JPH0238835U - - Google Patents
Info
- 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
Links
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- Superheterodyne Receivers (AREA)
Description
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、Ｄ１……第１スイツチ
ングダイオード、Ｄ２……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)
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.
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) |
-
1988
- 1988-09-07 JP JP11751188U patent/JPH0238835U/ja active Pending
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