JPS6353741B2 - - Google Patents
Info
- Publication number
- JPS6353741B2 JPS6353741B2 JP10111884A JP10111884A JPS6353741B2 JP S6353741 B2 JPS6353741 B2 JP S6353741B2 JP 10111884 A JP10111884 A JP 10111884A JP 10111884 A JP10111884 A JP 10111884A JP S6353741 B2 JPS6353741 B2 JP S6353741B2
- Authority
- JP
- Japan
- Prior art keywords
- high frequency
- short
- waves
- frequency circuit
- external antenna
- 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
- 230000005669 field effect Effects 0.000 description 10
- 239000003990 capacitor Substances 0.000 description 6
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 1
- 238000009429 electrical wiring Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/18—Input circuits, e.g. for coupling to an antenna or a transmission line
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
Description
【発明の詳細な説明】
産業上の利用分野
本発明は超短波帯の放送と短波帯の放送の両方
を受信できるラジオ受信機に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a radio receiver capable of receiving both very high frequency band broadcasts and short wave band broadcasts.
従来例の構成とその問題点
一般に超短波帯の放送と短波帯の放送の両方を
受信できるラジオ受信機ではアンテナとしてロツ
ドアンテナが内蔵されており、その他に外部アン
テナを接続するための外部アンテナ端子が設けら
れている。ところで、この場合、内蔵されたロツ
ドアンテナは通常超短波帯に整合するように構成
されており、短波帯に対しては非常に高いインピ
ーダンスを呈している。そのため外部アンテナ端
子を内蔵されたロツドアンテナに直接接続すると
短波帯に対して大きな不整合を示すことになり短
波帯に対しては外部アンテナが有効に働き得ない
という問題があつた。Conventional configurations and their problems Radio receivers that can receive both very high frequency band broadcasts and short wave band broadcasts generally have a built-in rod antenna as an antenna, and are also equipped with an external antenna terminal for connecting an external antenna. It is being Incidentally, in this case, the built-in rod antenna is usually configured to match the ultra-high frequency band, and exhibits a very high impedance to the short wave band. Therefore, if the external antenna terminal is directly connected to the built-in rod antenna, there is a problem that a large mismatch occurs in the short wave band, and the external antenna cannot work effectively in the short wave band.
発明の目的
本発明は、内蔵されたロツドアンテナと別に取
付ける外部アンテナとをそれぞれの受信周波数帯
域に応じて最適な条件で使用できる優れたラジオ
受信機を提供することを目的とするものである。OBJECTS OF THE INVENTION An object of the present invention is to provide an excellent radio receiver that can use a built-in rod antenna and a separately attached external antenna under optimal conditions according to each receiving frequency band.
発明の構成
本発明のラジオ受信機は、超短波帯に対しては
同程度のインピーダンスを呈するロツドアンテナ
と外部アンテナを同一の短波用高周波回路に接続
し、短波帯に対してはそれぞれのアンテナをそれ
ぞれのインピーダンスに整合し得る短波用高周波
回路の別々の部分に接続するように構成したもの
である。Structure of the Invention The radio receiver of the present invention connects a rod antenna and an external antenna, which exhibit the same impedance for very short wave bands, to the same high frequency circuit for short waves. It is configured to be connected to different parts of a short wave high frequency circuit whose impedance can be matched.
実施例の説明
以下、本発明のラジオ受信機について一実施例
の図面とともに説明する。図において、１は内蔵
されたロツドアンテナ、２は外部アンテナを接続
するための外部アンテナ端子、３は超短波用の高
周波回路、４はバンド切換用スイツチ、５は電源
である。そして、Q1は短波用の高周波回路を構
成する電界効果型トランジスタであり、C1，C5
はバイパスコンデンサ、C2，C3，C4，C6は結合
コンデンサ、R1，R2，R3，R4は抵抗、D1，D2は
スイツチング用のダイオードである。DESCRIPTION OF EMBODIMENTS Hereinafter, a radio receiver of the present invention will be described with reference to drawings of one embodiment. In the figure, 1 is a built-in rod antenna, 2 is an external antenna terminal for connecting an external antenna, 3 is a high frequency circuit for very short waves, 4 is a band switching switch, and 5 is a power source. Q 1 is a field effect transistor that constitutes a short wave high frequency circuit, and C 1 , C 5
is a bypass capacitor, C 2 , C 3 , C 4 , and C 6 are coupling capacitors, R 1 , R 2 , R 3 , and R 4 are resistors, and D 1 and D 2 are switching diodes.
