JPS59139718A - Tuning indicator - Google Patents
Tuning indicatorInfo
- Publication number
- JPS59139718A JPS59139718A JP1633784A JP1633784A JPS59139718A JP S59139718 A JPS59139718 A JP S59139718A JP 1633784 A JP1633784 A JP 1633784A JP 1633784 A JP1633784 A JP 1633784A JP S59139718 A JPS59139718 A JP S59139718A
- Authority
- JP
- Japan
- Prior art keywords
- diode
- intermediate frequency
- tuning
- transistor
- deflection
- 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.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J3/00—Continuous tuning
- H03J3/02—Details
- H03J3/12—Electrically-operated arrangements for indicating correct tuning
- H03J3/14—Visual indication, e.g. magic eye
Landscapes
- Circuits Of Receivers In General (AREA)
Abstract
Description
【発明の詳細な説明】
本発明はラジオ受信機、その他の無線機器に使用する同
調指示装置に係シ、簡単な構成でメータの偏れを大きく
とれる優れた同調指示装置を提供する仁とを目的とする
ものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tuning indicating device used in radio receivers and other wireless equipment, and is directed to the Company, which provides an excellent tuning indicating device with a simple configuration that can greatly reduce meter deviation. This is the purpose.
一般にラジオ受信機等において同調指示装置を構成する
場合には第１図に示すように中間周波増幅回路１の出力
端より中間周波信号の一部を取出し、これをダイオード
２，３、コンデンサ４，６等によって整流平滑し、同調
指示メータ６に直列に接続されたトランジスタ７に印加
するように構成している。しかしながら、この種のもの
では、メータ６の偏れが中間周波信号のレベル変化に対
して１対１に対応し余り大きな変化を得る仁とができな
いという問題があった。特に弱入力時にはダイオード２
，３がオフすることがあり、メータ６の偏れが著しく悪
くなるという問題があった。Generally, when constructing a tuning instruction device in a radio receiver or the like, as shown in FIG. The signal is rectified and smoothed by a transistor 6, etc., and applied to a transistor 7 connected in series to a tuning indicator meter 6. However, in this type of device, there is a problem that the deviation of the meter 6 corresponds one-to-one to the level change of the intermediate frequency signal, and it is not possible to obtain a large change. Especially when the input is weak, diode 2
, 3 may turn off, causing the problem that the deviation of the meter 6 becomes significantly worse.
本発明は以上のような従来の欠点を除去するものであり
簡単な構成でメータの偏れを大きくできる優れた同調指
示装置を提供するものである。The present invention eliminates the above-mentioned conventional drawbacks and provides an excellent tuning indicating device that can increase the deviation of the meter with a simple configuration.
以下本発明の同調指示装置について一実施例の図面とと
もに説明する。第２図は本発明の同調指示装置における
一実施例の電気的結線図であり、図中第１図と同一符号
を付したものは同一のものを示している。そして、第２
図に、おいて、８は中間周波数に共振するフィルター、
９は中間周波増幅回路１を構成するトランジスタ、１０
はトランジスタ９のコレクタに接続された中間周波トラ
ンス、１１はバイパスコンデンサ、１２．１３ｉｔ抵抗
、１４は検波用のダイオード、１６は結合コンデンサ、
１６．１７は抵抗である。DESCRIPTION OF THE PREFERRED EMBODIMENTS The tuning instruction device of the present invention will be described below with reference to drawings of one embodiment. FIG. 2 is an electrical wiring diagram of one embodiment of the tuning instruction device of the present invention, and the same reference numerals as in FIG. 1 indicate the same components. And the second
In the figure, 8 is a filter that resonates at the intermediate frequency;
9 is a transistor constituting the intermediate frequency amplification circuit 1; 10;
is an intermediate frequency transformer connected to the collector of transistor 9, 11 is a bypass capacitor, 12.13 it resistor, 14 is a detection diode, 16 is a coupling capacitor,
16.17 is the resistance.
