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Article #1687

Re: ds3100 gives me a headache

#1687
From: Satish Chittamuru
Date: Fri, 06 Jul 1990 14:28
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In article <6118@helios.ee.lbl.gov> envbvs@epb2.lbl.gov (Brian V. Smith) writes:

   Perhaps you mean fluorescent lights (not neon)?  The reason that many
   (all, in the past) crts use 60Hz refresh rate is to CANCEL the effect of 
   any interference caused by fluorescent lights.  If the refresh rate is
   different than that of the lights, then you get beat frequencies of the
   difference of the two rolling down your monitor.

That is true. If the frequencies are different, then you do get a beat
frequency. But even if the frequencies are the same, but are out of
phase, then too you would get a flicker. By itself it may not be
noticeable, but when you combine it with the fact that a CRT blanks
the screen on a vertical retrace, that could be significant. That
could be reason for the noticeable flicker.

Any comments on that?
--
        -Satish	K. Chittamuru
	chittamu@cs.umass.edu		Software Development Lab.
	chittamu@umass.bitnet		Dept. of Computer & Info. Sciences
					University of Massachusetts
					Amherst, MA 01002
===
God is real, unless cast to an integer.
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Message-ID: <CHITTAMU.90Jul6102850@dino.cs.umass.edu>
Path: arc1-ca.pugleaf.net!utzoo!censor!geac!torsqnt!news-server.csri.toronto.edu!cs.utexas.edu!wuarchive!psuvax1!rutgers!mit-eddie!media-lab!snorkelwacker!bu.edu!xylogics!transfer!crackers!m2c!umvlsi!dime!dime.cs.umass.edu!chittamu
References: <DAVIS.90Jul5122923@pacific.pacific.mps.ohio-state.edu> <LEE.90Jul5152350@quincy.cs.umass.edu> <6118@helios.ee.lbl.gov>

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From: chittamu@dino.cs.umass.edu (Satish Chittamuru)
Newsgroups: comp.sys.dec
Subject: Re: ds3100 gives me a headache
Message-ID: <CHITTAMU.90Jul6102850@dino.cs.umass.edu>
Date: 6 Jul 90 14:28:50 GMT
References: <DAVIS.90Jul5122923@pacific.pacific.mps.ohio-state.edu>
 <LEE.90Jul5152350@quincy.cs.umass.edu> <6118@helios.ee.lbl.gov>
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Organization: University of Massachusetts at Amherst
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In-reply-to: envbvs@epb2.lbl.gov's message of 5 Jul 90 21:55:15 GMT