JPS56128015A - Radio receiver equipped with automatic channel selection device - Google Patents

Radio receiver equipped with automatic channel selection device

Info

Publication number
JPS56128015A
JPS56128015A JP3302880A JP3302880A JPS56128015A JP S56128015 A JPS56128015 A JP S56128015A JP 3302880 A JP3302880 A JP 3302880A JP 3302880 A JP3302880 A JP 3302880A JP S56128015 A JPS56128015 A JP S56128015A
Authority
JP
Japan
Prior art keywords
level
channel selection
circuit
signal
automatic channel
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
JP3302880A
Other languages
Japanese (ja)
Inventor
Masaharu Nishiwaki
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP3302880A priority Critical patent/JPS56128015A/en
Publication of JPS56128015A publication Critical patent/JPS56128015A/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 prevent the deterioration of stop sensitivity by lowering the level of a receiving signal, at the time of automatic channel selection. CONSTITUTION:A level change element 10 consisting of a diode and a level changing circuit 11 are connected to the input side of the high frequency amplifying circuit 2. When an automatic channel selection command signal (e) has been applied, the circuit 11 outputs a level change command signal, the element 10 conducts by this signal, and the level of a receiving signal is lowered. At this stage, the change-over switch 17 selects the currents I1, I2, and sets the level lowering width by the element 10 to 2 stages. Also, the output of the intermediate frequency amplifier 3 is led to the stop signal generating circuit 7, and when voltage of the point A has reached the reference value, the circuit 7 stops the sweep. Accordingly, since the stop sensitivity is set by being divided into two stages, delay of the channel selection work is prevented.
JP3302880A 1980-03-12 1980-03-12 Radio receiver equipped with automatic channel selection device Pending JPS56128015A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3302880A JPS56128015A (en) 1980-03-12 1980-03-12 Radio receiver equipped with automatic channel selection device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3302880A JPS56128015A (en) 1980-03-12 1980-03-12 Radio receiver equipped with automatic channel selection device

Publications (1)

Publication Number Publication Date
JPS56128015A true JPS56128015A (en) 1981-10-07

Family

ID=12375327

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3302880A Pending JPS56128015A (en) 1980-03-12 1980-03-12 Radio receiver equipped with automatic channel selection device

Country Status (1)

Country Link
JP (1) JPS56128015A (en)

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