I did some measurements yesterday with 100mW AP and 13dB antenna. I could not
punch through the brick far enough. So I will be doing the APs inside. Now I
just need to figure out the right AP and antenna combination. From one of the
replies I saw I could have cost savings if I did 90degree antennas and placed
APs every second floor in the middle pointing opposite directions.
| | | |
| |________________________________________| |
| }AP1 AP2{ 160' hallway |
| |----------------------------------------| |
| | | |
| | | |
My other buildings is a bit more complicated, so we might need to place 3APs
every 2nd floor.
Apollo
P.S you can look at our property again at
http://carmelme.com/fileadmin/pics/temp/satimage.jpg
We don't need to cover the parking lot, that is located in the bottom left
corner of property.
> 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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