Jim,
At each location where I have lived, I have had line noise problems. It turns
out that the main culprit has been the insulators on the pole were either dirty
or cracked by lightning or loose hardware. If they are really old, they may
have a ball and socket connection that is *supposed* to conduct electricity
without creating noise. These usually show up in windy conditions. Hardware
can also get rusty which can cause multiple problems. Be sure not to overlook
lightning arrestors and fuses on the pole.
The experience here is that if you can find the pole where the problem is, the
electric company seems to be more corporative. I usually used a 3 lb. hammer
to hit the pole and the noise sometimes acts up or gets better depending on the
problem. Many around here, jerk on the guy line to wiggle the pole, but that
can be a risky adventure because you never know what that could come apart and
there you are holding onto a wire. Ask them to replace any hardware that is
faulty and try not to let them just clean it, that *never* lasts. You might
call and ask to talk to the person that takes care of these problems. They may
have equipment that they can use to pinpoint it. Lately they have been using
microwave frequency receivers with a dish antenna that has a very narrow beam
width to locate the problem. You also have more than one source; this makes
it especially difficult for some noise blankers to work.
Jim - KR9U
-----Original Message-----
From: Topband [mailto:topband-bounces@contesting.com] On Behalf Of Jim Murray
via Topband
Greetings,Last Fall we moved into a new location. This Summer I spent a lot of
time and effort putting up an Inverted L and radial system. Now after tuning,
etc. completed I have what appears to be power line noise, source unknown at
this time. I threw the main in our home and noise still remained. The closer
I get to the power lines or the antenna system the louder it gets. As I jump
in freq., the higher the band the less noise. I have a portable receiver that
is capable of rx on the ham bands. As it sits right now 160 is just about out
of the question. Rig is a ft1000mp mk5 field and the NB does do a good on the
noise but also on the weak signals. This is the first location in 35 years
that I've run into this. I don't have much faith at this point in the power
company finding the source but will call them this week. Any ideas would be
greatly appreciated and also wondering about Noise Phasing with MFJ-1025. I
read w8ji article on it but not sure if it would help
on noise of this magnitude.Regards,jim/k2hn _________________ Topband
Reflector Archives - http://www.contesting.com/_topband
_________________
Topband Reflector Archives - http://www.contesting.com/_topband
|