[ale] Problem with monitor cord extension

[cfowler]

Wrap cable in foil?


On Thu, 2003-02-27 at 10:26, John Wells wrote:
> James,
> 
> Thanks for the info. After spending 5 hours last night moving machines,
> running cables, etc., I'd rather not go through moving again.  Do you
> think a more expensive cable would be immune to effects of the UPS?
> 
> Thanks for your help on this, MacGyver...er...James ;-)
> 
> John
> 
> James P. Kinney III said:
> > $40 for a 25' vga cable puts it in the low end category. If the
> > monitor frequency is low enough, it won't show the wavy line and
> > jiggly stuff of noise in the cable.  What the high end cables do is
> > bundle the internal wires like a bunch of tiny coax cables for the RGB
> > lines. This is similar to the Sun and SGI monitor cables, but without
> > the mini RCA jack connectors.
> >
> > Interference can come from a UPS as it has a large transformer that
> > make a big magnetic field at 60Hz. Also, high frequencies tend to
> > "leak" (they're not bounded by the wire, they have frequency/space
> > domains that are larger than the physical copper which is why they are
> > often run in coax).  You might be able to clean up the signal by
> > repositioning the cable. A poor mans coax can be made by wrapping the
> > entire length of cable with extra-heavy duty foil and tightly sealing
> > the long seam down the length of the cable and grounding the foil
> > covering to the PC chassis. It won't stop magnetic interference, but
> > it will stop electric field cross-talk for nearby wires.
> >
> 
> 
> 
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-- 
"The Law of Leaky Abstractions"
There is a time where abstractions lead to the inablity to 
fix problems that leak through the abstraction.
http://www.joelonsoftware.com/articles/LeakyAbstractions.html

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