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RF Audio/ Video Modulator

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I suppose this modulator is intended to be used with a TV. In this case, all you have to do is to add the sound subcarrier signal (or more exactly, the sound intercarrier signal) to the video signal at the input of your video modulator. The sound subcarrier depends on your country: in Europe mainland it is 5.5MHz, in the US, it is 4.5MHz, etc. You can generate this signal using a small VCO modulated with the audio signal. Premphasis is needed and also depends on the TV standard.

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