JPS5956841U - CATV tuner input circuit - Google Patents

CATV tuner input circuit

Info

Publication number
JPS5956841U
JPS5956841U JP14849182U JP14849182U JPS5956841U JP S5956841 U JPS5956841 U JP S5956841U JP 14849182 U JP14849182 U JP 14849182U JP 14849182 U JP14849182 U JP 14849182U JP S5956841 U JPS5956841 U JP S5956841U
Authority
JP
Japan
Prior art keywords
band
tuner
circuit
vhf
stages
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
JP14849182U
Other languages
Japanese (ja)
Inventor
勲 堀江
Original Assignee
日本電気ホームエレクトロニクス株式会社
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 日本電気ホームエレクトロニクス株式会社 filed Critical 日本電気ホームエレクトロニクス株式会社
Priority to JP14849182U priority Critical patent/JPS5956841U/en
Publication of JPS5956841U publication Critical patent/JPS5956841U/en
Pending legal-status Critical Current

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  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。
(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

【図面の簡単な説明】[Brief explanation of drawings]

第1図は本考案の前提であるCATVチューナのブロッ
クダイヤグラム、及び第2図は本考案の−CATVチュ
ーナの入力回路を示す要部回路図である。 21・・・・・・UHF帯域チューナ回路、22・旧・
・VHF帯高域チューナ回路、24・・・・・・UHF
帯餓動作電源端子、29.30・・・・・・VHF帯入
力側グイ、オード、31・・・・・・共通接続点、34
・・・・・・直流バイアス手段(抵抗)、36・・=・
・・バイアス抵抗。
FIG. 1 is a block diagram of a CATV tuner which is the premise of the present invention, and FIG. 2 is a circuit diagram of a main part showing an input circuit of the CATV tuner of the present invention. 21...UHF band tuner circuit, 22. Old.
・VHF band high frequency tuner circuit, 24...UHF
Band starvation operation power supply terminal, 29.30... VHF band input side guide, ode, 31... Common connection point, 34
...DC bias means (resistance), 36...=...
...Bias resistance.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] VHF帯高域及びVHF帯低域と共にUHF帯域の受信
信号をそれぞれ独立したRF増幅段、混合段及び局部発
振段を含むチューナ回路により処理し、前記VHF帯雨
域の異なる受信信号をそれぞれのチ、1−す回路の入力
側にダイオードを介挿しその導通により各チューナ回路
に結合するCATVチューナにおいて、前記しIHF帯
域の動作電源端子及び前記各ダイオードの共通接続点間
に直流バイアス手段を介挿して成り、UHF帯の受信に
際し、前記直流バイアス手段により前記各ダイオードを
逆方向バイアスしてVHF帯信号による受信妨害を排除
することを特徴とするCATVチューナの入力回路。
The received signals of the UHF band as well as the VHF band high band and VHF band low band are processed by tuner circuits including independent RF amplification stages, mixing stages, and local oscillation stages, and the different received signals of the VHF band are processed by the respective channels. In a CATV tuner in which a diode is inserted on the input side of the first circuit and connected to each tuner circuit through conduction, a DC bias means is inserted between the above-mentioned IHF band operating power supply terminal and the common connection point of each of the diodes. An input circuit for a CATV tuner, characterized in that when receiving a UHF band signal, each of the diodes is biased in a reverse direction by the DC bias means to eliminate reception interference caused by a VHF band signal.
JP14849182U 1982-09-30 1982-09-30 CATV tuner input circuit Pending JPS5956841U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14849182U JPS5956841U (en) 1982-09-30 1982-09-30 CATV tuner input circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14849182U JPS5956841U (en) 1982-09-30 1982-09-30 CATV tuner input circuit

Publications (1)

Publication Number Publication Date
JPS5956841U true JPS5956841U (en) 1984-04-13

Family

ID=30329898

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14849182U Pending JPS5956841U (en) 1982-09-30 1982-09-30 CATV tuner input circuit

Country Status (1)

Country Link
JP (1) JPS5956841U (en)

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