JPH02137124U - - Google Patents
Info
- Publication number
- JPH02137124U JPH02137124U JP1989045235U JP4523589U JPH02137124U JP H02137124 U JPH02137124 U JP H02137124U JP 1989045235 U JP1989045235 U JP 1989045235U JP 4523589 U JP4523589 U JP 4523589U JP H02137124 U JPH02137124 U JP H02137124U
- Authority
- JP
- Japan
- Prior art keywords
- band
- terminal
- resonant coil
- resonant
- vhf
- 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
- 239000003990 capacitor Substances 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 6
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よるオールバン
ドチユーナの要部の構成を示す回路図、第２図は
ＵＨＦ帯のＴＶ信号受信時の第１図の等価回路図
、第３図はＶＨＦ帯のハイバンドのＴＶ信号受信
時の第１図の等価回路図、第４図は第３図におい
て共振コイル５およびコンデンサ２１の影響を無
視した場合の等価回路図、第５図は第３図におい
てイメージ帯における等価回路図、第６図は従来
のオールバンドチユーナの要部の構成例を示す回
路図である。
２１……コンデンサ、２２……コイル。
Fig. 1 is a circuit diagram showing the configuration of the main parts of an all-band tuner according to an embodiment of this invention, Fig. 2 is an equivalent circuit diagram of Fig. 1 when receiving a UHF band TV signal, and Fig. 3 is a VHF band tuner. Fig. 1 is an equivalent circuit diagram when receiving a high band TV signal, Fig. 4 is an equivalent circuit diagram when the influence of the resonant coil 5 and capacitor 21 in Fig. 3 is ignored, and Fig. 5 is an equivalent circuit diagram as shown in Fig. 3. FIG. 6 is a circuit diagram showing an example of the configuration of the main parts of a conventional all-band tuner. 21... Capacitor, 22... Coil.
Claims (1)
増幅するトランジスタと、第１の端子が前記トラ
ンジスタのコレクタに接続されたＵＨＦ帯の第１
の共振コイルと、第１の端子が前記第１の共振コ
イルの第２の端子に接続されたＶＨＦ帯のハイバ
ンドの第２の共振コイルと、カソードが前記第１
の共振コイルの前記第１の端子に接続され、アノ
ードが接地された可変容量ダイオードとを具備し
、前記ＵＨＦ帯のテレビジヨン信号受信時には前
記第１の共振コイルの前記第２の端子が接地され
、前記ＶＨＦ帯のハイバンドのテレビジヨン信号
受信時には前記第２の共振コイルの第２の端子が
接地されるオールバンドチユーナにおいて、前記
コレクタと前記第１の共振コイルの前記第１の端
子との間にコンデンサを介挿し、前記コレクタと
前記第１の共振コイルの前記第２の端子との間に
コイルを介挿し、前記コンデンサおよび前記コイ
ルによつて構成される共振回路の共振周波数を前
記ＵＨＦ帯と前記ＶＨＦ帯との間であつて前記Ｕ
ＨＦ帯近傍の周波数とすることを特徴とするオー
ルバンドチユーナ。 a transistor for amplifying television signals in the VHF band and the UHF band; and a first transistor in the UHF band whose first terminal is connected to the collector of the transistor.
a second resonant coil of VHF high band whose first terminal is connected to the second terminal of the first resonant coil;
a variable capacitance diode connected to the first terminal of the resonant coil, the anode of which is grounded, and when receiving the UHF band television signal, the second terminal of the first resonant coil is grounded. , in the all-band tuner in which the second terminal of the second resonant coil is grounded when receiving a high-band television signal of the VHF band, the collector and the first terminal of the first resonant coil are connected to each other; A capacitor is inserted between the collector and the second terminal of the first resonant coil, and a resonant frequency of a resonant circuit constituted by the capacitor and the coil is set to the between the UHF band and the VHF band;
An all-band tuner characterized by a frequency near the HF band.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1989045235U JPH02137124U (en) | 1989-04-18 | 1989-04-18 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1989045235U JPH02137124U (en) | 1989-04-18 | 1989-04-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02137124U true JPH02137124U (en) | 1990-11-15 |
Family
ID=31559227
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1989045235U Pending JPH02137124U (en) | 1989-04-18 | 1989-04-18 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02137124U (en) |
-
1989
- 1989-04-18 JP JP1989045235U patent/JPH02137124U/ja active Pending
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