From blog.makezine.com
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In need of a way to transmit a video signal to an aging antennae-input TV set, John rigged up a working RF modulator from salvaged parts (plus 5V supply) -I decided not to build my modulator from first principles. A simple design with a UHF cavity oscillator and simple sound and vision carrier and modulation circuits is not impossible to make using parts from a scrap TV set, but when so many set top devices already have a modulator built...
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