679A Granted JPS5648728A (en) 1979-09-28 1979-09-28 Channel selector for radio

Country Status (1)

Country Link
JP (1) JPS5648728A (en)

Also Published As

Publication number Publication date
JPS6121019B2 (en) 1986-05-24

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