JPS6236363Y2 - - Google Patents
Info
- Publication number
- JPS6236363Y2 JPS6236363Y2 JP11322381U JP11322381U JPS6236363Y2 JP S6236363 Y2 JPS6236363 Y2 JP S6236363Y2 JP 11322381 U JP11322381 U JP 11322381U JP 11322381 U JP11322381 U JP 11322381U JP S6236363 Y2 JPS6236363 Y2 JP S6236363Y2
- Authority
- JP
- Japan
- Prior art keywords
- coil
- band
- circuit
- oscillation
- switch
- 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
- 230000010355 oscillation Effects 0.000 claims description 17
- 239000003990 capacitor Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Landscapes
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
- Superheterodyne Receivers (AREA)
- Circuits Of Receivers In General (AREA)
Description
【考案の詳細な説明】
本考案はAM受信機におけるMWバンドとLW
バンドの切換を２メークの安価なリレースイツチ
を使用することにより、安定で安価な２バンド切
換回路に関するものである。[Detailed explanation of the invention] This invention is based on the MW band and LW in AM receiver.
This invention relates to a stable and inexpensive two-band switching circuit that uses two sets of inexpensive relay switches for band switching.
第１図に従来の代表的なAM受信機のMW／
LW2バンド切換回路例を示すものである。アン
テナ同調回路をMWバンド用コイルL1とLWバン
ド用コイルL2を接続して構成し、発振回路をMW
バンド用コイルL3とLWバンド用コイルL4を接続
してなるAM受信機において、バンドセレクトス
イツチSW1がMW（例えば530〜1650kHz）側（図
示ａ）に切換つた時に、アンテナ同調側は高速ス
イツチリング用ダイオードD1，D2，D3，D5がON
してコイルL2がアース接続し、可変容量ダイオ
ードVC1とコイルL1で同調回路が形成され、発振
側は高速スイツチング用ダイオードD5，D6，
D9，D10がONしてコイルL4が無効となり、可変
容量ダイオードVC2、パデイングコンデンサ
PC1、コイルL3で発振回路を形成し、M1X回路へ
はダイオードD5を通つて導入される。バンドセ
レクトスイツチSW1がLW（146〜353kHz）側
（図示ｂ）に切換つた時に、アンテナ同調側は可
変容量ダイオードVC1とコイルL1＋コイルL2で同
調回路が形成され、発振側は可変容量ダイオード
VC2とコイルL3＋コイルL4で発振回路を形成す
る。この場合、バンドセレクトスイツチSW1がａ
側に切換つた時にコイルL2、コイルL4を高周波
アースする。高速スイツチング用ダイオード
D2，D3，D9のON抵抗が温度とバイアス電流に対
して不安定であり、バンドセレクトスイツチSW1
がｂ側に切換つた時に高速スイツチング用ダイオ
ードD5をスイツチする時に流す電流をアースに
落す抵抗Ｒが数100kΩ以下と小さい時、発振回
路をＱダンプして、発振振巾の不安定、発振停止
を起すことがあり、これが大きくなるとダイオー
ドD5を温度変化、部品のバラツキが少なく、安
定してスイツチすることが難しくなる欠点があつ
た。実験的にはＲは200〜300kΩがダイオードD5
のスイツチ動作させ得る限界である。ただし発振
安定性としては1MΩでも振巾縮少、発振停止が
起つた。又ダイオードD2，D3はトラツキングや
感度不安定の原因となる欠点があつた。 Figure 1 shows the MW/
This shows an example of an LW2 band switching circuit. The antenna tuning circuit is configured by connecting coil L 1 for MW band and coil L 2 for LW band, and the oscillation circuit is configured by connecting coil L 1 for MW band and coil L 2 for LW band.
In an AM receiver configured by connecting band coil L 3 and LW band coil L 4 , when band select switch SW 1 is switched to the MW (for example, 530 to 1650 kHz) side (a in the figure), the antenna tuning side is set at high speed. Switching diodes D 1 , D 2 , D 3 , D 5 are ON
The coil L 2 is grounded, and a tuned circuit is formed by the variable capacitance diode VC 1 and the coil L 1. On the oscillation side, high-speed switching diodes D 5 , D 6 ,
D 9 and D 10 are turned on, coil L 4 is disabled, and variable capacitance diode VC 2 and padding capacitor are
PC 1 and coil L 3 form an oscillation circuit, and it is introduced into the M 1 X circuit through diode D 5 . When the band select switch SW 1 is switched to the LW (146 to 353kHz) side (b in the figure), a tuning circuit is formed by the variable capacitance diode VC 1 and coil L 1 + coil L 2 on the antenna tuning side, and the oscillation side is variable. capacitance diode
VC 2 and coil L 3 + coil L 4 form an oscillation circuit. In this case, band select switch SW 1 is
When switching to the side, coil L 2 and coil L 4 are grounded at high frequency. Diode for high speed switching
The ON resistance of D 2 , D 3 , and D 9 is unstable with respect to temperature and bias current, and the band select switch SW 1
When the resistor R, which drops the current flowing when switching the high-speed switching diode D5 to the ground when the switch switches to the b side, is small (less than several 100 kΩ), the oscillation circuit is Q-dumped, causing the oscillation width to become unstable and oscillation to stop. If this becomes large, there is a drawback that it becomes difficult to switch diode D5 stably due to temperature changes and small variations in components. Experimentally, R is 200-300kΩ for diode D5
This is the limit at which the switch can be operated. However, regarding oscillation stability, even at 1MΩ, the amplitude decreased and oscillation stopped. Furthermore, the diodes D 2 and D 3 have drawbacks that cause tracking and sensitivity instability.
本考案は上記欠点を取除く為に考案されたもの
で、図面に示す実施例について説明すれば、第２
図に示すごとく、アンテナ同調回路をMWバンド
用コイルL1とLWバンド用コイルL2を接続して構
成し、発振回路をMWバンド用コイルL3とLWバ
ンド用コイルL4を接続してなるAM受信機におい
て、バンドセレクトスイツチSW1がMW側（図示
ａ）に切換つた時にリレースイツチSW2がON
し、コイルL1とコイルL2との２次側接続部がア
ース接続すると共に、コイルL3とコイルL4との
２次側接続部がアース接続し、バンドセレクトス
イツチSW1がLW側（図示ｂ）に切換つた時にリ
レースイツチSW2がOFFし、前記コイルL1とコ
イルL2、コイルL3とコイルL4の両２次側接続部
のアース接続が開放されるAM受信機のMW／
LW2バンド切換回路である。 The present invention was devised to eliminate the above-mentioned drawbacks, and if the embodiment shown in the drawings is explained, the second embodiment will be described.
As shown in the figure, the antenna tuning circuit is configured by connecting the MW band coil L 1 and the LW band coil L 2 , and the oscillation circuit is configured by connecting the MW band coil L 3 and the LW band coil L 4 . In the AM receiver, when band select switch SW 1 is switched to the MW side (a in the figure), relay switch SW 2 is turned ON.
The secondary side connection between coil L 1 and coil L 2 is connected to ground, the secondary side connection between coil L 3 and coil L 4 is connected to ground, and band select switch SW 1 is connected to LW side ( When the switch is switched to b) shown in the figure, the relay switch SW 2 is turned OFF, and the ground connections of both the secondary side connections of the coil L 1 and the coil L 2 , and the coil L 3 and the coil L 4 are opened. /
This is an LW2 band switching circuit.
本考案回路は上記のような構成になつているの
で、バンドセレクトスイツチSW1がａ側に切換つ
た時にリレースイツチSW2がONし、コイルL2の
両端がアース接続し、アンテナ同調回路は可変容
量ダイオードVC1とコイルL1で同調回路が形成さ
れ、発振回路側もコイルL4の両端がアース接続
し、発振回路はコイルL3、パデイングコンデン
サPC1、可変容量ダイオードVC3で発振回路が形
成され、MIX回路へはダイオードD2を通つて導
入される。バンドセレクトスイツチSW1がｂ側に
切換つた時に、リレースイツチSW2がOFFし、
高速スイツチング用ダイオードD1がONしてコイ
ルL1可変容量ダイオードVC1の同調回路はダンプ
して無効となり、アンテナ同調側はコイルL2と
可変容量ダイオードVC2で同調回路が形成され、
発振側は可変容量ダイオードVC3とコイルL3＋コ
イルL4で発振回路を形成する。 The circuit of the present invention has the above configuration, so when band select switch SW 1 is switched to side a, relay switch SW 2 is turned on, both ends of coil L 2 are connected to ground, and the antenna tuning circuit is variable. A tuned circuit is formed by capacitance diode VC 1 and coil L 1 , and both ends of coil L 4 are connected to ground on the oscillation circuit side, and the oscillation circuit is made up of coil L 3 , padding capacitor PC 1 , and variable capacitance diode VC 3. is formed and introduced into the MIX circuit through diode D2 . When band select switch SW 1 switches to side b, relay switch SW 2 turns OFF,
The high-speed switching diode D 1 turns on, and the tuning circuit of the coil L 1 and variable capacitance diode VC 1 is dumped and becomes invalid. On the antenna tuning side, a tuning circuit is formed by the coil L 2 and the variable capacitance diode VC 2 .
