Re: RE: What dBi 120deg. sector can I use legally w/ 200mW

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
> 


-------------------------------------------------
Visit CARMEL MUSIC & ENTERTAINMENT website http://carmelme.com
_______________________________________________
BAWUG's general wireless chat mailing list
[unsubscribe] http://lists.bawug.org/mailman/listinfo/wireless