JPH0188568U - - Google Patents
Info
- Publication number
- JPH0188568U JPH0188568U JP1987184539U JP18453987U JPH0188568U JP H0188568 U JPH0188568 U JP H0188568U JP 1987184539 U JP1987184539 U JP 1987184539U JP 18453987 U JP18453987 U JP 18453987U JP H0188568 U JPH0188568 U JP H0188568U
- Authority
- JP
- Japan
- Prior art keywords
- radio waves
- television
- voltages
- exciter
- exciter series
- 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
- 230000003321 amplification Effects 0.000 claims description 2
- 238000001514 detection method Methods 0.000 claims description 2
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 3
Landscapes
- Details Of Television Systems (AREA)
Description
第１図は本考案のＡＧＣ回路の原理ブロツク図
、第２図は本考案の一実施例のテレビ中継放送機
のブロツク図、第３図は従来のテレビ中継放送機
のブロツク図である。
図において、１，１′は受信高周波部、１―１
はＲＦアンプ、１―２は第１のミキサ、１―３は
第１局部発振器、２，２′は中間周波増幅部（Ｉ
Ｆアンプ）、３，３′は送信高周波部、３―２は
第２のミキサ、３―３は第２局部発振器、４，１
０はスイツチ、５は電力増幅部、６は結合器、７
はフイルタ、８，８′は比較器、９，９′は可変
利得回路、１１は入力フイルタ、１２，１２′は
検波回路、１３は分配器を示している。
FIG. 1 is a block diagram of the principle of an AGC circuit according to the present invention, FIG. 2 is a block diagram of a television relay broadcasting machine according to an embodiment of the present invention, and FIG. 3 is a block diagram of a conventional television relay broadcasting machine. In the figure, 1 and 1' are reception high frequency parts, 1-1
is an RF amplifier, 1-2 is a first mixer, 1-3 is a first local oscillator, 2 and 2' are intermediate frequency amplification units (I
F amplifier), 3, 3' are transmitting high frequency section, 3-2 is second mixer, 3-3 is second local oscillator, 4, 1
0 is a switch, 5 is a power amplifier, 6 is a coupler, 7
is a filter, 8 and 8' are comparators, 9 and 9' are variable gain circuits, 11 is an input filter, 12 and 12' are detection circuits, and 13 is a distributor.
Claims (1)
キサイタ系列を通して周波数の異なるテレビ電波
に変換し、前記複数エキサイタ系列の１系列を電
力増幅部５に接続して送信するテレビ中継放送機
の自動利得制御回路であつて、 前記電力増幅部５の出力電波の一部を取得する
結合器６と、該取得した電波を分配する分配器１
３とを備えるとともに、前記各エキサイタ系列に
前記分配された電波を検波する検波回路１２，１
２′と、前記各検波電圧と設定電圧とを比較して
その差電圧を検出する比較器８，８′と、前記差
電圧によつて各エキサイタ系列の利得を制御する
可変利得回路９，９′とを備えたことを特徴とす
るテレビ中継放送機の自動利得制御回路。[Claims for Utility Model Registration] A television that converts received television radio waves into television radio waves of different frequencies through a plurality of exciter series consisting of active and standby lines, and connects one of the plurality of exciter series to a power amplification unit 5 for transmission. An automatic gain control circuit for a relay broadcasting machine, which includes a combiner 6 that acquires a part of the output radio waves of the power amplifying section 5, and a distributor 1 that distributes the acquired radio waves.
3, and a detection circuit 12,1 for detecting the radio waves distributed to each of the exciter series.
2', comparators 8, 8' that compare the detected voltages with the set voltages and detect the difference voltages, and variable gain circuits 9, 9 that control the gain of each exciter series based on the difference voltages. An automatic gain control circuit for a television relay broadcasting machine, characterized in that it is equipped with the following.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987184539U JPH0617362Y2 (en) | 1987-12-02 | 1987-12-02 | Automatic gain control circuit for TV relay broadcasting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987184539U JPH0617362Y2 (en) | 1987-12-02 | 1987-12-02 | Automatic gain control circuit for TV relay broadcasting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0188568U true JPH0188568U (en) | 1989-06-12 |
| JPH0617362Y2 JPH0617362Y2 (en) | 1994-05-02 |
Family
ID=31475894
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1987184539U Expired - Lifetime JPH0617362Y2 (en) | 1987-12-02 | 1987-12-02 | Automatic gain control circuit for TV relay broadcasting |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0617362Y2 (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57162537A (en) * | 1981-03-31 | 1982-10-06 | Fujitsu Ltd | Heterodyne television relay broadcasting residual side band amplitude modulating type device |
| JPS617148U (en) * | 1984-06-19 | 1986-01-17 | 日本電気株式会社 | Broadcasting transmitter |
-
1987
- 1987-12-02 JP JP1987184539U patent/JPH0617362Y2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57162537A (en) * | 1981-03-31 | 1982-10-06 | Fujitsu Ltd | Heterodyne television relay broadcasting residual side band amplitude modulating type device |
| JPS617148U (en) * | 1984-06-19 | 1986-01-17 | 日本電気株式会社 | Broadcasting transmitter |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0617362Y2 (en) | 1994-05-02 |
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