[600MRG] Experiencing a wierd BCB interference recently

[Alan Cooper]

From: Alan Cooper [mailto:w7aln at netzero.com] 
Sent: Monday, April 09, 2018 1:25 PM
To: 'Dwight Blevins'; '600MGR at mailman.qth.net'
Subject: RE: [600MRG] Experiencing a wierd BCB interference recently

 

Hello Andy,

Is this the current rx antenna setup you are using?

Receiving Antenna at KU4XR 

This is a 160 meter OCF Windom antenna. I use this for reception on MF / LF frequencies


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 <http://ku4xr.webs.com/apps/photos/photo?photoid=145485293> This is a 160 meter OCF Windom antenna. I use this for reception on MF / LF frequencies

 

Just searching for clues…

 

Thanks

 

Alan   W7ALN

 

From: 600mrg-bounces at mailman.qth.net [mailto:600mrg-bounces at mailman.qth.net] On Behalf Of Dwight Blevins via 600MRG
Sent: Monday, April 09, 2018 1:10 PM
To: Andy - KU4XR via 600MRG; 600MGR at mailman.qth.net
Subject: Re: [600MRG] Experiencing a wierd BCB interference recently

 

Dear Andy,

 

Yes I have had instances with broadcast interference on 630m. I think you probably had something go wrong with a connection on the antenna, which is causing an impedance mismatch, or perhaps you have a grounding issue. 

 

I've always found that when my antenna matching is good, with no ground faults, all the bad stuff goes away. When everything is right, I find 630m amazingly clean, no signals heard except other hams. Without exception, every time I've experience something similar to what you are describing, it has always turned out to be a connection problem. 

 

Hope this helps......Ike, KW7T

 

On Monday, April 9, 2018, 12:47:31 PM MDT, Andy - KU4XR via 600MRG <600mrg at mailman.qth.net> wrote: 

 

 

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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