JPS55123229A - Tuner for television receiver - Google Patents

Tuner for television receiver

Info

Publication number
JPS55123229A
JPS55123229A JP3001679A JP3001679A JPS55123229A JP S55123229 A JPS55123229 A JP S55123229A JP 3001679 A JP3001679 A JP 3001679A JP 3001679 A JP3001679 A JP 3001679A JP S55123229 A JPS55123229 A JP S55123229A
Authority
JP
Japan
Prior art keywords
frequency
disturbance
mixer
suppress
oscillation
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
JP3001679A
Other languages
Japanese (ja)
Inventor
Takeshi Saito
Takao Shinkawa
Mitsuhisa Shinagawa
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 JP3001679A priority Critical patent/JPS55123229A/en
Publication of JPS55123229A publication Critical patent/JPS55123229A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D7/00—Transference of modulation from one carrier to another, e.g. frequency-changing
    • H03D7/16—Multiple-frequency-changing

Abstract

PURPOSE:To suppress the disturbance generation of the 1st mixer by setting the 1st intermediate frequency not less than twice the upper limited frequency of the UHF band and not more than four times the lower limited frequency. CONSTITUTION:The oscillation frequency of the 1st local oscillation 13 is set higher than the 1st intermediate frequency fi1, and the oscillation frequency of the 2nd local oscillation 18 lower than frequency fi1 by the 2nd intermediate frequency fi2. Further, the 1st intermediate frequency fi1 is set not less than twice the upper limited frequency of the UHF band and not more than four times and lower limited frequency of the UHF band. Input circuit 10 of this tuner is provided with a trap attenuating frequencies fi2, fi1/2 and fi1/4 and the 1st mixer 12 suppresses the occurrence of disturbance of frequency fi1. Further, the 1st intermediate freqency filter 14 functions to suppress disturbance of fi1/2 in frequency and also has the BPF characteristics of a narrow band of approximate 8MHz to reduce cross modulation disturbance generated by the 1st intermediate amplifier 15, and filter 16 attenuates a frequency 2fi2 lower than fi1 to suppress image disturbance of the 2nd mixer 17.
JP3001679A 1979-03-16 1979-03-16 Tuner for television receiver Pending JPS55123229A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3001679A JPS55123229A (en) 1979-03-16 1979-03-16 Tuner for television receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3001679A JPS55123229A (en) 1979-03-16 1979-03-16 Tuner for television receiver

Publications (1)

Publication Number Publication Date
JPS55123229A true JPS55123229A (en) 1980-09-22

Family

ID=12292047

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3001679A Pending JPS55123229A (en) 1979-03-16 1979-03-16 Tuner for television receiver

Country Status (1)

Country Link
JP (1) JPS55123229A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5875316A (en) * 1981-08-19 1983-05-07 アールシーエー　ライセンシング　コーポレーシヨン Multiple frequency band tuning system

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5388511A (en) * 1977-01-13 1978-08-04 Sony Corp Tuner

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5388511A (en) * 1977-01-13 1978-08-04 Sony Corp Tuner

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5875316A (en) * 1981-08-19 1983-05-07 アールシーエー　ライセンシング　コーポレーシヨン Multiple frequency band tuning system
JPH0322729B2 (en) * 1981-08-19 1991-03-27 Rca Licensing Corp

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