JPS5637718A - Mobile receiver - Google Patents

Mobile receiver

Info

Publication number
JPS5637718A
JPS5637718A JP11329279A JP11329279A JPS5637718A JP S5637718 A JPS5637718 A JP S5637718A JP 11329279 A JP11329279 A JP 11329279A JP 11329279 A JP11329279 A JP 11329279A JP S5637718 A JPS5637718 A JP S5637718A
Authority
JP
Japan
Prior art keywords
turned
attenuator
curve
resistance
receiver
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
JP11329279A
Other languages
Japanese (ja)
Inventor
Takeo Sato
Kazuo Takayama
Takeshi Torii
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.)
Denso Ten Ltd
Toyota Motor Corp
Original Assignee
Denso Ten Ltd
Toyota Motor 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 Denso Ten Ltd, Toyota Motor Corp filed Critical Denso Ten Ltd
Priority to JP11329279A priority Critical patent/JPS5637718A/en
Publication of JPS5637718A publication Critical patent/JPS5637718A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/3052—Automatic control in amplifiers having semiconductor devices in bandpass amplifiers (H.F. or I.F.) or in frequency-changers used in a (super)heterodyne receiver

Landscapes

  • Control Of Amplification And Gain Control (AREA)
  • Circuits Of Receivers In General (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)

Abstract

PURPOSE:To obtain an attenuator control circuit which has a simple constitution and can increase the S/N, by securing the working of the control circuit to make the attenuator effective when the attenuator input is higher than the fixed level and then to make the attenuator ineffective with turn-off of the power supply respectively. CONSTITUTION:The transistor Q3 is off during the make of the power supply since the capacitor C7 is in the discharge state, and thus the transistor Q2 is turned on to flow no current to the diodes D2 and D1. And the resistance R1 functioning as the attenuator is eliminated virtually. Accordingly, the receiver operates in the curve A. The output of the high-frequency amplifying transistor Q1 is high when the input level is high, and also the wave detection output emerging as the voltage of the C7 is high. As a result, the Q3 and Q2 are turned on and off with the D1 and D2 turned on and off with the D1. and D2 turned on Accordingly, the resistance R1 is inserted, and thus the characteristics of the receiver is switched to the curve B. The FF consisting of the Q2 and Q3 is held under these conditions, and no return is given to the curve A although the input level may drop. However, if the power source +B is turned off, the charge of the C7 is discharged. And the Q3 and Q2 are turned off and on when the power source +B is supplied again, and thus the resistance R1 is eliminated to turn the characteristics of the receiver into the curve A.
JP11329279A 1979-09-04 1979-09-04 Mobile receiver Pending JPS5637718A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11329279A JPS5637718A (en) 1979-09-04 1979-09-04 Mobile receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11329279A JPS5637718A (en) 1979-09-04 1979-09-04 Mobile receiver

Publications (1)

Publication Number Publication Date
JPS5637718A true JPS5637718A (en) 1981-04-11

Family

ID=14608481

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11329279A Pending JPS5637718A (en) 1979-09-04 1979-09-04 Mobile receiver

Country Status (1)

Country Link
JP (1) JPS5637718A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57173210A (en) * 1981-04-18 1982-10-25 Pioneer Electronic Corp Antenna receiving and inputting circuit
JPS60142606A (en) * 1983-12-29 1985-07-27 Nec Corp Power failure compensation type alc circuit

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57173210A (en) * 1981-04-18 1982-10-25 Pioneer Electronic Corp Antenna receiving and inputting circuit
JPS632364B2 (en) * 1981-04-18 1988-01-19 Pioneer Electronic Corp
JPS60142606A (en) * 1983-12-29 1985-07-27 Nec Corp Power failure compensation type alc circuit

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