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Re: [RFI] Interesting Noise

To: doug@k4ac.com, rfi@contesting.com
Subject: Re: [RFI] Interesting Noise
From: Jimk8mr@aol.com
Date: Thu, 10 Mar 2011 22:46:51 EST
List-post: <rfi@contesting.com">mailto:rfi@contesting.com>
Tell us more about the noise:  does it have a buzz to it (60/120 Hz),  or 
is it white noise?
If the former, some sort of power line related noise.  Hard to  
troubleshoot if it only shows up once every two years for a few minutes.
If it is white noise, it is likely precipitation static, which is not  
affected or controlled by surge suppressors. DC grounding is likewise not a  
preventative measure, since it is grounding at the RF frequency that would  
It is common for precipitation static to be worst in the first few minutes  
of a storm, even though the precipitation continues on for a while.
How high is the antenna? Generally the higher it is, the more prone to  
precipitation static.  In the case of large stacked HF yagis, it is common  for 
the top one to be affected by precipitation static, while the lower one  
isn't. (This is also a matter of a sort of shielding of the lower antenna by 
the  higher one).
73  -  Jim   K8MR
In a message dated 3/10/2011 10:05:55 P.M. Eastern Standard Time,  
doug@k4ac.com writes:

I've  received several emails indicating rain/precipitation static. I don't
think  so as:

1) the antenna it was connected to is at DC ground (halo  loop)

2) there is a surge suppressor in the outside connect  panel

3) there's another surge suppressor at the input to the  radio

4) I've been in Florida for a lot of years and this is the first  time I've
ever heard anything like this on 2 meters. It sounded very much  like line
noise (which I've spent the better part of a year working with  the local
power company to eliminate).

5) although the rain  continued at a heavy rate for about an hour, the noise
only lasted a few  minutes (never had this happen before  either)


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