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Hi Jason,
I kind of sounds like your wiring is acting as a resonant circuit for
something that is oscillating. Have you tried turning off all your
breakers except the one your radio is on, or better yet, running your
radio with a battery and turn everything off?
73,
Rob
Jason Reber wrote:
> I wonder if anyone has had a similar problem: I am using an Omni D
> with a 252 power supply, and run an MFJ antenna tuner and RG-58 coax
> to a remote switchbox, which then selects 1 of 5 dipole antennas. I
> have the rig grounded to a cold water pipe nearby. I find that on 30
> and 40 Meters, especially in the evenings, I get patches of very loud
> electrical noise, which covers about a 10 KHz portion of the
> frequency. It just comes in, seemingly out of nowhere, lasts for 4 or
> 5 minutes, and then moves up or down the band several KHz. One time
> when the noise came in, destroying my QSO, I inadvertently turned off
> one of the lights in my shack (there are 2 light circuits in the room,
> and one in the hall nearby). The noise suddenly disappeared. I turned
> the light back on, and it came back. I then turned off the other light
> in the shack, and the noise disappeared again. Then I tried turning
> the hall light off (it was on at the time), and the noise came
> back!The strange thing is, turning lights on and off in other parts of
> the house, including those not even on the same breaker, seem to
> affect the noise. The noise doesn't show up on 10, 15, or 80 meters
> near as bad. I also found that the noise will show up on my old
> Hallicrafters S-76 receiver if I tune it to the same freq. as my Omni
> D. Also strange is the fact the turning off and on lights doesn't
> eliminate the noise- it just causes it to move several KHz up or down
> the band.Does anyone have and idea on what could be causing this?
> I really appreciate the knowledge and help often found on this
> reflector.Thanks,Jason KA7UAM
--
Rob Frohne
E. F. Cross School of Engineering
Walla Walla College
web page: http://www.wwc.edu/~frohro
e-mail: frohro@wwc.edu
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Hi Jason,
<p>I kind of sounds like your wiring is acting as a resonant circuit for
something that is oscillating. Have you tried turning off all your
breakers except the one your radio is on, or better yet, running your radio
with a battery and turn everything off?
<p>73,
<p>Rob
<p>Jason Reber wrote:
<blockquote TYPE=CITE> <font color="#000000"><font size=-1>I wonder
if anyone has had a similar problem:</font></font> <font
color="#000000"><font size=-1>I
am using an Omni D with a 252 power supply, and run an MFJ antenna tuner
and RG-58 coax to a remote switchbox, which then selects 1 of 5 dipole
antennas. I have the rig grounded to a cold water pipe nearby. I
find that on 30 and 40 Meters, especially in the evenings, I get patches
of very loud electrical noise, which covers about a 10 KHz portion of the
frequency. It just comes in, seemingly out of nowhere, lasts for 4 or 5
minutes, and then moves up or down the band several KHz. One time
when the noise came in, destroying my QSO, I inadvertently turned off one
of the lights in my shack (there are 2 light circuits in the room, and
one in the hall nearby). The noise suddenly disappeared. I turned the light
back on, and it came back. I then turned off the other light in the shack,
and the noise disappeared again. Then I tried turning the hall light off
(it was on at the time), and the noise came back!</font></font><font size=-1>The
strange thing is, turning lights on and off in other parts of the house,
including those not even on the same breaker, seem to affect the noise.
The noise doesn't show up on 10, 15, or 80 meters near as bad. I also found
that the noise will show up on my old Hallicrafters S-76 receiver if I
tune it to the same freq. as my Omni D. Also strange is the fact the turning
off and on lights doesn't eliminate the noise- it just causes it to move
several KHz up or down the band.</font><font size=-1>Does anyone have and
idea on what could be causing this?</font>
<br><font size=-1>I really appreciate the knowledge and help often found
on this reflector.</font><font size=-1>Thanks,</font><font
size=-1>Jason
KA7UAM</font></blockquote>
<p>--
<br>Rob Frohne
<br>E. F. Cross School of Engineering
<br>Walla Walla College
<br>web page: <A
HREF="http://www.wwc.edu/~frohro";>http://www.wwc.edu/~frohro</A>
<br>e-mail: frohro@wwc.edu
<br>
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