----- Original Message -----
Sent: Friday, December 03, 2004 11:40 PM
Subject: [TowerTalk] Information of Wireless LAN
> Hi Everybody,
> I wanna want some information on the following things:
> 1. Guidelines for choosing Wireless LAN 802.11 Equipment,
Google for it.. There's a huge variety, working in various bands, with
various receiver sensitivities, etc.
Folks like Seattle Wireless have collected a fair amount of information in
one place http://www.seattlewireless.net/index.cgi
ARRL has their High Speed MultiMedia (HSMM) project
Google for "wireless LUG" and that will turn up stuff (LUG == Linux Users
> 2. Is the Refractive Index applicable for light rays same for the RF?
Yes and no. Basically the same, with small differences. Bear in mind,
though, that the wavelength of RF signals is much much longer than that for
light, so there are some different effects. Turbulence and temperature
gradients in atmosphere are of a scale comparable to RF wavelength and much,
much larger than for optical. On a more practical scale, all manner of
dielectrics are used for RF, and occasionally as "quasi optical" components
(notably for microwave lenses). There are also refractive/reflective
effects when RF bounces off the surface of the earth and off the ionosphere.
Look up refractive index and "dielectric constant"
> 3. How does Direct Sequence Spread Spectrum (DSSS) work?
One of the previous links should get you started.
> I have just started getting trained for HAM and wireless networks, so i
would be posting lots of
There may be better places to post your questions, since this list is more
oriented towards "towers" and "HF antennas that mount on towers", etc.
> Friends Please Help ME!!!
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather
Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions
and ask for Sherman, W2FLA.
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