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Looks like it was built for AM sound. If so, and if you get it restored and working, you could customize an RF modulator to produce AM modulated sound instead of FM. Most RF modulator chips have a separate video modulator and FM sound modulator. You'd need to provide a trap in the video signal to remove energy at 4.5MHz, so it doesn't contaminate the spectrum where the AM sound will be found once the video is modulated onto the RF video carrier. And you'd need to build an AM modulator at the sound carrier frequency.
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01-12-2014, 03:22 PM
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