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Date: Thu, 26 Jan 2006 14:04:59 +0100
From: Hartmut Wolff <wolff@bbs2-gifhorn.de>
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Roelof,

 > Looking at my overnight SpecLab captures, there appeared to be a
 > substantial difference in background noise. It was much stronger from
 > 02:00 - 05:00 and from 06:00 - 06:30 UTC. Have other listeners 
  > observed
 > this also?
 > At the time a massive thunderstorm was lurking over the Mediterranean.
 > Could this have caused the increase in band noise?

I'm using several K9AY loops here with a main -3 db lobe of about 145 
degrees. Mainly in use for T/A on 137kHz is the antenna pointing at 
310°, because  with other antennas pointing more southerly the noise 
level is much higher, especially when there are T-storms over the 
Mediterranean.
So I believe your higher noise level is caused by the T-storms.

73

Hartmut