JPS5642424A - Input circuit of vhf tuner - Google Patents

Input circuit of vhf tuner

Info

Publication number
JPS5642424A
JPS5642424A JP11720779A JP11720779A JPS5642424A JP S5642424 A JPS5642424 A JP S5642424A JP 11720779 A JP11720779 A JP 11720779A JP 11720779 A JP11720779 A JP 11720779A JP S5642424 A JPS5642424 A JP S5642424A
Authority
JP
Japan
Prior art keywords
band
vhf
circuit
coil
coils
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.)
Granted
Application number
JP11720779A
Other languages
Japanese (ja)
Other versions
JPS6216575B2 (en
Inventor
Ikuo Motoyama
Tomozo Matsumoto
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 JP11720779A priority Critical patent/JPS5642424A/en
Publication of JPS5642424A publication Critical patent/JPS5642424A/en
Publication of JPS6216575B2 publication Critical patent/JPS6216575B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J3/00—Continuous tuning
    • H03J3/02—Details
    • H03J3/16—Tuning without displacement of reactive element, e.g. by varying permeability
    • H03J3/18—Tuning without displacement of reactive element, e.g. by varying permeability by discharge tube or semiconductor device simulating variable reactance
    • H03J3/185—Tuning without displacement of reactive element, e.g. by varying permeability by discharge tube or semiconductor device simulating variable reactance with varactors, i.e. voltage variable reactive diodes

Landscapes

  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)

Abstract

PURPOSE:To obtain an input circuit of superior characteristics by reducing the number of parts without deteriorating required characteristic, by using one of matching coils in common for the high band and low band of VHF. CONSTITUTION:Between input filter 2 receiving signals and high-frequency amplifying circuit 5 as an output circuit, VHF low-band tuning coil 3 and VHF high- band tuning coil 4 are connected in series and between input filter 2 and VHF high- band change-over electric power source terminal 19, the series circuit consisting of band correcting coil 28 and matching coil 29 is connected. Between amplifying circuit 5 and tuning voltage supply terminal 20, varactor diode 6 as a variable capacity element is connected and between the connection point of coils 3 and 4 and that of coils 28 and 29, switch diode 10 is connected. For band switching, diode 10 is controlled by a bias voltage from bias electric power source terminal 18, so that excellent switching will be performed with the simple circuit constitution.
JP11720779A 1979-09-14 1979-09-14 Input circuit of vhf tuner Granted JPS5642424A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11720779A JPS5642424A (en) 1979-09-14 1979-09-14 Input circuit of vhf tuner

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11720779A JPS5642424A (en) 1979-09-14 1979-09-14 Input circuit of vhf tuner

Publications (2)

Publication Number Publication Date
JPS5642424A true JPS5642424A (en) 1981-04-20
JPS6216575B2 JPS6216575B2 (en) 1987-04-13

Family

ID=14706035

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11720779A Granted JPS5642424A (en) 1979-09-14 1979-09-14 Input circuit of vhf tuner

Country Status (1)

Country Link
JP (1) JPS5642424A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0909023A2 (en) * 1997-10-08 1999-04-14 Murata Manufacturing Co., Ltd. Filter working on a plurality of frequency bands
KR100406353B1 (en) * 2001-12-14 2003-11-19 삼성전기주식회사 Switching circuit for input tuning in television tuner
KR100434855B1 (en) * 2002-07-24 2004-06-07 엘지이노텍 주식회사 Vhf voltage control oscillation circuit and tuner capable of receiving two band using the same

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5320509U (en) * 1976-07-29 1978-02-21
JPS5353371U (en) * 1976-10-08 1978-05-08
JPS53116214U (en) * 1977-02-24 1978-09-16

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5320509U (en) * 1976-07-29 1978-02-21
JPS5353371U (en) * 1976-10-08 1978-05-08
JPS53116214U (en) * 1977-02-24 1978-09-16

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0909023A2 (en) * 1997-10-08 1999-04-14 Murata Manufacturing Co., Ltd. Filter working on a plurality of frequency bands
EP0909023B1 (en) * 1997-10-08 2008-12-31 Murata Manufacturing Co., Ltd. Filter working on a plurality of frequency bands
KR100406353B1 (en) * 2001-12-14 2003-11-19 삼성전기주식회사 Switching circuit for input tuning in television tuner
KR100434855B1 (en) * 2002-07-24 2004-06-07 엘지이노텍 주식회사 Vhf voltage control oscillation circuit and tuner capable of receiving two band using the same

Also Published As

Publication number Publication date
JPS6216575B2 (en) 1987-04-13

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