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Technically speaking, what you are looking for is a NTSC encoder, a device which takes the luminance and colour-difference signals and generates a chroma subcarrier, either multiplexed with the luminance [composite] or not [S-Video]. An electronics hobbyist would have little trouble building a crude one, though it would not be exactly to spec. More convenient might be to get a cheap RF modulator which accepts component inputs: it has a NTSC encoder within it, and you could actually tap that -- though to do so would involve breaching the seal which could void you warranty and/or FCC license, and you'd want to kill the actual modulator part to avoid filling your neighbourhood with interference. Possibly the simplest solution would be to run the component video into a modulator, and then hook the modulator to an outboard TV tuner with a composite output [such as is found in many outboard Closed Caption decoders]. I think, actually, Radio Shack markets a transcoding distribution amplifier/switcher with component, S-Video, composite, and RF connectors on all inputs and outputs, although that might be a little much for your application.
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