上記実施例においてトランジスタ９０ペースには端子ａ
よシＡＢＣ電圧が印加される。ＡＧＣ電圧は入力が大き
くなったとき、トランジスタ９のペース、エミッタ間電
圧を低下させゲインを下げるように作用するためトラン
ジスタ９に流れる電流が小さくなり、そのコレクタ電位
が上昇することになる。したがって、この場合にはダイ
オード２によシ順方向のバイアスが加わることになり、
トランジスタ７にはよシ多ぐの電流が流れることになる
。そのため、メータ６の振れは従来のものより相当大き
くなる。一方弱入力時にはトランジスタ９のコレクタ電
位が低下し、ダイオード２に加わるバイアス電圧が低下
するが、従来のように無バイアスのものに比べると中間
周波出力の一部がダイオード２を通してよシ多くトラン
ジスタ７のベースに加わることになシ、この場合もメー
タの振れを従来のものよシよシ大きくすることができる
。In the above embodiment, the transistor 90 has a terminal a.
ABC voltage is applied. When the input becomes large, the AGC voltage acts to reduce the pace and emitter voltage of the transistor 9 and lower the gain, so the current flowing through the transistor 9 becomes smaller and its collector potential increases. Therefore, in this case, a forward bias is applied to diode 2,
A large amount of current will flow through the transistor 7. Therefore, the deflection of the meter 6 becomes considerably larger than that of the conventional meter. On the other hand, when the input is weak, the collector potential of the transistor 9 decreases and the bias voltage applied to the diode 2 decreases, but compared to the conventional non-biased one, a part of the intermediate frequency output passes through the diode 2 and is transferred to the transistor 7. By adding to the base of the meter, the deflection of the meter can be increased in this case as well compared to the conventional one.
以上実施例よシ明らかなように本発明の同調指示装置に
よれば、メータの振れを従来のものに比して相当大きく
することができ、同調指示をよシ判シやすくすることが
できる。特に本発明によれば、弱入力時でも充分に同調
指示を明確に行なわせることができ、実用上きわめて有
利なものである。As is clear from the above embodiments, according to the tuning instruction device of the present invention, the deflection of the meter can be made considerably larger than that of the conventional device, and the tuning instruction can be easily recognized. Particularly, according to the present invention, it is possible to give a clear tuning instruction even in the case of a weak input, which is extremely advantageous in practice.
第１図は従来の同調指示装置の電気的結線図、第２図は
本発明の同調指示装置における一実施例の電気的結線図
である。
１・・・・・・中間周波増幅回路、２．３・・・・・・
ダイオード、４，６・・・・・・コンデンサ、６・・・
・・・同調指示メータ、７，９・・・・・・トランジス
タ。
代理人の氏名 弁理士 中 尾 敏 男 ほか１名第１
図
窮２図FIG. 1 is an electrical connection diagram of a conventional tuning instruction device, and FIG. 2 is an electrical connection diagram of an embodiment of the tuning instruction device of the present invention. 1...Intermediate frequency amplification circuit, 2.3...
Diode, 4, 6... Capacitor, 6...
...Tuning indicator meter, 7,9...Transistor. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2
Claims (1)
し、その出力によって同調指示メータに直列に接続され
たトランジスタを駆動するように構成すると共にＡＧＣ
電圧が印加される上記中間周波増幅回路のトランジスタ
におけるコレクタ電位を上記ダイオードのバイアス電圧
として印加するように構成して成る同調指示装置。The output of the intermediate frequency amplification circuit is rectified and smoothed through a diode, and the output is configured to drive a transistor connected in series to a tuning indicator meter.
A tuning instruction device configured to apply a collector potential of a transistor of the intermediate frequency amplification circuit to which a voltage is applied as a bias voltage to the diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1633784A JPS59139718A (en) | 1984-01-30 | 1984-01-30 | Tuning indicator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1633784A JPS59139718A (en) | 1984-01-30 | 1984-01-30 | Tuning indicator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59139718A true JPS59139718A (en) | 1984-08-10 |
| JPS6244445B2 JPS6244445B2 (en) | 1987-09-21 |
Family
ID=11913598
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1633784A Granted JPS59139718A (en) | 1984-01-30 | 1984-01-30 | Tuning indicator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59139718A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS452405Y1 (en) * | 1967-07-07 | 1970-01-31 | ||
| JPS5233767U (en) * | 1975-08-30 | 1977-03-09 |
-
1984
- 1984-01-30 JP JP1633784A patent/JPS59139718A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS452405Y1 (en) * | 1967-07-07 | 1970-01-31 | ||
| JPS5233767U (en) * | 1975-08-30 | 1977-03-09 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6244445B2 (en) | 1987-09-21 |
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