JPS577617A - Electronic tuner - Google Patents

Electronic tuner

Info

Publication number
JPS577617A
JPS577617A JP8193080A JP8193080A JPS577617A JP S577617 A JPS577617 A JP S577617A JP 8193080 A JP8193080 A JP 8193080A JP 8193080 A JP8193080 A JP 8193080A JP S577617 A JPS577617 A JP S577617A
Authority
JP
Japan
Prior art keywords
circuit
tuning
coils
terminal
input
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
JP8193080A
Other languages
Japanese (ja)
Other versions
JPH0156567B2 (en
Inventor
Toao Ishida
Keisuke Utsunomiya
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP8193080A priority Critical patent/JPS577617A/en
Publication of JPS577617A publication Critical patent/JPS577617A/en
Publication of JPH0156567B2 publication Critical patent/JPH0156567B2/ja
Granted 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)
  • Superheterodyne Receivers (AREA)

Abstract

PURPOSE:To perform continuous reception of 120-300MHz by using two varactor diodes connected in series and parallel to tuning coils of the input circuit, interstage circuit and oscillating circuit of a tuner which receives even the CATV band. CONSTITUTION:An input signal of VHFTV is inputted from a terminal (a), passed through an IF trapping circuit (c), and RF-amplified by a MOSFETQ1, and through cascaded transistor (TR)Q2 and Q3 for a mixer, an IF output converted by a TRQ4 for oscillation is outputted to a terminal (b). High-frequency tuning coils L1-L2 are each switched between a high and a low band through a switching diode SWD. To coils of an input, an interstage and an oscillating tuning circuit, varactor diodes CD1 and CD2 are connected in parallel and in series respectively, and then varied by an output from a power terminal Bt for tuning. This constitution provides continuous reception of the CATV band of 120-300MHz.
JP8193080A 1980-06-16 1980-06-16 Electronic tuner Granted JPS577617A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8193080A JPS577617A (en) 1980-06-16 1980-06-16 Electronic tuner

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8193080A JPS577617A (en) 1980-06-16 1980-06-16 Electronic tuner

Publications (2)

Publication Number Publication Date
JPS577617A true JPS577617A (en) 1982-01-14
JPH0156567B2 JPH0156567B2 (en) 1989-11-30

Family

ID=13760180

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8193080A Granted JPS577617A (en) 1980-06-16 1980-06-16 Electronic tuner

Country Status (1)

Country Link
JP (1) JPS577617A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63178971U (en) * 1987-05-12 1988-11-18

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5210241U (en) * 1975-07-11 1977-01-24
JPS5215681U (en) * 1975-07-22 1977-02-03

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5210241U (en) * 1975-07-11 1977-01-24
JPS5215681U (en) * 1975-07-22 1977-02-03

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63178971U (en) * 1987-05-12 1988-11-18

Also Published As

Publication number Publication date
JPH0156567B2 (en) 1989-11-30

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