[mythtv-users] PVR250 and static buildup on cable input?

[Gregory J. McGee]

This is probably going to sound asinine, but cut a 1/8 inch from your
shielding at the connectors of the cable, ONE CUT area ONLY, including
the metal, but not the center insulation. (

At the card is fine, but if it works, consider professional units (a few
bucks) that screw onto your card or such.)

This created what is known as a DC block, or at least a partial one,
preventing ground loops from your cable system ground.

This would be for the video equivalent of audio hum on interconnected
components---One end of the shield gets cut.

I have NO idea if this is your problem, but it could be.

You should be able to google for these as screw in units, professionally
made, but you can hack it to work, probably.

DC blocks also sometimes capacitively couple the center conductor, but
it's usually not required, as it (should be) done in the RF front end of
the card as a standard practice.

If it fails, you're out 69 cents at radio shack for a new connector.

If you pick up noise, try overlapping the shields, but insulate between
them.
(copper foil and a bit of heat shrink, or even aluminum foil and tape to
try it)

If for some unknown reason it is somehow static or a tiny dc signal from
your cable company, a 1 megaohm resistor to ground should  bleed it off,
and should have no effect on signal level.
(keep leads short, entire thing shielded)

I seriously doubt it's the latter scenario.

Good luck!

-- 
Gregory J. McGee <gjmcgee at cableone.net>