JPS6349823U - - Google Patents
Info
- Publication number
- JPS6349823U JPS6349823U JP14295786U JP14295786U JPS6349823U JP S6349823 U JPS6349823 U JP S6349823U JP 14295786 U JP14295786 U JP 14295786U JP 14295786 U JP14295786 U JP 14295786U JP S6349823 U JPS6349823 U JP S6349823U
- Authority
- JP
- Japan
- Prior art keywords
- inductance element
- circuit
- channel
- tuned
- double
- 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
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 239000003990 capacitor Substances 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 3
Landscapes
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
Description
第１図は本考案に係るＶＨＦチユーナの段間複
同調回路の一実施例を示す回路図、第２図は第１
図に示す複同調回路の等価回路図、第３図は従来
のＶＨＦチユーナの段間複同調回路の一具体例を
示す回路図である。
ＬＬ１，ＬＬ２……ロウチヤンネル同調用イン
ダクタンス素子、ＬＨ１，ＬＨ２……ハイチヤン
ネル同調用インダクタンス素子、ＶＤ１，ＶＤ２
……可変容量ダイオード、Ｓ……スイツチング素
子、Ｃ７……結合容量。
FIG. 1 is a circuit diagram showing an embodiment of the interstage double tuning circuit of a VHF tuner according to the present invention, and FIG.
FIG. 3 is an equivalent circuit diagram of the double-tuned circuit shown in the figure. FIG. 3 is a circuit diagram showing a specific example of the inter-stage double-tuned circuit of a conventional VHF tuner. LL 1 , LL 2 ... Inductance element for low channel tuning, LH 1 , LH 2 ... Inductance element for high channel tuning, VD 1 , VD 2
... Variable capacitance diode, S ... Switching element, C 7 ... Coupling capacitance.
Claims (1)
素子とハイチヤンネル同調用インダクタンス素子
とを直列接続すると共に上記インダクタンス素子
に可変容量ダイオードを並列接続して同調回路を
形成し、該同調回路を２個設けて複同調回路を形
成すると共に上記各同調回路のロウチヤンネル同
調用インダクタンス素子とハイチヤンネル同調用
インダクタンス素子の各接続点をスイツチング素
子で接続し、該スイツチング素子の開閉にてＶＨ
Ｆのロウ又はハイチヤンネルに切り替えるように
した複同調回路において、上記ロウチヤンネル同
調用インダクタンス素子とハイチヤンネル同調用
インダクタンス素子の上記各接続点にスイツチン
グ素子に並列に小容量の結合容量を接続して上記
２個の同調回路を結合し、ＶＨＦロウチヤンネル
受信時のみ上記結合容量にてＵＨＦ又はＶＨＦの
ハイチヤンネルのトラツプ回路を形成したことを
特徴とする複同調回路。 A VHF low channel tuning inductance element and a high channel tuning inductance element are connected in series, and a variable capacitance diode is connected in parallel to the inductance element to form a tuned circuit, and two of the tuned circuits are provided to form a double tuned circuit. At the same time, each connection point between the low channel tuning inductance element and the high channel tuning inductance element of each tuning circuit is connected by a switching element, and VH is established by opening and closing the switching element.
In a double tuning circuit configured to switch between a low channel or a high channel of F, a small coupling capacitor is connected in parallel to the switching element at each connection point of the low channel tuning inductance element and the high channel tuning inductance element. A double-tuned circuit characterized in that the above-mentioned two tuned circuits are combined to form a UHF or VHF high-channel trap circuit using the coupling capacitance only when receiving a VHF low channel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14295786U JPH0354435Y2 (en) | 1986-09-18 | 1986-09-18 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14295786U JPH0354435Y2 (en) | 1986-09-18 | 1986-09-18 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6349823U true JPS6349823U (en) | 1988-04-04 |
| JPH0354435Y2 JPH0354435Y2 (en) | 1991-12-02 |
Family
ID=31052187
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14295786U Expired JPH0354435Y2 (en) | 1986-09-18 | 1986-09-18 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0354435Y2 (en) |
-
1986
- 1986-09-18 JP JP14295786U patent/JPH0354435Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0354435Y2 (en) | 1991-12-02 |
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