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How to Do Long-Range Wireless Video Transmission
This article discusses the factors involved in achieving long-range wireless video transmissions. It shows how to connect two access points (one as a transmitter and one as a receiver) and an HD outdoor video camera.
If you have a need to transmit a video signal over long distances for security purposes, you have a CCTV application, you need a night vision camera, you have a long range surveillance application, other AV requirements that require an IP camera, then this article is for you.
Video transmission is much more sensitive to getting everything right than is audio transmission. To achieve long distance wireless video transmission you will certainly require true line of sight between the transmitting and receiving antennas.
To achieve long-range wireless video transmission, optimally you would place the antennas 15-20 feet above any obstructions as shown in the illustration below.
If you have no obstructions other than the ground then you still want to shoot for getting the antenna as high as possible to achieve maximum distance as shown in the illustration below. Believe it or not, the ground actually counts as an obstacle!
If you are installing your system in the winter, be sure to factor in any trees between the transmitter and receiver. What works perfectly well in the winter may not work at all in the summer when the trees grow their leaves. The moisture-laden leaves are good at blocking signals.
Another factor to consider as interference are items that move. In the illustration below, the video is fine as long as the truck is not in the way. The solution is to raise the antenna so you always have line of sight.
The camera side also has an access point that is set to transmit mode. It too includes a 24 volts DC Power over Ethernet (PoE) injector as its power source. The camera also requires an 802.3af compatible PoE injector that will provide the correct voltage it needs (802.3af auto detects voltage). Since this side is usually outside, a water-proof electrical junction box with a 110VAC outlet is included to house both PoE devices.
A short CAT 5 cable (included) connects the two PoE devices together. Longer CAT 5 cables are available for purchase and you will need one for the camera and one for the access point. You will need to measure the cable length required for optimal positioning of both devices.