JPS551771A - Tuner unit for television - Google Patents

Tuner unit for television

Info

Publication number
JPS551771A
JPS551771A JP7507578A JP7507578A JPS551771A JP S551771 A JPS551771 A JP S551771A JP 7507578 A JP7507578 A JP 7507578A JP 7507578 A JP7507578 A JP 7507578A JP S551771 A JPS551771 A JP S551771A
Authority
JP
Japan
Prior art keywords
reception
operated
diode
uhf
mixer
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
JP7507578A
Other languages
Japanese (ja)
Inventor
Tsutomu Nikudo
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 JP7507578A priority Critical patent/JPS551771A/en
Publication of JPS551771A publication Critical patent/JPS551771A/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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Superheterodyne Receivers (AREA)

Abstract

PURPOSE:To operate the transistor always at best cindition, which is operated as a mixer in case of VHF reception and is operated as IF amplifier at UHF reception, by providing diode. CONSTITUTION:At VHF reception, the selector switch S is selected to a position, and the television signal from the terminal 1 is inputted to TR11 in which the transistor TR11 is set at efficient operating point as a mixer consisting of the resistors 16,17 and the emitter resistor. On the other hand, at UHF reception, the switch S is set to position b, and the intermediate frequency signal of UHF tuner 22 passes through the resistor 31 and it is fed to TR 11 via the diode 32. With this constitution, at VHF reception, the diode 32 is non-conductive because the cathode is back biased with the bias of TR11, and TR11 can be operated at best condition as a mixer. Further, at UHF reception, the diode 32 is conductive, and TR11 can be operated at best condition as IF amplifier by suitably setting the resistor 31.
JP7507578A 1978-06-20 1978-06-20 Tuner unit for television Pending JPS551771A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7507578A JPS551771A (en) 1978-06-20 1978-06-20 Tuner unit for television

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7507578A JPS551771A (en) 1978-06-20 1978-06-20 Tuner unit for television

Publications (1)

Publication Number Publication Date
JPS551771A true JPS551771A (en) 1980-01-08

Family

ID=13565695

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7507578A Pending JPS551771A (en) 1978-06-20 1978-06-20 Tuner unit for television

Country Status (1)

Country Link
JP (1) JPS551771A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52421U (en) * 1975-05-19 1977-01-05

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52421U (en) * 1975-05-19 1977-01-05

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