Jonathan Hallameyer wrote:
>  Hello all,
> I have a question about composite (CVBS) video and analog broadcast TV in
> NTSC land.  Going from a composite video source to an RF input on a TV
> usualy would be done with a "modulator'  but the real question is,  does the
> 'modulator' actually modulate anything, given that for NTSC you are going to
> have to Amplitude modulate the luma,  frequency modulate the audio, and use
> QAM for the chroma signals
My understanding (this is from PAL land but afaict NTSC is much the 
same) is that composite video already has the luma and chroma 
information merged together. So the final modulator just has to 
amplitude modulate the video and frequency modulate the audio.

Afaict the modulators used in home AV gear are pretty shittilly made 
devices, indeed i've heard reports that the tuners in modern HDTVs often 
have problems receiving them due to their frequency drift.
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