[600MRG] Experiencing a wierd BCB interference recently

[sbjohnston at aol.com]

 Andy - KU4XR wrote:


 >Has anyone ever experienced broadcast interference - A.M. or Shortwave 
>- that was propagated by a powerline ?


 I've run into such problems several times.  Power lines make pretty good antennas to absorb and re-radiate broadcast signals.  If there is a corroded connection someone acting as a non-linear rectifier (diode) then you can get mixing of the 60 Hz with the broadcast signal and the new signal radiates back into the area.



Steve WD8DAS

sbjohnston at aol.com
http://www.wd8das.net/
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-----Original Message-----
From: Andy - KU4XR via 600MRG <600mrg at mailman.qth.net>
To: 600 meter group <600mrg at mailman.qth.net>
Sent: Mon, Apr 9, 2018 1:47 pm
Subject: [600MRG] Experiencing a wierd BCB interference recently

Greetings all:

I have recently started hearing what sound like BCB interference on 630 meters.. In years of listening; I have
never had any issues with this.. A couple weeks ago, a very strong cold front came thru with extreme winds
for this area.. Gust were reported between 35 to 60 mph in the area I live.. Immediately after that storm front,
I started hearing horrible interference on the frequency of 477.500 KHz .. I can only hear it at night - never during
daytime hours.. In USB , I can not understand the voice ( it is talk all the time ), it sounds like a raspy, chirpy
oscillator that pulls frequency under modulation.. If I put the receiver in A.M. mode with 6 KHz BW; I can 
sometimes make out what is being said, such as the recent NCAA Basketball Tournament - I could hear it..
Some nights, the signal is stronger than others, BUT , the signal - Does Not - fade in and out, the strength
is constant, and ranges from S-9 +5 , to S-9 +20 .. There have been a couple of nights that the interference 
was not there, for instance, another front with wind gusts came through, and the interference went away
for a couple of nights, and then came back with a vengance .. I am recovering from a recent hernia surgery,
so, I have not started the gremlin chase yet... it would help if I could hear it during the day to help determine
if it is local, and possibly something to do with " My Antenna " .. 
*** Has anyone ever experienced broadcast interference - A.M. or Shortwave - that was propagated by a
powerline ? Coincidentally, after the storm system passed, and the interference started, I am also plagued
with powerline buzz that I have not had in a very long time .. Powerline buzz I have dealt with through the
years, but, I have never heard this type of ( what sounds like ), broadcast interference that my memory can 
recall.. I have scanned the BC Band from one end to the other when the interference is in there, and have
not found a station that sounds like what I am hearing.. ( the talk does not match ) .. Combining the endless 
QRM from the very close signal to my SW; and this newly occuring interference from where ever it is coming
from; 630 meters is essentially useless for me, as I am unable to hear ..
When I am able to do so, checking my antenna system, and grounds will be step #1, but, still wondering
if powerlines with defective hardware can propagate interference of this type .. 

Thanks for any comments, and 73 to all:

Andy - KU4XR
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