Subj : Re: Moon bounce
To   : alt.ham-radio.vhf-uhf
From : Hank Oredson
Date : Sat Oct 22 2005 00:22:21

From Newsgroup: alt.ham-radio.vhf-uhf

"Dale Parfitt" <par@parelectronics.com> wrote in message 
news:wC56f.24593$l_2.18191@trnddc02...
>
> "Roger wrote:.
>>>>
>>>> You also run into higher atmospheric absorption.
>>>
>>>Not true, at least at VHF and UHF:
>>>Atmospheric absorption is  a non factor in all weather conditions from 
>>>VHF
>>>into the lower microwave bands.
>>
>> I find clouds and particularly rain to be real problems.
>> above 440.
> That's very odd considering rain has zero effect on 4.2 GHz satellite TVRO 
> transmissions (  C Band) and 432 is a decade lower in frequency.
> Also zero effect on  432/1296/2304 MHz amateur satellite work.
>
> Guess I'll bite- Given there is no literature to support this  ( IEEE 
> Journal on Propagation, professional texts, amateur publications etc) ) 
> how do you know clouds play a role in your diminished 440 work?
> Dale W4OP


Easy enough to look it up ... Google is your friend.
No, I'm not going to ;-)

However ...
In the case of wet fir trees, there is an added 10 db path
loss between dry and wet seasons over a 60 mile path
that has 1 mile of grazing incidence through a forest.
Pacific NW, packet radio link, 430 MHz, 10 years of observation.
Yes, I know it is wet trees and not water vapor.

-- 

  ... Hank

http://home.earthlink.net/~horedson
http://home.earthlink.net/~w0rli

.