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Re: Wet Trees?


I asked a similar question a while back about AO-40's S-mode downlink. The 
answer I got was that most satellite communications text books state that 
attenuation at 2.4Ghz was about 3db per meter of foliage. Assuming that 
foliage attenuation varies with the square of the frequency, there should be 
much less atennuation at 435mHz than 3db per meter.

I'm sure Dominico ( I8CVS) would have the answer to this one.

73, Tony KT2Q

> On Thu, 27 Jan 2005 08:01:51 -0800, Emily Clarke <w0eec@amsat.org> wrote:
>> In the past few months I've noticed that there are days when I just can't
>> work SO-50 below 12 degrees

>> After testing power out/VSWR and passing the test, the next thing that 
>> came
>> to mind is that the wet trees, mostly thick pines and laurels which still
>> have their leaves, are attenuating the signal more than when they are
>> dry.  Does that seem possible?
>> 73,
>> Emily
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