JPS58182536U - CATV tuner local injection circuit - Google Patents
CATV tuner local injection circuitInfo
- Publication number
- JPS58182536U JPS58182536U JP7734682U JP7734682U JPS58182536U JP S58182536 U JPS58182536 U JP S58182536U JP 7734682 U JP7734682 U JP 7734682U JP 7734682 U JP7734682 U JP 7734682U JP S58182536 U JPS58182536 U JP S58182536U
- Authority
- JP
- Japan
- Prior art keywords
- stage
- tuner
- local
- injection circuit
- catv
- 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.)
- Pending
Links
Landscapes
- Superheterodyne Receivers (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
第１図は本考案の前提となるＣＡＴＶチューナのブロッ
ク図、及び第２図は本考案の実施例を示 。
すローカル注入部分の要部回路図である。
１・・・・・・ＵＨＦバンドチューナ部、２・曲・ハイ
パーバンドチューナ部、３・」・・・・ＶＨＦバンドチ
ューナ部、１１． １２． １３・・・・・・局部発振
段、２０゜３０．４０・・・・・・同調回路、２３．
３３． ４３・・聞発振用トランジスタ、３４．４４・
・・・・・結合コンデンサ。FIG. 1 is a block diagram of a CATV tuner that is the premise of the present invention, and FIG. 2 shows an embodiment of the present invention. FIG. 2 is a circuit diagram of a main part of a local injection part. 1...UHF band tuner section, 2. Song/hyper band tuner section, 3.....VHF band tuner section, 11. 12. 13... Local oscillation stage, 20°30.40... Tuning circuit, 23.
33. 43...Transistor for oscillation, 34.44.
...Coupling capacitor.
Claims (1)
を有するハイパーバンドチューナ部とバンド切替できる
ＶＨＦバンドチューナ部とを備えたＣＡＴＶチューナに
おいて、前記ＶＨＦバンドチューナ部の混合段と局部発
振段間の結合はその同調回路に直結した結合コンデンサ
を用い、前記ハイ共−バシトチューナ部の混合段と局部
発振段間の結合はその発振能動素子に直結した結合コン
デンサを用いて構成され、ハイパーバンド受信時の高域
側ローカル信号の注入低下を阻止するようにしたことを
特徴とするＣＡＴＶチューナのローカル注入回路。In a CATV tuner equipped with a hyperband tuner section having an RF input amplification stage, a mixing stage, and a local oscillation stage, and a VHF band tuner section capable of band switching, the channel between the mixing stage and the local oscillation stage of the VHF band tuner section is Coupling is performed using a coupling capacitor directly connected to the tuning circuit, and coupling between the mixing stage and local oscillation stage of the high co-basic tuner section is constructed using a coupling capacitor directly connected to the oscillation active element. A local injection circuit for a CATV tuner, characterized in that the local injection circuit for a CATV tuner is configured to prevent injection degradation of a high-frequency side local signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7734682U JPS58182536U (en) | 1982-05-26 | 1982-05-26 | CATV tuner local injection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7734682U JPS58182536U (en) | 1982-05-26 | 1982-05-26 | CATV tuner local injection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS58182536U true JPS58182536U (en) | 1983-12-05 |
Family
ID=30086613
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7734682U Pending JPS58182536U (en) | 1982-05-26 | 1982-05-26 | CATV tuner local injection circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58182536U (en) |
-
1982
- 1982-05-26 JP JP7734682U patent/JPS58182536U/en active Pending
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