JPS56122537A - Heterodyne receiver provided with amplitude control - Google Patents

Heterodyne receiver provided with amplitude control

Info

Publication number
JPS56122537A
JPS56122537A JP2691580A JP2691580A JPS56122537A JP S56122537 A JPS56122537 A JP S56122537A JP 2691580 A JP2691580 A JP 2691580A JP 2691580 A JP2691580 A JP 2691580A JP S56122537 A JPS56122537 A JP S56122537A
Authority
JP
Japan
Prior art keywords
amplifier
level
frequency converter
detected
signal
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
JP2691580A
Other languages
Japanese (ja)
Inventor
Yuji Kitahara
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP2691580A priority Critical patent/JPS56122537A/en
Publication of JPS56122537A publication Critical patent/JPS56122537A/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
    • H03G3/22—Automatic control in amplifiers having discharge tubes
    • H03G3/225—Automatic control in amplifiers having discharge tubes controlling or controlled by the (local) oscillators of a (super)heterodyne receiver

Landscapes

  • Superheterodyne Receivers (AREA)
  • Tone Control, Compression And Expansion, Limiting Amplitude (AREA)

Abstract

PURPOSE:To prevent the deterioration of a circuit quality, which is caused by nonlinear distortion of the IF amplifier, by detecting an input high frequency level by the diode provided on the receiving frequency converter, and lowering the conversion efficiency of the receiving frequency converter, in case of a level which generates 2 nonlinear distortions in the IF amplifier. CONSTITUTION:A signal level which has been input to the prehigh frequency amplifier 1 is detected by a diode current of the receiving frequency converter 5 connected to the circulator 3, and when the signal level which has been detected in this way exceeds the level for generating the nonlinar by the preintermediate frequency amplifier 6 and the main intermediate frequency amplifier 7, its detected DC signal is provided to the control circuit 11. And, by the output of the control circuit 11, the variable attenuator 12 for providing a local oscillation signal from the local oscillator 4 to the circulator 3 is controlled, the conversion efficiency of the frequency converter 5 is lowered, the nonlinear distortion generated by the amplifiers 6, 7 when the input electric field to the amplifier 1 is large is prevented, and the circuit quality is elevated.
JP2691580A 1980-03-03 1980-03-03 Heterodyne receiver provided with amplitude control Pending JPS56122537A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2691580A JPS56122537A (en) 1980-03-03 1980-03-03 Heterodyne receiver provided with amplitude control

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2691580A JPS56122537A (en) 1980-03-03 1980-03-03 Heterodyne receiver provided with amplitude control

Publications (1)

Publication Number Publication Date
JPS56122537A true JPS56122537A (en) 1981-09-26

Family

ID=12206494

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2691580A Pending JPS56122537A (en) 1980-03-03 1980-03-03 Heterodyne receiver provided with amplitude control

Country Status (1)

Country Link
JP (1) JPS56122537A (en)

Similar Documents

Publication Publication Date Title
MY108184A (en) Feed forward amplifier network with frequency swept pilot tone.
DE69122139D1 (en) Circuit for reducing the distortion of a high frequency power amplifier
GB1057513A (en) Improvements in or relating to low level signal amplifiers
JPS56122537A (en) Heterodyne receiver provided with amplitude control
JPS56122536A (en) Heterodyne receiving equipment provided with amplitude control
ES8201374A1 (en) High-power electrical signals generator.
JPS5758480A (en) De-emphasis circuit
SU1125551A1 (en) Wide-band ac-to-dc voltage converter
GB876042A (en) Improvements in or relating to transistor circuit arrangements for demodulating and amplifying signals
JPS5640309A (en) Extra-high frequency transistor amplifying unit
SU1050093A1 (en) Class d power amplifier
JPS5787253A (en) Timing extracting circuit
GB1010446A (en) Negative feedback phase detection receiving equipment
SU1548852A1 (en) Radio transmitter of single-sideband signals
JPS6446351A (en) Digital signal receiver
JPS55143805A (en) Am frequency converter
JPS5564409A (en) Agc circuit of receiver
SU1107076A1 (en) Modulation radiometer
JPS6448525A (en) Transmission panel
JPS5552619A (en) Limiter circuit for fm receiver
JPS5676638A (en) Automatic output controlling system for am transmitter
JPS5623010A (en) Gain limit amplifying circuit
JPS5533376A (en) Frequency discriminator circuit
ATE286635T1 (en) RECEIVER WITH LOW QUIZ CURRENT
JPS56106431A (en) Transistor of reduced carrier ssb signal