On Fri, Aug 07, 2009 at 10:33:37PM -0500, Ed Spoon - Computer Sales & Services, 
Inc. wrote:
> So, what causes this crazy loss on all of my 'longer' 5.8 links after
> dark/overnight? Temp drop? Contraction? Condensation? Moonbeams?
> 
> More importantly, is there anything I can do about it? Anyone else dealing
> with it?
> 
> Links are N-S, E-W and NE-SW, different brands radios, but all in the ISM
> 5.8 spectrum. Can start as early as 8pm but usually after midnight. Goes
> until the suns been up 1 to 3 hours. Doesn't happen every day, but seems to
> be predominant in the summer when we get over 90 degrees with 90% humidity
> and then the afternoon/evening rain from the buildup. I see it happening to
> short links also, just doesn't get bad enough to "drop".

I was wondering about condensation from the evening dew in the LMR
connectors which might evaporate out after a couple of hours of
sunlight.  Have you checked the connectors/feed horns?

-- 
Scott Lambert                    KC5MLE                       Unix SysAdmin
lamb...@lambertfam.org



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