JPS6233388Y2 - - Google Patents
Info
- Publication number
- JPS6233388Y2 JPS6233388Y2 JP1980109325U JP10932580U JPS6233388Y2 JP S6233388 Y2 JPS6233388 Y2 JP S6233388Y2 JP 1980109325 U JP1980109325 U JP 1980109325U JP 10932580 U JP10932580 U JP 10932580U JP S6233388 Y2 JPS6233388 Y2 JP S6233388Y2
- Authority
- JP
- Japan
- Prior art keywords
- band
- output
- tuning
- ledl
- intermediate frequency
- 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.)
- Expired
Links
Landscapes
- Circuits Of Receivers In General (AREA)
Description
【考案の詳細な説明】
本考案はラジオ受信機の同調指示装置に関す
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tuning instruction device for a radio receiver.
最近のラジオ受信機に於いては、第１図に示す
ように複数のLEDL1〜L5を配列して設け受信電
界強度に応じた出力を発生する駆動IC１で順次
点灯させることにより、受信状態を指示するよう
構成されているが、最適同調点がなかなか捜し難
いという欠点があつた。 In recent radio receivers, as shown in Figure 1, a plurality of LEDs L 1 to L 5 are arranged in an array, and the reception status is determined by sequentially lighting them up using a drive IC 1 that generates an output according to the received field strength. However, it has the drawback that it is difficult to find the optimal tuning point.
従つて本考案はこの点に鑑みなされたもので、
最適同調点を簡単なる構成で指示することができ
る同調指示装置を提供するものである。 Therefore, the present invention was devised in view of this point.
An object of the present invention is to provide a tuning instruction device that can indicate the optimum tuning point with a simple configuration.
以下本考案の実施例を第２図と共に説明する。
L6は前述の駆動IC１の出力にアノード電極が接
続され、カソード電極がスイツチングトランジス
タ２のコレクタに接続されたLEDで、最適同調
点を指示するよう作用する。３はAMバンドの中
間周波増幅段４より中間周波信号が入力されたト
ランジスタで、エミツタと接地間に接続されたセ
ラミツクフイルター５により、増幅される中間周
波信号の帯域制限を行なうよう構成されている。
６は帯域制限された中間周波数信号出力を整流す
る整流回路で、整流出力が前記スイツチングトラ
ンジスタ２のベースに導かれている。 An embodiment of the present invention will be described below with reference to FIG.
L6 is an LED whose anode electrode is connected to the output of the aforementioned driving IC 1 and whose cathode electrode is connected to the collector of the switching transistor 2, and acts to indicate the optimum tuning point. 3 is a transistor to which an intermediate frequency signal is input from the AM band intermediate frequency amplification stage 4, and is configured to limit the band of the intermediate frequency signal to be amplified by a ceramic filter 5 connected between the emitter and ground. .
A rectifier circuit 6 rectifies the band-limited intermediate frequency signal output, and the rectified output is led to the base of the switching transistor 2.
次に斯る構成よりなる本考案の動作につき説明
する。同調操作が行なわれると、受信電界強度に
応じLEDL1〜L5は順次点灯され最適同調点に近
づいた事を指示するが、LEDL6は駆動IC１の同
じ出力に接続されたLEDL3が点灯されたとして
も、セラミツクフイルター５で設定された帯域外
の場合、整流回路６からスイツチングトランジス
タ２を十分導通させるだけの出力が発生されない
為、スイツチングトランジスタ２は非導通で
LEDL6は点灯されず、最適同調点でないことが
分る。そこで更に同調操作を行ないセラミツクフ
イルター５で設定された帯域になると、整流回路
６より出力が発生され、スイツチングトランジス
タ２が導通されることにより、LEDL6が点灯さ
れ最適同調点に到達したことを指示する。即ちこ
のLEDL6は設定された電界強度以上で且つ設定
された帯域内になつた時のみ点灯される為、確実
に最適同調点を指示することが出来る。 Next, the operation of the present invention having such a configuration will be explained. When the tuning operation is performed, LEDL 1 to L 5 are lit in sequence according to the received electric field strength to indicate that the optimum tuning point has been reached, but LEDL 6 is lit while LEDL 3 connected to the same output of drive IC 1 is lit. Even if the output is outside the band set by the ceramic filter 5, the rectifier circuit 6 will not generate enough output to make the switching transistor 2 conductive, so the switching transistor 2 will be non-conductive.
