JPS5552642A - Tuner unit of television receiver - Google Patents

Tuner unit of television receiver

Info

Publication number
JPS5552642A
JPS5552642A JP12764078A JP12764078A JPS5552642A JP S5552642 A JPS5552642 A JP S5552642A JP 12764078 A JP12764078 A JP 12764078A JP 12764078 A JP12764078 A JP 12764078A JP S5552642 A JPS5552642 A JP S5552642A
Authority
JP
Japan
Prior art keywords
signals
uhf
mixer
amplifier
intermediate 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
JP12764078A
Other languages
Japanese (ja)
Inventor
Isao Fujimoto
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.)
Sanyo Electric Co Ltd
Original Assignee
Sanyo 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 Sanyo Electric Co Ltd filed Critical Sanyo Electric Co Ltd
Priority to JP12764078A priority Critical patent/JPS5552642A/en
Publication of JPS5552642A publication Critical patent/JPS5552642A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/16—Circuits
    • H04B1/26—Circuits for superheterodyne receivers

Abstract

PURPOSE:To obtain a television tuner for which the number of varactor diodes is small and a low oscillation frequency of a local oscillator is sufficient. CONSTITUTION:UHF signals from terminal 27 are applied to second mixer 32 through UHF selection circuit 29 including a varactor diode, UHF amplifier 30 and inter-stage tuning circuit 31 after passing through attenuator 28. Second mixer 32 converts UHF signals to an intermediate frequency of 56.5MHz by the output of second oscillator 33 which is variably controlled simultaneously with selection circuit 29 and the varactor diode included in inter-stage tuning circuit 31, and this intermediate frequency is applied to intermediate frequency amplifier 34. The output of first oscillator 25 is added to VHF signals from terminal 19, and these VHF signals are converted to UHF signals of 770-902MHz through attenuator 20 and amplifier 23 by first mixer 24. These signals are applied to selection circuit 29.
JP12764078A 1978-10-12 1978-10-12 Tuner unit of television receiver Pending JPS5552642A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12764078A JPS5552642A (en) 1978-10-12 1978-10-12 Tuner unit of television receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12764078A JPS5552642A (en) 1978-10-12 1978-10-12 Tuner unit of television receiver

Publications (1)

Publication Number Publication Date
JPS5552642A true JPS5552642A (en) 1980-04-17

Family

ID=14965085

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12764078A Pending JPS5552642A (en) 1978-10-12 1978-10-12 Tuner unit of television receiver

Country Status (1)

Country Link
JP (1) JPS5552642A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5280636A (en) * 1991-06-13 1994-01-18 Hughes Aircraft Company Multi-band digital receiving apparatus and method with bandwidth reduction

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5280636A (en) * 1991-06-13 1994-01-18 Hughes Aircraft Company Multi-band digital receiving apparatus and method with bandwidth reduction

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