JPH0238835U - - Google Patents

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Publication number
JPH0238835U
JPH0238835U JP11751188U JP11751188U JPH0238835U JP H0238835 U JPH0238835 U JP H0238835U JP 11751188 U JP11751188 U JP 11751188U JP 11751188 U JP11751188 U JP 11751188U JP H0238835 U JPH0238835 U JP H0238835U
Authority
JP
Japan
Prior art keywords
vhf
switching
switching diode
signal path
band
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
JP11751188U
Other languages
Japanese (ja)
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 filed Critical
Priority to JP11751188U priority Critical patent/JPH0238835U/ja
Publication of JPH0238835U publication Critical patent/JPH0238835U/ja
Pending legal-status Critical Current

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  • Superheterodyne Receivers (AREA)

Description

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

第1図は本考案を実施したVHF入力回路を示
す回路図である。第2図は従来例の回路図である
。 1……UHFチユーナ部、2……VHFチユー
ナ部、3……アンテナ入力端子、8……VHF入
力回路、10……ミキサ、D……第1スイツチ
ングダイオード、D……第2スイツチングダイ
オード。
FIG. 1 is a circuit diagram showing a VHF input circuit embodying the present invention. FIG. 2 is a circuit diagram of a conventional example. 1...UHF tuner section, 2...VHF tuner section, 3...Antenna input terminal, 8...VHF input circuit, 10...Mixer, D1 ...First switching diode, D2 ...Second switch diode.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] UHF受信時にVHFチユーナ部のミキサをI
F増幅器として使用する形式のチユーナにおける
VHF入力回路において、帯域切換え用の第1ス
イツチングダイオードの一端にハイレベルとロー
レベルの電圧をVHF受信時とUHF受信時に切
換えて印加する第1印加手段と、前記第1スイツ
チングダイオードの他端にハイレベルとローレベ
ルの電圧をVHFローバンドとVHFハイバンド
に応じて切換えて印加する第2印加手段と、VH
F信号路に挿入されオフのときVHF信号路を遮
断するように作用する第2スイツチングダイオー
ドと、VHF受信時に該第2スイツチングダイオ
ードをオンするため該スイツチングダイオードの
一端に前記第1印加手段からの電圧を導びく手段
とから成るVHF入力回路。
When receiving UHF, set the VHF tuner mixer to I.
In a VHF input circuit in a tuner of a type used as an F amplifier, a first applying means applies a high-level voltage and a low-level voltage to one end of a first switching diode for band switching while switching between VHF reception and UHF reception; , a second applying means for switching and applying high level and low level voltages to the other end of the first switching diode according to the VHF low band and the VHF high band;
a second switching diode inserted into the F signal path and acting to cut off the VHF signal path when the VHF signal path is off; and a first voltage applied to one end of the switching diode to turn on the second switching diode when receiving VHF. and means for directing voltage from the VHF input circuit.
JP11751188U 1988-09-07 1988-09-07 Pending JPH0238835U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11751188U JPH0238835U (en) 1988-09-07 1988-09-07

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11751188U JPH0238835U (en) 1988-09-07 1988-09-07

Publications (1)

Publication Number Publication Date
JPH0238835U true JPH0238835U (en) 1990-03-15

Family

ID=31361031

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11751188U Pending JPH0238835U (en) 1988-09-07 1988-09-07

Country Status (1)

Country Link
JP (1) JPH0238835U (en)

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