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From: rowen@mips.UUCP (Chris Rowen)
Newsgroups: comp.sys.ibm.pc
Subject: AT Serial Cards with Low Emissions
Message-ID: <954@dumbo.UUCP>
Date: Sat, 21-Nov-87 16:28:15 EST
Article-I.D.: dumbo.954
Posted: Sat Nov 21 16:28:15 1987
Date-Received: Mon, 23-Nov-87 05:50:45 EST
Lines: 19
Keywords: UART,Serial,FCC

I am looking for leads and recomendations for AT serial 
cards with low electro-magnetic emissions.  I'm particularly
interested in smart and dumb 4-16 port UART cards which
might be expected to pass FCC Class B is a fairly typical
AT box.  Unfortunately, your average serial card has a 
two-layer board (which picks up all the noise in the box), 
unfiltered, unshielded port connections (which allow the noise 
out of the box) and unshielded telephone-type cables (which 
broadcast the box's electrical noise rather efficiently).
These same features also make the system more vulnerable to
electro-static discharge.

I am not an EMI expert, but I suspect there must be considerable
variation in the emissions of different boards and connection
styles.

Thanks,
Chris Rowen			decwrl!mips!rowen or rowen@mips.COM
MIPS Computer Systems		930 Arques Ave. Sunnyvale CA 94086
---> Generic disclaimer: I speak for only for myself, etc. <---