Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!csd4.milw.wisc.edu!leah!rpi!crdgw1!steinmetz!sungod!davidsen
From: davidsen@sungod.steinmetz (William Davidsen)
Newsgroups: comp.sys.ibm.pc
Subject: Re: 386 PCs and FCC Class A and Class B certification.
Keywords: business use ONLY, RF interference, low cost 386PCs
Message-ID: <13815@steinmetz.ge.com>
Date: 16 May 89 17:10:15 GMT
References: <6930@bunny.GTE.COM>
Sender: news@steinmetz.ge.com
Reply-To: davidsen@crdos1.UUCP (bill davidsen)
Distribution: usa
Organization: General Electric CRD, Schenectady, NY
Lines: 28

In article <6930@bunny.GTE.COM> js07@GTE.COM (Jack Shaio) writes:

| One way of turning a Class A into a Class B is to put conductive paint all
| over the inside of the box; any experience with this ?

  This does wonders on a machine with a plastic case. Of course, I've
never seen a 386 with a plastic case. 

  This was done for a few PC clones which came in plastic or other
non-conducting cases. All it seems to do for a metal case is give you a
chance for a paint peeling to drop somewhere someday. I remember doing
it, copper worked better than aluminum, and adding aluminum foil stuck
on with rubber cement was best.

  As much as this brings back memories of "the old days," if it was
that easy the vendors would do it themselves. I once had a system that
took out every TV in the house, and a hard disk that opened the
neighbor's garage door on power up. EMI is much less these days, and the
cheap solution is gone.

  Careful placement of the system will *usually* allow you to use them
without problems, although if you are in an apartment building you will
want to think before you buy. Most class A machines will *almost* make
class B, except the rack mounted things with no back and sides.

	bill davidsen		(davidsen@crdos1.crd.GE.COM)
  {uunet | philabs}!crdgw1!crdos1!davidsen
"Stupidity, like virtue, is its own reward" -me