On the oscillation side, an oscillation circuit is formed by variable capacitance diode VC 3 and coil L 3 + coil L 4 .
本考案は以上に述べたごとく、２メークの安価
なリレースイツチSW2を使用することにより、安
定で安価なAM受信機のMW／LW2バンド切換回
路を提供するもので、商品価値を著しく向上し、
実用的価値大なる工業上有益な考案である。 As described above, this invention provides a stable and inexpensive MW/LW 2-band switching circuit for AM receivers by using two makes of inexpensive relay switch SW 2 , which significantly improves the product value. ,
It is an industrially useful invention with great practical value.
第１図は従来のMW／LW2バンド切換回路図、
第２図は本考案MW／LW2バンド切換回路図。
L1，L2はアンテナ同調用コイル、L3，L4は発
振用コイル、SW1はバンドセレクトスイツチ、
SW2はリレースイツチ。
Figure 1 is a conventional MW/LW two-band switching circuit diagram.
Figure 2 is the MW/LW two band switching circuit diagram of the present invention. L 1 and L 2 are antenna tuning coils, L 3 and L 4 are oscillation coils, SW 1 is a band select switch,
SW 2 is a relay switch.
Claims (1)
LWバンド用コイルL2を接続して構成し、発振回
路をMWバンド用コイルL3とLWバンド用コイル
L4を接続してなるAM受信機において、バンドセ
レクトスイツチSW1がMW側に切換つた時にリレ
ースイツチSW2がONし、コイルL1とコイルL2と
の２次側接続部がアース接続すると共に、コイル
L3とコイルL4との２次側接続部がアース接続
し、バンドセレクトスイツチSW1がLW側に切換
つた時にリレースイツチSW2がOFFし、前記コ
イルL1とコイルL2、コイルL3とコイルL4の両２
次側接続部のアース接続が開放されるAM受信機
のMW／LW2バンド切換回路。 The antenna tuning circuit is connected to coil L1 for MW band.
The oscillation circuit is configured by connecting the LW band coil L 2 and the MW band coil L 3 and the LW band coil.
In an AM receiver with L 4 connected, when band select switch SW 1 switches to the MW side, relay switch SW 2 turns ON, and the secondary side connection between coil L 1 and coil L 2 is connected to ground. along with the coil
The secondary side connection between L 3 and coil L 4 is grounded, and when band select switch SW 1 is switched to the LW side, relay switch SW 2 is turned OFF, and coil L 1 , coil L 2 , and coil L 3 are connected to each other. and coil L 4 both 2
AM receiver's MW/LW 2 band switching circuit where the ground connection at the next side connection is opened.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11322381U JPS5819546U (en) | 1981-07-29 | 1981-07-29 | AM receiver MW/LW 2 band switching circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11322381U JPS5819546U (en) | 1981-07-29 | 1981-07-29 | AM receiver MW/LW 2 band switching circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5819546U JPS5819546U (en) | 1983-02-07 |
| JPS6236363Y2 true JPS6236363Y2 (en) | 1987-09-16 |
Family
ID=29907531
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11322381U Granted JPS5819546U (en) | 1981-07-29 | 1981-07-29 | AM receiver MW/LW 2 band switching circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5819546U (en) |
-
1981
- 1981-07-29 JP JP11322381U patent/JPS5819546U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5819546U (en) | 1983-02-07 |
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