LEDL 6 is not lit, indicating that it is not at the optimal tuning point. Then, further tuning operation is performed, and when the band reaches the set value by the ceramic filter 5, an output is generated from the rectifier circuit 6, and the switching transistor 2 is turned on, causing the LEDL 6 to light up, indicating that the optimum tuning point has been reached. Instruct. In other words, this LEDL 6 is lit only when the electric field strength exceeds the set value and falls within the set band, so it is possible to reliably indicate the optimum tuning point.
尚、実施例ではLEDL6のアノード電極を
LEDL3と並列に接続したが、これに限らず所望
のレベルで点灯するようLEDL1〜L5の何れかに
接続すれば良い。又、FMバンドよりの帯域制限
された例えばミユーテイング信号をダイオード７
を介してスイツチングトランジスタ２のベースに
入力すればFMバンドについても同様に適用でき
る。 In addition, in the example, the anode electrode of LEDL 6 is
Although it is connected in parallel with LEDL 3 , the connection is not limited thereto, and it may be connected to any one of LEDL 1 to L 5 so as to turn on at a desired level. Also, for example, a muting signal that is band-limited from the FM band is connected to the diode 7.
The same can be applied to the FM band by inputting the signal to the base of the switching transistor 2 via the FM band.
上述の如く本考案の同調指示装置は、所定の電
界強度で且つ帯域制限された中間周波信号が所定
レベル以上になつた時のみLEDが点灯され同調
点を指示するもので、簡単な回路構成にて最適同
調点を容易に捜すことができ極めて実用的効果大
なるものである。 As mentioned above, in the tuning indicating device of the present invention, the LED is turned on to indicate the tuning point only when the band-limited intermediate frequency signal with a predetermined electric field strength exceeds a predetermined level, and the device has a simple circuit configuration. The optimum tuning point can be easily searched for, which has a great practical effect.
第１図は従来の同調指示装置の構成を示す図、
第２図は本考案の同調指示装置を示す図である。
１……IC、４……AMバンド中間周波増幅段、
５……セラミツクフイルター、６……整流回路。
FIG. 1 is a diagram showing the configuration of a conventional tuning instruction device,
FIG. 2 is a diagram showing the tuning instruction device of the present invention. 1...IC, 4...AM band intermediate frequency amplification stage,
5... Ceramic filter, 6... Rectifier circuit.
Claims (1)
を発生する手段と、帯域制限された中間周波信号
が所定レベル以上になつた時出力を発生する手段
と、前記両手段の出力が同時に発生された時点灯
される表示手段で構成したことを特徴とする同調
指示装置。 means for generating an output when the received electric field strength exceeds a predetermined level; means for generating an output when the band-limited intermediate frequency signal exceeds a predetermined level; and the outputs of both means are generated simultaneously. What is claimed is: 1. A tuning instruction device comprising display means that lights up when the time comes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1980109325U JPS6233388Y2 (en) | 1980-07-31 | 1980-07-31 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1980109325U JPS6233388Y2 (en) | 1980-07-31 | 1980-07-31 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5734720U JPS5734720U (en) | 1982-02-24 |
| JPS6233388Y2 true JPS6233388Y2 (en) | 1987-08-26 |
Family
ID=29470527
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1980109325U Expired JPS6233388Y2 (en) | 1980-07-31 | 1980-07-31 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6233388Y2 (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5219401B2 (en) * | 1971-09-27 | 1977-05-27 |
-
1980
- 1980-07-31 JP JP1980109325U patent/JPS6233388Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5734720U (en) | 1982-02-24 |
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