JPS56143729A - Receiver for satellite broadcasting - Google Patents

Receiver for satellite broadcasting

Info

Publication number
JPS56143729A
JPS56143729A JP4637380A JP4637380A JPS56143729A JP S56143729 A JPS56143729 A JP S56143729A JP 4637380 A JP4637380 A JP 4637380A JP 4637380 A JP4637380 A JP 4637380A JP S56143729 A JPS56143729 A JP S56143729A
Authority
JP
Japan
Prior art keywords
signal
circuit
agc
attenuation
frequency
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
JP4637380A
Other languages
Japanese (ja)
Inventor
Akiyuki Yoshisato
Sadao Igarashi
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.)
Alps Alpine Co Ltd
Original Assignee
Alps 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 Alps Electric Co Ltd filed Critical Alps Electric Co Ltd
Priority to JP4637380A priority Critical patent/JPS56143729A/en
Publication of JPS56143729A publication Critical patent/JPS56143729A/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

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

Abstract

PURPOSE:To achieve sufficient isolation easily by changing over a vertical polarized signal and horizontal polarized signal by lowering the frequency through frequency conversion and then by controlling the attenuation of an AGC circuit. CONSTITUTION:An input vertical polarized signal is frequency-converted by frequency converting circuit 21 into the 1st IF signal, which is inputted to automatic gain control AGC circuit 26 and the attenuation is controlled with an AGC signal from switching circuit 29 to maximize the attenuation of circuit 26 in the reception of a horizontal polarized signal. The horizontal polarized signal is inputted to frequency converting circuit 22. The 1st IF signal is inputted to AGC circuit 27 and the attenuation is controlled to a constant level with an AGC signal from circuit 29 to maximize the attenuation of circuit 27 in the reception of the vertical polarized signal. Then, IF signals from circuits 26 and 27 are used to select a signal of a desired channel through filter 10, and conversion is performed to lower the frequency of this selective signal; and level detector 14 generates the AGC signal to control circuits 26 and 27 through circuit 29.
JP4637380A 1980-04-09 1980-04-09 Receiver for satellite broadcasting Pending JPS56143729A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4637380A JPS56143729A (en) 1980-04-09 1980-04-09 Receiver for satellite broadcasting

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4637380A JPS56143729A (en) 1980-04-09 1980-04-09 Receiver for satellite broadcasting

Publications (1)

Publication Number Publication Date
JPS56143729A true JPS56143729A (en) 1981-11-09

Family

ID=12745336

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4637380A Pending JPS56143729A (en) 1980-04-09 1980-04-09 Receiver for satellite broadcasting

Country Status (1)

Country Link
JP (1) JPS56143729A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2875075A1 (en) * 2004-09-07 2006-03-10 M D S Internat Sa DEVICE FOR AMPLIFYING THE SIGNAL OF A RECEPTION ANTENNA
JP2006352348A (en) * 2005-06-14 2006-12-28 Alps Electric Co Ltd Frequency converter for receiving satellite broadcast

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2875075A1 (en) * 2004-09-07 2006-03-10 M D S Internat Sa DEVICE FOR AMPLIFYING THE SIGNAL OF A RECEPTION ANTENNA
WO2006027427A1 (en) * 2004-09-07 2006-03-16 Mmds Hypercable Device for amplification of a receiving antenna signal
JP2006352348A (en) * 2005-06-14 2006-12-28 Alps Electric Co Ltd Frequency converter for receiving satellite broadcast

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