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From: ddl@husc6.UUCP
Newsgroups: comp.sys.amiga,sci.electronics
Subject: Re: FCC req for electronic kits
Message-ID: <3257@husc6.UUCP>
Date: Thu, 19-Nov-87 21:14:21 EST
Article-I.D.: husc6.3257
Posted: Thu Nov 19 21:14:21 1987
Date-Received: Sat, 21-Nov-87 17:07:28 EST
References: <1080@raybed2.UUCP> <2035@umd5.umd.edu> <19164@amdcad.AMD.COM>
Organization: Harvard University Computer Services
Lines: 21
Xref: utgpu comp.sys.amiga:10441 sci.electronics:1543

In article <19164@amdcad.AMD.COM>, rpw3@amdcad.AMD.COM (rpw3) writes:
> Now to begin with, the radiation limits for Class B computing devices are
> a factor of 10 more stringent than for Class A, since Class B devices must
> not interfere with a next-door neighbor's radio or TV in an old, high-density
> apartment complex. (No, you CANNOT tell the neighbor to get cable TV!)

	Does anyone have a few more details on this?  I own many computers
from various manufacturers.  Most are certified Class B; ALL of them cause
(what I would describe as) severe interference with television and radio
in all rooms in my ranch-style house.  I'm sure that distances between
some pairs of rooms are comparable to distances between "high-density"
apartments and by "severe" interference I mean video noise sufficient to
cause modern color televisions to lose sync from time to time.  This
is really anoying because I would like to leave at least one machine
running all the time but I don't want to pay for cable TV either.
Yes, I have tried various combinations of line filters but the problem
seems quite general and consistent.  Maybe one of those tempest-certified
micro-VAXen they were showing at DEC world...

					Dan Lanciani
					ddl@harvard.*