JPH021976U - - Google Patents
Info
- Publication number
- JPH021976U JPH021976U JP8027888U JP8027888U JPH021976U JP H021976 U JPH021976 U JP H021976U JP 8027888 U JP8027888 U JP 8027888U JP 8027888 U JP8027888 U JP 8027888U JP H021976 U JPH021976 U JP H021976U
- Authority
- JP
- Japan
- Prior art keywords
- lead wires
- circuit board
- printed circuit
- coil
- diodes
- 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
- 239000003990 capacitor Substances 0.000 claims 2
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 claims 2
- 230000010355 oscillation Effects 0.000 claims 2
- 230000010356 wave oscillation Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 7
Landscapes
- Television Signal Processing For Recording (AREA)
- Amplitude Modulation (AREA)
Description
第１図はこの考案の実施例を示す回路図、第２
図は第１図のＲＦモジユレータを実装したプリン
ト基板の斜視図、第３図は第１図のＲＦモジユレ
ータの被変調波出力が最小となる期間に行われる
変調部の平衡調整を説明するための要部の回路図
、第４図は従来のＲＦモジユレータの回路図、第
５図は第４図のＲＦモジユレータを実装したプリ
ント基板の斜視図、第６図は第４図のＲＦモジユ
レータが負変調を行う場合の要部の理想的な動作
波形図、第７図は第４図のＲＦモジユレータが正
変調を行う場合の要部の理想的な動作波形図、第
８図は第４図のＲＦモジユレータが負変調を行う
場合で、変調部のバランス調整を行う前の、被変
調波（ＲＦ信号）出力が最小となる期間ｔ４にお
ける要部の動作波形図である。
Figure 1 is a circuit diagram showing an embodiment of this invention, Figure 2 is a circuit diagram showing an embodiment of this invention.
The figure is a perspective view of a printed circuit board on which the RF modulator of Figure 1 is mounted, and Figure 3 is a diagram for explaining the balance adjustment of the modulation section that is performed during the period when the modulated wave output of the RF modulator of Figure 1 is at its minimum. A circuit diagram of the main parts, Fig. 4 is a circuit diagram of a conventional RF modulator, Fig. 5 is a perspective view of a printed circuit board on which the RF modulator of Fig. 4 is mounted, and Fig. 6 is a negative modulation of the RF modulator of Fig. 4. Fig. 7 is an ideal operating waveform diagram of the main part when the RF modulator shown in Fig. 4 performs positive modulation, and Fig. 8 shows the RF of Fig. 4. FIG. 7 is an operational waveform diagram of the main part during a period t4 when the modulated wave (RF signal) output is at its minimum, when the modulator performs negative modulation and before the balance adjustment of the modulation section is performed.
Claims (1)
ント基板に実装されてシールドケースに収容され
、 上記発振コイルの近傍の上記第１プリント基板
上に形成された帯状のプリントパターンとその両
端より互に平行に導出された第１、第２リード線
とによりピツクアツプコイルが構成され、 上記プリントパターンの中間より第３リード線
が上記第１、第２リード線とほぼ平行に導出され
、これら第１乃至第３リード線は上記シールドケ
ースが実装されている第２プリント基板のそれぞ
れ第１、第２及び第３接続的に接続され、 その第３接続点は第１コンデンサを通じて高周
波的に接地されると共に直流バイアス電圧の供給
を受け、 上記第１及び第２接続点はそれぞれ互に逆方向
の第１及び第２ダイオードの一端が接続され、そ
れらの各他端は共通の第４接続点に接続され、 その第４接続点は搬送波を変調するための映像
信号供給回路に接続されると共に第２コンデンサ
の一端に接続され、その他端よりＲＦ変調出力が
取り出され、 上記第３リード線の中間部を上記第１又は第２
リード線の一方に近付けることにより変調部の平
衡調整を行うようにしたＲＦモジユレータ。[Claims for Utility Model Registration] A carrier wave oscillation circuit having an oscillation coil is mounted on a first printed circuit board and housed in a shield case, and a strip-shaped printed pattern is formed on the first printed circuit board near the oscillation coil. and first and second lead wires led out parallel to each other from both ends of the pick-up coil, and a third lead wire led out from the middle of the printed pattern almost parallel to the first and second lead wires. These first to third lead wires are connected to the first, second, and third connections, respectively, of the second printed circuit board on which the shield case is mounted, and the third connection point is connected to the high frequency through the first capacitor. The first and second connection points are connected to one ends of first and second diodes in opposite directions, and the other ends of the diodes are connected to a common diode. The fourth connection point is connected to a video signal supply circuit for modulating the carrier wave and also connected to one end of the second capacitor, and the RF modulation output is taken out from the other end. Connect the middle part of the lead wire to the first or second
An RF modulator that adjusts the balance of the modulation section by bringing it close to one of the lead wires.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8027888U JPH0453095Y2 (en) | 1988-06-16 | 1988-06-16 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8027888U JPH0453095Y2 (en) | 1988-06-16 | 1988-06-16 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH021976U true JPH021976U (en) | 1990-01-09 |
| JPH0453095Y2 JPH0453095Y2 (en) | 1992-12-14 |
Family
ID=31305110
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8027888U Expired JPH0453095Y2 (en) | 1988-06-16 | 1988-06-16 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0453095Y2 (en) |
-
1988
- 1988-06-16 JP JP8027888U patent/JPH0453095Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0453095Y2 (en) | 1992-12-14 |
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