Path: utzoo!attcan!uunet!husc6!m2c!jjmhome!cloud9!dts
From: dts@cloud9.UUCP (Daniel Senie)
Newsgroups: comp.sys.ibm.pc
Subject: Re: Why clone the PS/2?
Summary: RFI/EMI Interference from computers
Message-ID: <475@cloud9.UUCP>
Date: 22 May 88 07:12:08 GMT
References: <8685@eleazar.Dartmouth.EDU> <5823@well.UUCP> <10600@steinmetz.ge.com> <2565@orca.TEK.COM>
Organization: Stratus Computer, Inc., Marlboro, MA
Lines: 28


[discussion of using 49MHz cordless phones and walkmans to measure
interference from computers.]

Here is an interesting thing to try:

Remove the handset from your telephone (i.e. unclip the modular cord
	at the headset end).

Hold your ear to the receiver, and position your head (with the receiver
to the IBM PS/2 color display (and probably others).

Listen to the nice buzzing coming from the handset.

It's really neat that the telephone handset generates noise without
being connected to anything! These monitors seem to pour out interference.

I have a few televideo terminals on my desk next to the PS/2 display, and
I find if I put the terminals within 16 inches of the PS/2 display, the
characters on the terminal start to quiver.

Does IBM (or anyone else) bother to shield monitors?

-- 
Daniel Senie               UUCP: ihnp4!cloud9!dts 
Stratus Computer, Inc.     ARPA: anvil!cloud9!dts@harvard.harvard.edu
55 Fairbanks Blvd.         CSRV: 74176,1347
Marlboro, MA 01752	   TEL.: 617 - 460 - 2686