Optical links
Infra-red optical video link
An alternative to using microwave signals is to use infrared light signals instead. In principle, this works like your TV remote control, but at very much higher power. An infrared link can be an effective alternative over distances up to 1000 m, and also offers freedom from any regulatory requirement, unlike microwave links used for broadcasting, no licence or permission is required for optical (infrared or laser) links.
The link has a transmitter and a receiver, as with a microwave link, and the units are both tripod mounted allowing transmission of video and audio up to 1 km with direct line of sight. Often, the transmitter and the receiver have built-in telescope sights and signal strength meters ...
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