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Re: Modulator
What is your motive for using a modulator, rather than just running audio and video cables?
As far as High Definition, the coding for placing this signal into a television channel is very complex, and I'm not aware of any consumer device which can generate a ATSC signal — not to mention that taking component outputs from a decoder box and re-encoding it would add a layer of MPEG corruption. If your decoder box has a FireWire output, that transmits the compressed digital signal as it is, which might be of some use to you.
In theory, it would be possible to use an RF carrier signal for MUSE or TCI high-definition transmission formats, which carry both picture and sound in an analog form ; but there is no equipment in the US which can even recognise these Japanese standards, much less process them.
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