On Apr 14, 2004, at 10:27 PM, Rodney Milam wrote:
Apollo,
1. With 200mW = 23dBm you can use a 13dBm antenna to stay within FCC limits with it being point-to-multipoint.
True only if you're considering EIRP. You also need to worry about out of band emissions, which is why the FCC
wants you to test each antenna+radio combination via certification.
2. Studies from Bell Labs a.k.a. Lucent and others have shown that
horizontal polarization in buildings can increase
your range by up to 10 times the range you would get from vertical
polarization. This is due to the fact that walls
are generally thinner than the floors and therefore signals bounce
off of the floors more than the walls. This gives
you a horizontal corridor. With that being said, I am still skeptical
of it covering the whole building.
Care to cite these sources?
10X range in an environment with a path-loss exponent of 3.0 or more would be.. phenomenal.
my answers to the original questions follow:
1. What is the highest dBi 120deg. sector can I use with uamplified 200mW access point without breaking the law?
Any that have been certified, (and none that haven't) of course.
2. I wonder if I would be able to penetrate our stucture, so I could serve the units on the other side of the building without doing any APs on the other side (the light poles there belong to the city). What polarization should I use?
Sadly, polarization isn't your problem.
Your best bet is to get the AP(s) inside the building.
Jim
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