上記実施例において、切換スイツチ４を超短波
側端子ａに投入したとすると電源５の電圧が抵抗
R1，R3を介してスイツチング用ダイオードD1，
D2に順方向に印加されるため上記ダイオードD1，
D2は共にオンになる。したがつてロツドアンテ
ナ１と外部アンテナ端子２とが交流的にコンデン
サC3，C6、ダイオードD2を通して互に接続され
ることになり、更にダイオードD1、コンデンサ
C2を通して超短波用の高周波回路３に接続され
ることになる。そのため、この状態ではロツドア
ンテナ１又は外部アンテナ端子２に接続された外
部アンテナからの信号が共に超短波用の高周波回
路３に印加されることになる。 In the above embodiment, if the changeover switch 4 is turned on to the very short wave side terminal a, the voltage of the power source 5 will be
Switching diode D 1 via R 1 , R 3 ,
Since the voltage is applied to D 2 in the forward direction, the above diode D 1 ,
D 2 are both turned on. Therefore, the rod antenna 1 and the external antenna terminal 2 are connected to each other in an alternating current manner through the capacitors C 3 and C 6 and the diode D 2 , and further through the diode D 1 and the capacitor.
It will be connected to the high frequency circuit 3 for very short waves through C2 . Therefore, in this state, signals from the rod antenna 1 or the external antenna connected to the external antenna terminal 2 are both applied to the high frequency circuit 3 for very short waves.
今、端スイツチ４を短波側端子ｂに投入したと
すると、電源５の電圧が電界効果型トランジスタ
Q1のドレインに印加された電界効果型トランジ
スタQ1のドレイン，ソース間に電流が流れるよ
うになる。したがつてソース電位が正電位になり
スイツチング用のダイオードD1，D2は共にオフ
することになる。そのため、この場合にはロツド
アンテナ１と外部アンテナ端子２とスイツチング
用ダイオードD2によつて完全に分離されること
になり、更にスイツチング用ダイオードD1によ
つて超短波用の高周波回路３とも完全に分離され
ることになる。そして、この場合にはロツドアン
テナ１からの信号が結合コンデンサC3，C4を介
して入力インピーダンスの大きい電界効果型トラ
ンジスタQ1のゲートに印加されることになり、
外部アンテナ端子２からの信号が結合コンデンサ
C6を介して出力インピーダンスの小さい電界効
果型トランジスタQ1のソースに印加されること
になる。したがつてロツドアンテナ１は先に述べ
たように短波帯において大きなインピーダンスを
呈するが電界効果型トランジスタQ1の入力イン
ピーダンスも大きな値を呈するので両者間で充分
な整合をとることができる。そして外部アンテナ
端子に短波帯の波長に合つた低インピーダンスの
外部アンテナを接続した場合でも電界効果型トラ
ンジスタQ1のソースにおけるインピーダンスも
非常に小さい値を呈する両者間で充分な整合をと
ることができる。 Now, if the end switch 4 is turned on to the short wave side terminal b, the voltage of the power supply 5 will change to the field effect transistor.
Current begins to flow between the drain and source of the field effect transistor Q 1 applied to the drain of Q 1 . Therefore, the source potential becomes positive, and both switching diodes D 1 and D 2 are turned off. Therefore, in this case, they are completely separated by the rod antenna 1, external antenna terminal 2 , and switching diode D2 , and are also completely separated from the ultrahigh frequency circuit 3 by the switching diode D1. will be done. In this case, the signal from the rod antenna 1 is applied to the gate of the field effect transistor Q 1 , which has a large input impedance, via the coupling capacitors C 3 and C 4 .
