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Re: trees



Hello Bob  and the BB,

Trees have a great effect upon 2.4 GHz and and even greater effect the
higher in frequency you go.
Don't look for a vast improvement when the leaves come off.

I am giving a paper at the 2002 AMSAT Symposium [The Foliage Factor at 2.4
GHz] on this very issue.  There has been a great deal of research done
lately (there seems to be more for 10 GHz and above), but a renewed interest
because of the wireless networks (802.11 standard) becoming more widespread.

The best answer is to get your receive antenna as high and as far from the
tree(s) (gives you a better angle) as possible.

Regards,
Gould
----- Original Message -----
From: "Bob V Johnson" <w7lrd@juno.com>
To: <amsat-bb@AMSAT.Org>
Sent: Saturday, July 13, 2002 12:53 PM
Subject: [amsat-bb] trees


> Hello
> Just how attenuating are fir trees at 2.4Ghz?  I was trying to work  into
> Europe and could not even hear the MB.  Would a bigger dish help?  I'm
> fairly new on AO-40 and I haven't had more fun since I lit up my first
> vacuume tube!
> 73...Bob...W7LRD
> Seattle
> ----
> Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
> To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org
>

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