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Hello Paul,
Is the PC on the same circuit as your HVAC devices? It's possible that =
your problem isn't a surge, but more of a brown/black out situation. Try =
connecting to a different circuit or maybe investing in a small =
UPS(Uninterruptable Power Source).
GL DE KR6NA
--joe
----- Original Message -----=20
From: P. M. Elliott=20
To: rfi@contesting.com=20
Sent: Saturday, October 23, 1999 9:09 AM
Subject: [RFI] PC Reboot Problem
I don't know if this is actually an RFI problem, but wonder if anyone =
here has run into it or has any thoughts.
=20
Occasionally, 2 or 3 times a month, my shack computer reboots when my =
HVAC system comes on. It's a heat pump system. Problem occurs summer =
and winter. Outdoor compressor kicks on first, no problem. Blower =
comes on half a minute later, PC resets. Nothing else in the shack is =
affected. The shack is about 20 feet away from the air handler, and =
about 45 feet away from the compressor outdoors.
=20
I've tried a number of things. Replaced fan control relay. Put a =
snap-on ferrite core around the blower wiring. I also changed to an =
electronic (smart) thermostat along the way, but that made no difference =
in this problem (and thankfully didn't introduce any birdies on the RX). =
Broke into the thermostat control wiring and put in ferrite wraps at =
roughly 6 foot intervals. I had already suppressed transmitter RFI =
to/from the PC (I had a reboot problem on 160 TX, and RX birdies =
elsewhere). Added ferrite to the PC reset button wiring. Even =
disconnected the reset button for awhile. There is decent surge =
protection (commercial unit not a $9.95 cheapie) on the shack circuit.=20
It's a bit hard to troubleshoot because I can't replicate the problem =
at will. Any thoughts appreciated.
73,
Paul N3GPU
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<DIV><FONT size=3D2>Hello Paul,</FONT></DIV>
<DIV><FONT size=3D2>Is the PC on the same circuit as your HVAC devices? =
It's=20
possible that your problem isn't a surge, but more of a brown/black out=20
situation. Try connecting to a different circuit or maybe investing in a =
small=20
UPS(Uninterruptable Power Source).</FONT></DIV>
<DIV><FONT size=3D2>GL DE KR6NA</FONT></DIV>
<DIV><FONT size=3D2>--joe</FONT></DIV>
<DIV> </DIV>
<BLOCKQUOTE=20
style=3D"BORDER-LEFT: #000000 2px solid; MARGIN-LEFT: 5px; MARGIN-RIGHT: =
0px; PADDING-LEFT: 5px; PADDING-RIGHT: 0px">
<DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV=20
style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>=20
<A href=3D"mailto:pelliott@flash.net"; title=3Dpelliott@flash.net>P. M. =
Elliott</A>=20
</DIV>
<DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
href=3D"mailto:rfi@contesting.com"=20
title=3Drfi@contesting.com>rfi@contesting.com</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Saturday, October 23, =
1999 9:09=20
AM</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Subject:</B> [RFI] PC Reboot =
Problem</DIV>
<DIV><BR></DIV>
<DIV><FONT size=3D2>I don't know if this is actually an RFI problem, =
but wonder=20
if anyone here has run into it or has any thoughts.</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>Occasionally, 2 or 3 times a month, my shack =
computer=20
reboots when my HVAC system comes on. It's a heat pump =
system. =20
Problem occurs summer and winter. Outdoor compressor kicks =
on=20
first, no problem. Blower comes on half a minute later, PC =
resets. =20
Nothing else in the shack is affected. The shack is about 20 =
feet away=20
from the air handler, and about 45 feet away from the compressor=20
outdoors.</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>I've tried a number of things. Replaced fan =
control relay.=20
Put a snap-on ferrite core around the blower wiring. I also changed to =
an=20
electronic (smart) thermostat along the way, but that made no =
difference in=20
this problem (and thankfully didn't introduce any birdies on the =
RX). =20
Broke into the thermostat control wiring and put in ferrite wraps =
at=20
roughly 6 foot intervals. I had =
already suppressed=20
transmitter RFI to/from the PC (I had a reboot problem on 160 TX, =
and RX=20
birdies elsewhere). Added ferrite to the PC reset button =
wiring. =20
Even disconnected the reset button for awhile. There is decent=20
surge protection (commercial unit not a $9.95 cheapie) on =
the shack=20
circuit.=20
<DIV> </DIV></FONT><FONT size=3D2>It's a bit hard to troubleshoot =
because I=20
can't replicate the problem at will. Any thoughts=20
appreciated.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=3D2>73,</FONT></DIV>
<DIV><FONT size=3D2>Paul N3GPU</FONT></DIV></BLOCKQUOTE></BODY></HTML>
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