[TowerTalk] computer rfi

[Steve Weisbrod]

Good job Scott. These are the kind of success stories that make this   
reflector worth sorting through the junk every day. I take back my advice   
about trashing it. Keep up the good work. I just love RFI TVI successes.

73 Steve W8GAZ

 ----------
From:  Scott Bullock
Sent:  Monday, July 14, 1997 10:24 PM
To:  steve; 'towertalk@contesting.com'
Subject:  [TowerTalk] computer rfi

Hi esteeemed towertalkians, This is a follow-up to a previous posting
today..... Well, I got itchy tonite after picking up some emi/rfi paint
($19.00 per can), I took my monitor apart-it was already coated with some
emi paint-even measured the resistance-right up to spec-7 ohms per inch,   
I
recoated it completely anyways, as the can I got said multiple coats were
more effective.

For anyone that is contemplating doing this, make sure you take it   
OUTSIDE
before you paint it!  This stuff has Methyl Ethyl Ketone in it-serious
stuff-also good buzz for those of you that like to sniff the stuff-IT'S
STRONG !

At the same time, I took the monitor video extension cable off, I found   
that
the interference would come and go when it was unplugged from the pc,   
even
if the monitor wasn't connected! I cut the extension in two pieces, slid   
on
a full length of rg-8 shield and two MAMBO beads, resoldered it together,
heatshrinked, etc, and plugged it all back in-grounded the new shield to   
the
pc case, and also connected other end of the extension with short solid   
wire
to the metal monitor video connector. Voila!!!!!!!!!!!!!!! No more
interference!

One of the worst frequencies for receiving the crap was believe it or not
14.195.0   It is now completely quiet!  Also powered up the SB200 and ran
full key down on each antenna-no herringbone/squigglies at all! Maybe   
this
monitor won't go kablooie like the last one did from rf!

For those of you that have this problem, give this a shot, it only took   
me
about 1.5 hours even playing with different grounds before I hacked up   
the
cable to install the shield. Definitely worth the time, maybe now I will   
be
able to hear the next DXpedition better on that frequency.

Also fyi, the monitor is 1.5 feet above the ts-930, and the cable runs   
down
through the bench directly behind the amplifier output, and the computer   
is
below the radio by abt 1 foot. I would think this is a worst case   
scenario
for any monitor/computer!

73 to all, hope this was a help to those that needed it, email me direct   
if
you have any questions.

Scott
KA1CLX

P.S. the smell of the emi paint is enough to scare the birds and the   
moles
away for good!  :)


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