Bob Myers wrote:

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?


Catel made some FM return channel modulators and demodulators for
CATV systems that fit into a standard 6 MHz channel spacing. They were
pure ****. Murky video, at best, because of the reduced bandwidth.
Metrovision had them in their community loop in Greene Township, Ohio
and were connected to the United Video Cablevision community loop in
Delhi Township, Ohio (Cincinnati, Ohio suburbs) that used standard VSB
equipment. To add insult to injury, the school system insisted that
their control point be in the Metrovision side, and they used an Apple
II computer to generate video to feed the FM modulator. It was
absolutely unreadable on any TV screen after passing through the Catel
junk. I was in charge of the United Video end of that interconnect
project. I built the headend and interconnect point with three RCA
Heterodyne Signal Processors.


--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida