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they pop up on ebay all the time, prices are all over the place but you should be able to get one for around 40$ if you can wait for a good deal. they use DIP switches to set the RF out channel, and just need a audio and composite video in. I think the correct name is a Blonder Tonge agile modulator, I have the 450 there are others. It can be a bit confusing so look for the correct inputs and RF outputs and the little door that hides the DIP switches in the front.
another benefit is you can adjust the audio and video modulation levels, which is good for getting rid of sync buzz on sets that do not deal with that well.
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