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May 15th 05, 08:42 PM

In (rec.radio.amateur.homebrew), Michael A. Terrell wrote:
Jeremy Boden wrote:

In message .com,
writes
I'm looking for a solid desktop (either pizza-box or mini-tower)
computer case that has an all-metal exterior for shielding RFI. This
is for use around radios etc. I realize that SVGA monitors, mice, and
keyboard leak too, but right now I'm looking mainly at the PC box.

Most of the cheaper cases come pretty close to good shielding, but they
have these plastic filler panels in the drive bays that offer no
shielding and let a lot of RF leak out.

Most of the fancier cases in the computer stores around here have
humongous plastic pieces on the side. I'm looking for all-metal.

Rack-mount server cases seem to be pretty good in terms of metal
shielding all around but I need something for desktop use.

Any suggestions? If all else fails I can just put some perforated
metal over the holes in a cheap case, but I'd rather just buy a good
case to begin with.

Tim.

What band does a PC broadcast on?

--
Jeremy Boden

It depends on the computer.

What he said. Usually on all harmonics of each clock in the box, from ~1.8
MHz on up to near daylight -- or at least well past 70 cm., in the case
of the boxes here at home and at work. Add in all their cross-modulation
products as well, and it starts to look pretty gross. One of these days
I'll borrow a spectrum analyzer and see what's coming from where. I know
that the bedroom TV puts out a lot of stuff around 3.5-4.0 MHz. and the
cable box is pretty noisy, too. Hard to hear DX over all the in-house QRM.

--
Mike Andrews W5EGO 5WPM
Extra
Tired old sysadmin working on his code speed

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