Jim,
I can't remember where it was on their site that I found this acrobat
file but I have posted on my website for now.
I hope they don't mind. I did quote it wrong. It is 10dBm stronger
instead of 10x stronger which is nearly the same.
You have to read to the very bottom to get to the part that I was
referring to. But it is on my site at this url:
http://www.itsinfinite.com/horizontal.pdf
Yes, I agree polarization is not the problem and he does need to get the
access point inside the building somehow.
Thanks,
Rodney Milam
Infinite Technologies Group, Inc.
www.ItsInfinite.com
Original Message
------------------------------
Message: 6
Date: Wed, 14 Apr 2004 22:44:45 -0700
From: Jim Thompson <[EMAIL PROTECTED]>
Subject: Re: [BAWUG] RE: What dBi 120deg. sector can I use legally w/
200mW
To: "Rodney Milam" <[EMAIL PROTECTED]>
Cc: [EMAIL PROTECTED]
Message-ID: <[EMAIL PROTECTED]>
Content-Type: text/plain; charset=US-ASCII; format=flowed
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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