JPS572117A - Tuning circuit - Google Patents

Tuning circuit

Info

Publication number
JPS572117A
JPS572117A JP7503780A JP7503780A JPS572117A JP S572117 A JPS572117 A JP S572117A JP 7503780 A JP7503780 A JP 7503780A JP 7503780 A JP7503780 A JP 7503780A JP S572117 A JPS572117 A JP S572117A
Authority
JP
Japan
Prior art keywords
tuning
elements
circuit
pair
variable
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
JP7503780A
Other languages
Japanese (ja)
Inventor
Masayuki Suzuki
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.)
Fujitsu General Ltd
Gen Co Ltd
Original Assignee
Fujitsu General Ltd
Gen 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 Fujitsu General Ltd, Gen Co Ltd filed Critical Fujitsu General Ltd
Priority to JP7503780A priority Critical patent/JPS572117A/en
Publication of JPS572117A publication Critical patent/JPS572117A/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 ensure nearly a constant degree for selection, coupling plus the transmission loss respectively for a tuning circuit that varies over a wide band like a CATV band, by inserting a variable capacity element functioning as a variable inductance in series to a tuning coil. CONSTITUTION:An interstage circuit 3 between an RF amplifying circuit 1 and a mixing circuit 2 is connected to coils 8-11 for prescribed bands and coupled to each other via capacitors 4 and 5 plus variable capacity elements 6 and 7 having an end earthed, and then earthed via a common coil 12. Furthermore a pair of variable capacity elements 14 and 15 functioning as a variable inductance are inserted in series between coils 8/10 and 9/11. The high and low bands are switched to the RF signal by a pair of terminals, an SW and the signal of SW, and a tuning is carried out by controlling the elements 14 and 15 with the tuning voltage supplied through a pair of terminals Tu and Tu. As the elements 14 and 15 function as a variable inductance, nearly a constant degree can be secured over a wide band for selection, coupling (band width) and transmission loss respectively.
JP7503780A 1980-06-04 1980-06-04 Tuning circuit Pending JPS572117A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7503780A JPS572117A (en) 1980-06-04 1980-06-04 Tuning circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7503780A JPS572117A (en) 1980-06-04 1980-06-04 Tuning circuit

Publications (1)

Publication Number Publication Date
JPS572117A true JPS572117A (en) 1982-01-07

Family

ID=13564596

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7503780A Pending JPS572117A (en) 1980-06-04 1980-06-04 Tuning circuit

Country Status (1)

Country Link
JP (1) JPS572117A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS599636U (en) * 1982-07-09 1984-01-21 シャープ株式会社 TV tuner for wideband reception
JPS5951617A (en) * 1982-09-17 1984-03-26 Sharp Corp Television tuner for broad band reception
JPS61205015A (en) * 1985-03-01 1986-09-11 アールシーエー　トムソン　ライセンシング　コーポレイシヨン Tuning voltage tracking apparatus

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS599636U (en) * 1982-07-09 1984-01-21 シャープ株式会社 TV tuner for wideband reception
JPS5951617A (en) * 1982-09-17 1984-03-26 Sharp Corp Television tuner for broad band reception
JPS61205015A (en) * 1985-03-01 1986-09-11 アールシーエー　トムソン　ライセンシング　コーポレイシヨン Tuning voltage tracking apparatus
JPH0525403B2 (en) * 1985-03-01 1993-04-12 Aaru Shii Ee Tomuson Raisenshingu Corp

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