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I don't know if this is actually an RFI problem, but wonder if anyone =
here has run into it or has any thoughts.
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.
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.
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>I don't know if this is actually an RFI problem, but =
wonder if=20
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 reboots=20
when my HVAC system comes on. It's a heat pump system. =
Problem=20
occurs summer and winter. Outdoor compressor kicks on first, =
no=20
problem. Blower comes on half a minute later, PC resets. =
Nothing=20
else in the shack is affected. The shack is about 20 feet away =
from the=20
air handler, and about 45 feet away from the compressor =
outdoors.</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>I've tried a number of things. Replaced fan control =
relay. Put=20
a snap-on ferrite core around the blower wiring. I also changed to an =
electronic=20
(smart) thermostat along the way, but that made no difference in this =
problem=20
(and thankfully didn't introduce any birdies on the RX). Broke =
into the=20
thermostat control wiring and put in ferrite wraps at =
roughly 6 foot=20
intervals. I had already suppressed transmitter =
RFI to/from=20
the PC (I had a reboot problem on 160 TX, and RX birdies =
elsewhere). Added=20
ferrite to the PC reset button wiring. Even disconnected the reset =
button=20
for awhile. There is decent surge protection (commercial unit not a =
$9.95=20
cheapie) on the shack circuit.
<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></BODY></HTML>
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