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[Ham-80211] WAP54 bridge trouble

Darryl Smith Darryl at radio-active.net.au
Wed Jun 6 02:57:42 UTC 2007


If you look at the Wireless Design text books for Cellphone Networks - such
as the ones by C.Y.Lee you will find attenuation curves for Pine Forests.
The reason in this case is that the 850/900 MHz of many cellphones has a
quarter wave wavelength that is about equal to the average length of pine
needles. That is, the pine needles in a pine forest becomes an amazing set
of distributed dummy loads. 

I would imagine that leaves of most trees are much shorter providing more
absorption, and more reflections away too.

Darryl 

-----Original Message-----
From: ham-80211-bounces at lists.tapr.org
[mailto:ham-80211-bounces at lists.tapr.org] On Behalf Of Joe S. Borovetz
Sent: Wednesday, 6 June 2007 12:30 PM
To: TAPR Mailing List for Ham Radio Use of 802.11
Subject: Re: [Ham-80211] WAP54 bridge trouble

The trees are the major problem. I have seen it happen time and again 
on 2.4 wireless LAN links......not using 802.11 but the same applies for
wi-fi.

I have a friend who did links for a major oil company and they 
confirmed time and again that trees and 2.4 do not mix. The same goes for
5.8.

Motorola Canopy which is usually reliable died in the presence of trees.

Joe



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