"Radium" wrote in message
ups.com...
Smarty, big thanks for your detailed response. One big advantage [that
I could imagine] to using FM -- instead of AM -- to carry the
luminance (Y) signal, is that you can run on your treadmill without
seeing those lines on the screen mask your favorite shows. The
magnetic signals generated by the electronics in the treadmill causes
blinding interference on AM video. FM video is be immune to such
disruptions.

Unless your treadmill is doing something very unusual, the interference
you are seeing is unlikely to be coming in via the RF "front end" of
the TV (where the video demodulation is taking place), and so switching
to FM from AM wouldn't help. (It's more than likely either magnetic
interference upsetting the deflection fields - assuming a CRT-type TV
- or the effects of noise coming in on the AC wiring.)

FM for standard "analog" TV is virtually impossible due to the bandwidth
requirements of typical FM itself. In the case of "digital" TV - well,
for the moment, let's just say that the modulation system used is
considerably different than anything we're talking about here, and
leave it at that, OK?

Bob M.