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參數(shù)資料
| 型號： | MFJ-8704 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Micro ATV Transmitter |
| 中文描述： | 亞洲電視發(fā)射機(jī)微 |
| 文件頁數(shù)： | 2/4頁 |
| 文件大?。?/td> | 167K |
| 代理商： | MFJ-8704 |
Operation and Setup
Video Input
The block diagram above shows the how the
MFJ-8704
needs to be connected to a video source. Make sure that you have SMPTE
standard video at 1 V P-P. Most consumer and commercial cameras and camcorders deliver SMPTE standard video, at the
“video
out”
connector. If for any reason you are not sure if the video device is delivering SMPTE standard video, you can confirm this by
looking at the video signal on an oscilloscope.
VCC Input
Due to size limitations there is no regulation provided inside the MFJ-8704. It operates on a 9V supply. While the MFJ-8704 may
tolerate about +/- 2V of VCC error, higher supply voltages may reduce the power output. A power supply could be substituted in
place of a battery. Use caution in providing the proper polarity. For battery operation, best results are obtained while using nickel
hydride or lithium 9V batteries. For extended operational time, you can parallel two 9V batteries.
Caution: The MFJ-8704 does not
include reverse polarity protection
. Therefore be careful to not reverse polarity. The red power lead is (+) positive and the black
power lead is (-) negative.
Antenna
The transmitting and receiving antenna are probably the most critical items for attaining best range. A small piece of 1/4 wave wire as
a transmitting antenna in combination with a high gain receiving antenna will work for short-range video transmission.
Best results
are obtained while using both
high gain transmitting and receiving antennas.
Range testing was performed using the following antennas. The transmit antenna was a 14 element yagi, the receiving antenna was an
8 element yagi . At an approximate distant of 3/4 of a mile excellent picture quality was received. The receiver was a consumer grade
Sony TV tuned to Cable CH 59. Please remember, that while a cable ready television would suffice as a good receiver, a sensitive
ATV down-converter will far outperform any cable ready television.
Using a 1/4 wave ground plane (shown below) as a transmitting antenna and using a 14-element yagi antenna for the receiving
antenna, excellent picture quality at 1/2 mile is possible.
Experimental transmit / receive antenna
Some antenna performance characteristics
While some transmit-receive antennas combinations perform differently, the following chart depicts the theoretical system
performance of the MFJ-8704 using various combinations of antennas and an ATV down-converter.
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