JPS54160107A - Afc circuit of receiver - Google Patents

Afc circuit of receiver

Info

Publication number
JPS54160107A
JPS54160107A JP6951078A JP6951078A JPS54160107A JP S54160107 A JPS54160107 A JP S54160107A JP 6951078 A JP6951078 A JP 6951078A JP 6951078 A JP6951078 A JP 6951078A JP S54160107 A JPS54160107 A JP S54160107A
Authority
JP
Japan
Prior art keywords
circuit
frequency
tuning
receiver
intermediate frequency
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
JP6951078A
Other languages
Japanese (ja)
Inventor
Yoshihiko Hirayama
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.)
Seiko Instruments Inc
Original Assignee
Seiko Instruments Inc
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 Seiko Instruments Inc filed Critical Seiko Instruments Inc
Priority to JP6951078A priority Critical patent/JPS54160107A/en
Publication of JPS54160107A publication Critical patent/JPS54160107A/en
Pending 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
    • H03J7/08—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 varactors, i.e. voltage variable reactive diodes

Landscapes

  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)

Abstract

PURPOSE:To ensure the accurate reception of the reception frequency with perfect prevention of the tuning drift for the receiver incorporating the radio watch to receive the frequency and others by detecting the tuning drift through the frequency discrminating circuit and then securing the automatic correction for the local oscillation frequency. CONSTITUTION:The AM receiver contains tuning circuit 1, mixer circuit 2, detection circuit 4, local oscillator circuit 6, frequency discriminator circuit 7 and others. In such receiver, variable capacity diode 8 of circuit 6 is controlled by the output of circuit 7, and thus the oscillation frequency is varied to be supplied to circuit 2. Then tuning circuit T1 which is a little higher than the intermediate frequency of intermediate frequency amplifier circuit 3 and tuning circuit T2 a little lower than the intermediate frequency plus diode D1 and D2 forming each detection circuit are provided to circuit 7. And the output of circuit 7 is set identical to the variation amount of the tuning frequency caused by the temperature change of circuit 3, thus controlling the oscillation frequency of circuit 6.
JP6951078A 1978-06-09 1978-06-09 Afc circuit of receiver Pending JPS54160107A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6951078A JPS54160107A (en) 1978-06-09 1978-06-09 Afc circuit of receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6951078A JPS54160107A (en) 1978-06-09 1978-06-09 Afc circuit of receiver

Publications (1)

Publication Number Publication Date
JPS54160107A true JPS54160107A (en) 1979-12-18

Family

ID=13404802

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6951078A Pending JPS54160107A (en) 1978-06-09 1978-06-09 Afc circuit of receiver

Country Status (1)

Country Link
JP (1) JPS54160107A (en)

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