JPS63106217U - - Google Patents
Info
- Publication number
- JPS63106217U JPS63106217U JP20179686U JP20179686U JPS63106217U JP S63106217 U JPS63106217 U JP S63106217U JP 20179686 U JP20179686 U JP 20179686U JP 20179686 U JP20179686 U JP 20179686U JP S63106217 U JPS63106217 U JP S63106217U
- Authority
- JP
- Japan
- Prior art keywords
- band
- circuit
- vhf
- tuner
- uhf
- 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
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
Description
第１図は、この考案の一実施例に係る電子同調
チユーナのＶＨＦ入力回路回りを示す回路図であ
る。第２図は、従来の電子同調チユーナの一例を
示すブロツク図である。第３図は、第２図のＶＨ
Ｆ入力回路回りの一例を示す回路である。
１Ｖ……ＶＨＦチユーナ回路、１Ｕ……ＵＨＦ
チユーナ回路、２……入力回路、２ｂ……入力同
調回路、２ｃ……入力信号経路、Ｄ１，Ｄ２……
スイツチングダイオード、Ｄ４……バイパスダイ
オード、ＬＢ，ＨＢ，ＵＢ……電圧端子。
FIG. 1 is a circuit diagram showing the VHF input circuit of an electronically tuned tuner according to an embodiment of the invention. FIG. 2 is a block diagram showing an example of a conventional electronic tuning tuner. Figure 3 shows the VH of Figure 2.
This is a circuit showing an example of the F input circuit. 1V...VHF tuner circuit, 1U...UHF
tuner circuit, 2...input circuit, 2b...input tuning circuit, 2c...input signal path, D1 , D2 ...
Switching diode, D4 ... Bypass diode, LB, HB, UB... Voltage terminal.
Claims (1)
有し、ＶＨＦ受信時に、選局チヤンネルがローバ
ンドであるかハイバンドであるかに応じて、対応
する電圧端子からＶＨＦチユーナ回路の入力回路
中のスイツチングダイオードに、そのバイアス方
向が各バンドに応じて異なるように電圧を印加す
ることによつて所望のバンドを得るようにした電
子同調チユーナにおいて、前記入力回路における
入力信号経路であつて前記スイツチングダイオー
ドよりも前段側に、当該入力信号経路をアースす
るためのバイパスダイオードを接続し、ＶＨＦ受
信時に、そのバンド切替用の電圧端子に印加され
る電圧によつて当該バイパスダイオードを逆バイ
アスし、ＵＨＦ受信時に、ＵＨＦチユーナ回路に
供給される電圧によつて当該バイパスダイオード
を順バイアスするよう構成したことを特徴とする
電子同調チユーナ。 It has a VHF tuner circuit and a UHF tuner circuit, and when receiving VHF, depending on whether the selected channel is low band or high band, the corresponding voltage terminal is connected to the switching diode in the input circuit of the VHF tuner circuit. , in an electronic tuning tuner in which a desired band is obtained by applying a voltage such that the bias direction differs depending on each band, an input signal path in the input circuit, which is lower than the switching diode. A bypass diode for grounding the input signal path is connected to the front stage side, and when receiving VHF, the bypass diode is reverse biased by the voltage applied to the voltage terminal for band switching, and when receiving UHF, An electronic tuning tuner characterized in that the bypass diode is forward biased by the voltage supplied to the UHF tuner circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20179686U JPS63106217U (en) | 1986-12-25 | 1986-12-25 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20179686U JPS63106217U (en) | 1986-12-25 | 1986-12-25 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63106217U true JPS63106217U (en) | 1988-07-09 |
Family
ID=31165583
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20179686U Pending JPS63106217U (en) | 1986-12-25 | 1986-12-25 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63106217U (en) |
-
1986
- 1986-12-25 JP JP20179686U patent/JPS63106217U/ja active Pending
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