JPS55151812A - Television tuner circuit - Google Patents

Television tuner circuit

Info

Publication number
JPS55151812A
JPS55151812A JP5911879A JP5911879A JPS55151812A JP S55151812 A JPS55151812 A JP S55151812A JP 5911879 A JP5911879 A JP 5911879A JP 5911879 A JP5911879 A JP 5911879A JP S55151812 A JPS55151812 A JP S55151812A
Authority
JP
Japan
Prior art keywords
uhf
receiving time
vhf
voltage
backward bias
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
JP5911879A
Other languages
Japanese (ja)
Inventor
Tomozo Matsumoto
Kiyoshi Amamiya
Yukiomi Kanai
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 JP5911879A priority Critical patent/JPS55151812A/en
Publication of JPS55151812A publication Critical patent/JPS55151812A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J5/00—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner
    • H03J5/24—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with a number of separate pretuned tuning circuits or separate tuning elements selectively brought into circuit, e.g. for waveband selection or for television channel selection
    • H03J5/242—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with a number of separate pretuned tuning circuits or separate tuning elements selectively brought into circuit, e.g. for waveband selection or for television channel selection used exclusively for band selection
    • H03J5/244—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with a number of separate pretuned tuning circuits or separate tuning elements selectively brought into circuit, e.g. for waveband selection or for television channel selection used exclusively for band selection using electronic means

Landscapes

  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)

Abstract

PURPOSE:To obtain a clear UHF picture image free from any disturbing phenomenon, by applying the backward bias to the switch diode used for the input circuit of the VHF tuner part and at the UHF receiving time by means of the power source to be supplied to the VHF mixer. CONSTITUTION:The voltage is applied to mixer 7 which is used for the IF amplifier at the UHF receiving time, and then the backward bias is applied to switch diodes 2 and 3 via resistance 19. Thus the vias voltage can be controlled via resistances 4, 5, 16, 17 and 19 each. And the disturbance property can be reduced by applying the deep backward bias voltage at the receiving time of UHF and even though the signal of large amplitude may be transmitted to the VHF input terminal. As a result, a clear UHF picture image can be obtained with an disturbing phenomenon.
JP5911879A 1979-05-16 1979-05-16 Television tuner circuit Pending JPS55151812A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5911879A JPS55151812A (en) 1979-05-16 1979-05-16 Television tuner circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5911879A JPS55151812A (en) 1979-05-16 1979-05-16 Television tuner circuit

Publications (1)

Publication Number Publication Date
JPS55151812A true JPS55151812A (en) 1980-11-26

Family

ID=13104071

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5911879A Pending JPS55151812A (en) 1979-05-16 1979-05-16 Television tuner circuit

Country Status (1)

Country Link
JP (1) JPS55151812A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100746271B1 (en) * 2006-05-19 2007-08-09 김선의 Functional brassiere

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100746271B1 (en) * 2006-05-19 2007-08-09 김선의 Functional brassiere

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