http://anarchy.translocal.jp/microtv/howtotvtx.html very simple, I'm fifteen and I can do it, now that's saying something. It's a mod of the simplest fm transmitter and it dosnt come with a receiver because the receiver it the television itself as long as it's not to new of a tv. If you can find a receiver that'd be great and IDE apreciate if you let me know as well because I'm trying to make mods to a camera and a walk talki with this as a kind of video chat thing but I need a receiver for the video. Also I suggest making the simplest Fm transmitter as well because unless you try the hard version you will not get sound just video. Good luck and god speed.
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If all you need is to get the audio/video signal from one room to another (eg, from your VCR in the family room to the TV set in the kitchen), X10 used to make a unit which worked pretty well, priced at about $100, and (I think) also including the ability to send IR signals back the other way so a remote control could also work remotely. Haven't looked recently to see if it, or indeed if X10, still exists.
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If so then either you know why there are no "simple" video transmitters or why you can't build one without prior knowledge and skills.