[ale] Problem with monitor cord extension

[John Wells]

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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