Actually G mode works better than that.  We have clients with -80 dB
and they can pull a steady 10 mbps on a X2 cloaked channel (10 MHz of
RF bandwidth).  Even at -85 dB they can still pull 5 mbps and burst to
10 mbps.

Of course these results are with Atheros cards.  I have no idea about
other brands of G mode cards.

Lonnie

On 2/4/07, Marlon K. Schafer <[EMAIL PROTECTED]> wrote:
It's not about antenna size.  It's about signal levels.

Most g radios need -60ish signal levels to work well.  Use the antennas that
you need to make it work right.

Find the sensitivity levels of the product you are using, run the calcs, and
compute a 10 dB or so fade margin.

laters,
marlon

----- Original Message -----
From: "Tom DeReggi" <[EMAIL PROTECTED]>
To: "WISPA General List" <wireless@wispa.org>
Sent: Saturday, February 03, 2007 12:38 PM
Subject: [WISPA] Typical OFDM CPE antennas


>I wanted to get some feedback from the List.
>
> Typically, what Dbi gain antennas are you desiring for OFDM short Near-LOS
> or Mid-range CPE links?
> Is 18 dbi enough?
>
> I'm well aware that 18dbi will not be good for many applications (long
> range or noisy), but what percentage of CPE installtions would it be good
> for?
> Could 75% of the CPE installs be acheived with 18dbi?
>
> I personally, would pick a 21-23db antenna as a preferred choice, but
> PacWireless Rootennas are 19dbi, and often used with 13-15 dbm CM9 cards.
> The beamwidth of 18dbi (< 20-30 degrees) is pretty good for interference
> resilience and OFDM maximized, and if more gain was needed it could be
> accommodated with higher power radios such Teletronic's >18dbm Atheros
> cards or Ubiquiti's SR5 18-26db cards.
>
> Tom DeReggi
> RapidDSL & Wireless, Inc
> IntAirNet- Fixed Wireless Broadband
>
>
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--
Lonnie Nunweiler
Valemount Networks Corporation
http://www.star-os.com/
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