The signal from external antenna terminal 2 is connected to the coupling capacitor
It is applied to the source of the field effect transistor Q1 , which has a small output impedance, via C6 . Therefore, as mentioned above, the rod antenna 1 exhibits a large impedance in the short wave band, but since the input impedance of the field effect transistor Q1 also exhibits a large value, sufficient matching can be achieved between the two. Even when a low-impedance external antenna that matches the wavelength of the short wave band is connected to the external antenna terminal, the impedance at the source of field-effect transistor Q1 also exhibits a very small value, and sufficient matching can be achieved between the two. .
尚、実施例では短波用の高周波回路として電界
効果型トランジスタによるソースフオロア回路を
用いているが電界効果型トランジスタに代えてバ
イポーラ，トランジスタを使用しそのトランジス
タによるミツタフオロアー回路を用いることも可
能である。 In the embodiment, a source follower circuit using a field effect transistor is used as a short wave high frequency circuit, but it is also possible to use a bipolar transistor instead of the field effect transistor and use a Mitsutha follower circuit using the transistor.
発明の効果
以上実施例より明らかなように本発明のラジオ
受信機によれば超短波帯の放送や短波帯の放送を
受信する場合にそれぞれ最適の整合状態を得るこ
とができ、常に感度のよい受信状態を得ることが
できるという利点を有する。Effects of the Invention As is clear from the above embodiments, according to the radio receiver of the present invention, when receiving broadcasts in the ultrahigh frequency band and broadcasts in the short wave band, an optimal matching state can be obtained, and reception with high sensitivity is always achieved. It has the advantage of being able to obtain the state.
図は本発明のラジオ受信機における一実施例の
電気的結線図である。
１……ロツドアンテナ、２……外部アンテナ端
子、３……超短波用高周波回路、４……切換スイ
ツチ、５……電源、Q1……短波用高周波回路を
構成する電界効果型トランジスタ。
The figure is an electrical wiring diagram of an embodiment of the radio receiver of the present invention. 1... Rod antenna, 2... External antenna terminal, 3... High frequency circuit for very short waves, 4... Selector switch, 5... Power supply, Q1 ... Field effect transistor constituting the high frequency circuit for short waves.
Claims (1)
両方が受信可能なラジオ受信機であつて、入力イ
ンピーダンスが大きく出力インピーダンスの小さ
い回路手段よりなる短波用高周波回路と、この短
波用高周波回路の出力端に接続された外部アンテ
ナ端子と、上記短波用高周波回路の入力端に接続
されたロツドアンテナと、上記切換スイツチによ
る超短波受信時に作動され、上記外部アンテナ端
子およびロツドアンテナを共に超短波用高周波回
路の同一の入力端に接続するスイツチング回路と
を備えたラジオ受信機。1 A radio receiver capable of receiving both very high frequency waves and short waves by switching a changeover switch, which is connected to a short wave high frequency circuit consisting of circuit means with large input impedance and small output impedance, and to the output end of this short wave high frequency circuit. The external antenna terminal and the rod antenna connected to the input end of the high frequency circuit for short waves are activated when the changeover switch receives ultra high frequency waves, and the external antenna terminal and the rod antenna are connected to the same input end of the high frequency circuit for short waves. A radio receiver equipped with a switching circuit to be connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59101118A JPS59229932A (en) | 1984-05-18 | 1984-05-18 | radio receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59101118A JPS59229932A (en) | 1984-05-18 | 1984-05-18 | radio receiver |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59229932A JPS59229932A (en) | 1984-12-24 |
| JPS6353741B2 true JPS6353741B2 (en) | 1988-10-25 |
Family
ID=14292158
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59101118A Granted JPS59229932A (en) | 1984-05-18 | 1984-05-18 | radio receiver |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59229932A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6440357A (en) * | 1987-07-23 | 1989-02-10 | Siemens Ag | Thermal printer |
-
1984
- 1984-05-18 JP JP59101118A patent/JPS59229932A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6440357A (en) * | 1987-07-23 | 1989-02-10 | Siemens Ag | Thermal printer |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59229932A (en) | 1984-12-24 |
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