JPS645122A - Double conversion tuner - Google Patents

Double conversion tuner

Info

Publication number
JPS645122A
JPS645122A JP15960687A JP15960687A JPS645122A JP S645122 A JPS645122 A JP S645122A JP 15960687 A JP15960687 A JP 15960687A JP 15960687 A JP15960687 A JP 15960687A JP S645122 A JPS645122 A JP S645122A
Authority
JP
Japan
Prior art keywords
frequency
signal
input
frfn
band
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
JP15960687A
Other languages
Japanese (ja)
Inventor
Yoshinori Kayagaki
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP15960687A priority Critical patent/JPS645122A/en
Publication of JPS645122A publication Critical patent/JPS645122A/en
Pending legal-status Critical Current

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Landscapes

  • Superheterodyne Receivers (AREA)

Abstract

PURPOSE:To prevent back talk by presetting the value of the 1st intermediate frequency so that the frequency of the 1st local oscillator in receiving an input signal with a minimum frequency in the reception frequency range is twice or over the input signal of the highest frequency in the reception frequency range and its value does not exceed 1GHz. CONSTITUTION:The 1st intermediate frequency f1P is selected so that the frequency f1 of the 1st local oscillator 4 in receiving a signal of the lowest frequency fRF1 in the reception frequency range fRF1-fRFn is twice or over the signal of the highest frequency fRFn in the reception frequency range. A RF signal (signal band W) received from the input terminal 1 is converted into the 1st local oscillation frequency f1 by the 1st mixer 3 and the difference component (signal band W') is fed back to the input side to form a back talk component. However, the lowest frequency (f1-fRFn) of the difference component is at the outside of the band fRF1-fRFn of the input band pass filter 2, the difference component is attenuated by the input band pass filter 2. Thus, back talk is blocked without adding any new circuit while utilizing the amplification element within 1GHz.
JP15960687A 1987-06-29 1987-06-29 Double conversion tuner Pending JPS645122A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15960687A JPS645122A (en) 1987-06-29 1987-06-29 Double conversion tuner

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15960687A JPS645122A (en) 1987-06-29 1987-06-29 Double conversion tuner

Publications (1)

Publication Number Publication Date
JPS645122A true JPS645122A (en) 1989-01-10

Family

ID=15697386

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15960687A Pending JPS645122A (en) 1987-06-29 1987-06-29 Double conversion tuner

Country Status (1)

Country Link
JP (1) JPS645122A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7126390B2 (en) 2002-08-28 2006-10-24 Sharp Kabushiki Kaisha Frequency conversion apparatus
CN1295461C (en) * 2004-09-09 2007-01-17 梁建华 Device for decocting porridge

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7126390B2 (en) 2002-08-28 2006-10-24 Sharp Kabushiki Kaisha Frequency conversion apparatus
CN1295461C (en) * 2004-09-09 2007-01-17 梁建华 Device for decocting porridge

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