[mythtv-users] pvr-500 strange lines

[JJ]

Steve Peters - Priority Electronics wrote:

>-----Original Message-----
>From: mythtv-users-bounces at mythtv.org
>[mailto:mythtv-users-bounces at mythtv.org] On Behalf Of JJ
>Sent: Wednesday, November 28, 2007 5:42 AM
>To: Discussion about mythtv
>Subject: Re: [mythtv-users] pvr-500 strange lines
>
>
>(snipp)
>Looks exactly like a ground voltage difference in the two units, can you 
>possibly
>ground the computer case to the unit, that *should* eliminate your shock
>potential between them, and possibly clear up those 60-cycle bars in 
>your video
>    I've had these issues before also, especially on my long 50-foot run of
>s-video cable, hum bars in my video, grounded both systems to each other and
>my video cleaned up! HTH Cheers, John
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>12:29 PM
>
>
>
>Hello, and thanks for the replies. I had no idea is was a bad idea to send
>an attachment. Sorry about that one. How do I go about grounding them? As
>far as I know, the house is grounded already? I've been thinking of getting
>a battery backup incase of power spikes. If I plug both the computer and the
>cable box into that, do you think that would ground them? Could that fix my
>problem?
>-Thanks
>-Steve
>
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>12:29 PM
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>
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>  
>
Attach a wire to the computer case and run it (as short as possible) to 
the case of the other unit....and yes, I *highly* recommend
using a good UPS on both, not just for ground issues, but for possible 
voltage spikes/drops and even power outages...linux is a lot
more forgiving of resets than it used to be (journalled file system), 
but you'd be amazed at how "dirty" the A.C. lines are here in
Nova Scotia...my UPS catches about 20 events daily such as low voltage 
<110, power bumps, and I also get a spike up to
130 volts every morning around 7:00 A.M.....
Cheers,
John
ve1jot