JPS61371U - UHF band RF modulator - Google Patents
UHF band RF modulatorInfo
- Publication number
- JPS61371U JPS61371U JP8387884U JP8387884U JPS61371U JP S61371 U JPS61371 U JP S61371U JP 8387884 U JP8387884 U JP 8387884U JP 8387884 U JP8387884 U JP 8387884U JP S61371 U JPS61371 U JP S61371U
- Authority
- JP
- Japan
- Prior art keywords
- modulator
- audio
- band
- uhf band
- circuit
- 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
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図はこの考案の背景となる■正帯のＲＦモジュレー
タの一例を示すブロック図である。
第２図はＦＭ回路の出力点における音声副搬送波成分の
スペクトラムを示すグラフである。
第３図はこの考案の一実施例を示す要部回路図である。
第４図は第３図実施例のセラミックフィルタの廟波数特
性を示すグラフである。
第５図はこの考案の他の実施例を示す要部回路図である
。
第６図は第５図に示すセラミックフィルタの周波数特性
の一例を示すグラフである。
図において、１４はＦＭ回路、１６は合成回路、２２は
混合回路、２８．３０はレベル調整用抵抗、３１は合成
点、３２は３端子セラミックフイルタ、３４は２端子セ
ラミックフィルタを示す。FIG. 1 is a block diagram showing an example of a positive band RF modulator, which is the background of this invention. FIG. 2 is a graph showing the spectrum of the audio subcarrier component at the output point of the FM circuit. FIG. 3 is a circuit diagram of a main part showing an embodiment of this invention. FIG. 4 is a graph showing the wave number characteristics of the ceramic filter of the embodiment shown in FIG. FIG. 5 is a main circuit diagram showing another embodiment of this invention. FIG. 6 is a graph showing an example of the frequency characteristics of the ceramic filter shown in FIG. In the figure, 14 is an FM circuit, 16 is a synthesis circuit, 22 is a mixing circuit, 28.30 is a level adjustment resistor, 31 is a synthesis point, 32 is a 3-terminal ceramic filter, and 34 is a 2-terminal ceramic filter.
Claims (1)
波数変調回路、前記周波数変調回路からの音声周波数変
調信号と映像信号とを合成するための合成回路および前
記合成回路からの合成信号とＬＪＨＦ帯の搬送波とを混
合するための混合回路を備えるＵＨＦ帯のＲＦモジュレ
ータにおいて、 前記音声周波数変調信号と前記映像信号との合成点およ
び前記混合回路の入力の間に、前記音声副搬送波の少な
くとも２倍の高周波を除去するためのセラミックフィル
タを設けたことを特徴とするＵＨＦ帯のＲＦモジュレー
タ。 ２ 前記セラミックフィルタは前記音声副搬送波の基本
波を通過するバンドパスフィルタを含む、実用新案登録
請求の範囲第１項記載のＬＪＨＦ帯のＲＦモジュレータ
。 ３ 前記セラミックフィルタは、前記２倍の高調波をト
ラツプするためのセラミックトラップを含む、実用新案
登録請求の範囲第１項記載のＵＨＦ帯のＲＦモジュレー
タ。[Claims for Utility Model Registration] 1. A frequency modulation circuit for frequency modulating an audio subcarrier with an audio signal, a synthesis circuit for synthesizing the audio frequency modulated signal from the frequency modulation circuit and a video signal, and the synthesis circuit. In the UHF band RF modulator, the UHF band RF modulator includes a mixing circuit for mixing a synthesized signal from the LJHF band with a carrier wave of the LJHF band, between the synthesis point of the audio frequency modulated signal and the video signal and the input of the mixing circuit. 1. A UHF band RF modulator, characterized in that it is provided with a ceramic filter for removing high frequencies at least twice as high as audio subcarriers. 2. The LJHF band RF modulator according to claim 1, wherein the ceramic filter includes a bandpass filter that passes the fundamental wave of the audio subcarrier. 3. The UHF band RF modulator according to claim 1, wherein the ceramic filter includes a ceramic trap for trapping the double harmonic.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8387884U JPS61371U (en) | 1984-06-06 | 1984-06-06 | UHF band RF modulator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8387884U JPS61371U (en) | 1984-06-06 | 1984-06-06 | UHF band RF modulator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61371U true JPS61371U (en) | 1986-01-06 |
Family
ID=30632901
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8387884U Pending JPS61371U (en) | 1984-06-06 | 1984-06-06 | UHF band RF modulator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61371U (en) |
-
1984
- 1984-06-06 JP JP8387884U patent/JPS61371U/en active Pending
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