JPS5733826A - Amplitude modulation radio receiver - Google Patents

Amplitude modulation radio receiver

Info

Publication number
JPS5733826A
JPS5733826A JP10939780A JP10939780A JPS5733826A JP S5733826 A JPS5733826 A JP S5733826A JP 10939780 A JP10939780 A JP 10939780A JP 10939780 A JP10939780 A JP 10939780A JP S5733826 A JPS5733826 A JP S5733826A
Authority
JP
Japan
Prior art keywords
amplifying circuit
frequency amplifying
state
sensitivity
transistor
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
JP10939780A
Other languages
Japanese (ja)
Inventor
Toru Kadowaki
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP10939780A priority Critical patent/JPS5733826A/en
Publication of JPS5733826A publication Critical patent/JPS5733826A/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
    • H03J7/18—Automatic scanning over a band of frequencies

Landscapes

  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)

Abstract

PURPOSE:To automatically reduce the receiving sensitivity between channels at the time of automatic sweep, by switching the sensitivity of a high-frequency amplifying circuit in accordance with an output level of an intermediate frequency amplifying circuit. CONSTITUTION:In case of being in an aperiodic state against broad-casting, an output of an intermediate frequency amplifying circuit IF is zero, therefore, a transistor Q2 is off, and voltage across a resistance R3 is also zero. Accordingly, a transistor Q3 is also off. Therefore, in this state, a field effect transistor Q1 constituting a high- frequency amplifying circuit is in a nonoperating state, and the sensitivity of the whole radio receiving circuit is lowered remarkably. In a tuning state, a signal exceeding a certain value is outputte from the intermediated frequency amplifying circuit IF, therefore, the transistors Q2, Q3 become on, and the field effect transistor Q1constituting the high frequency amplifying circuit is operated normally.
JP10939780A 1980-08-09 1980-08-09 Amplitude modulation radio receiver Pending JPS5733826A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10939780A JPS5733826A (en) 1980-08-09 1980-08-09 Amplitude modulation radio receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10939780A JPS5733826A (en) 1980-08-09 1980-08-09 Amplitude modulation radio receiver

Publications (1)

Publication Number Publication Date
JPS5733826A true JPS5733826A (en) 1982-02-24

Family

ID=14509200

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10939780A Pending JPS5733826A (en) 1980-08-09 1980-08-09 Amplitude modulation radio receiver

Country Status (1)

Country Link
JP (1) JPS5733826A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59146143A (en) * 1983-02-10 1984-08-21 Matsushita Electric Ind Co Ltd Planar picture image display device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59146143A (en) * 1983-02-10 1984-08-21 Matsushita Electric Ind Co Ltd Planar picture image display device

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