JPS57173231A - Radio receiver for vehicle - Google Patents

Radio receiver for vehicle

Info

Publication number
JPS57173231A
JPS57173231A JP5705881A JP5705881A JPS57173231A JP S57173231 A JPS57173231 A JP S57173231A JP 5705881 A JP5705881 A JP 5705881A JP 5705881 A JP5705881 A JP 5705881A JP S57173231 A JPS57173231 A JP S57173231A
Authority
JP
Japan
Prior art keywords
circuit
motor
length
receiving antenna
radio wave
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
JP5705881A
Other languages
Japanese (ja)
Inventor
Hiroshige Fukuhara
Norio Fujiki
Motomiki Hirano
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.)
Nissan Motor Co Ltd
Original Assignee
Nissan Motor 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 Nissan Motor Co Ltd filed Critical Nissan Motor Co Ltd
Priority to JP5705881A priority Critical patent/JPS57173231A/en
Publication of JPS57173231A publication Critical patent/JPS57173231A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/125—Means for positioning
    • H01Q1/1257—Means for positioning using the received signal strength

Landscapes

  • Details Of Aerials (AREA)
  • Circuits Of Receivers In General (AREA)

Abstract

PURPOSE:To suppress the detuning of a radio receiver for a vehicle, the generation of a beam noise, and the generation of distortion by varying the length of a receiving antenna according to the intensity of a received radio wave. CONSTITUTION:When a radio wave has enough intensity to be covered by normal AGC, turning on the power source of a radio receiver permits a motor controlling circuit 20 to drive a motor 19, and the length of a receiving antenna 10 is maximized. When a vehicle runs into an area where the received radio wave is intense, e.g., right under a transmitting antenna, the reception input increases and the output of an AGC circuit 18 connected to the output side of a detecting circuit 15 also increases to decrease the gains of a high frequency amplifying circuit 11 and an intermediate frequency amplifying circuit, but when an AGC voltage rises above a reference value, the motor controlling circuit 20 drives the motor 19 to shorten the length of the receiving antenna 10.
JP5705881A 1981-04-17 1981-04-17 Radio receiver for vehicle Pending JPS57173231A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5705881A JPS57173231A (en) 1981-04-17 1981-04-17 Radio receiver for vehicle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5705881A JPS57173231A (en) 1981-04-17 1981-04-17 Radio receiver for vehicle

Publications (1)

Publication Number Publication Date
JPS57173231A true JPS57173231A (en) 1982-10-25

Family

ID=13044836

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5705881A Pending JPS57173231A (en) 1981-04-17 1981-04-17 Radio receiver for vehicle

Country Status (1)

Country Link
JP (1) JPS57173231A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63185204A (en) * 1987-01-28 1988-07-30 Alpine Electron Inc Automatic adjusting device for length of antenna of radio receiver

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63185204A (en) * 1987-01-28 1988-07-30 Alpine Electron Inc Automatic adjusting device for length of antenna of radio receiver

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