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Path: utzoo!utgpu!news-server.csri.toronto.edu!rutgers!mit-eddie!bloom-beacon!snorkelwacker.mit.edu!apple!julius.cs.uiuc.edu!usc!cs.utexas.edu!wuarchive!udel!haven!mimsy!prometheus!media!csense!bote
From: bote@csense.uucp (John Boteler)
Newsgroups: sci.electronics,rec.ham-radio
Subject: Curing Grappler Box RFI
Keywords: RFI grappler macintosh
Message-ID: <1990Nov25.064753.186@csense.uucp>
Date: 25 Nov 90 06:47:53 GMT
Followup-To: poster
Distribution: usa
Organization: Common Sense Computing, McLean, VA.
Lines: 23

Has anyone had any success in reducing the incredibly
high amount of RF radiated from their Grappler box?

My housemate has one hooked to a Mac and the thing makes most
of the frequencies in my scanner and ham equipment useless,
throwing birdies out all over the place.

I tore it apart with the intent of hanging capacitors
everywhere, but they actually bothered to do some
filtering at the factory. I added a 0.047uF across
the output terminals of the 7805 voltage regulator
for good measure, but the source of the interference
is the execution of the on-board Z8's program.

Please email responses since my feed and my news partition
don't feel well. The clock starts ticking now; if
there is no cure, I'm tempted to Grapple the thing
into the ocean!


-- 
John Boteler   bote@csense                {uunet | ka3ovk}!media!csense!bote
SkinnyDipper's Hotline: 703 241 BARE | VOICE only, Touch-Tone(TM) signalling