Re: [Madwifi-users] Power output in Ubiquiti SR5

[Pablo O. <po...@eh...>]

I have measured the power in 3 different OS: Linux (Madwifi), StarOS and
Mikrotik. No one of these show more than 20dBm with SR5.

I am discussing this with Ubiquiti Support right now. I will let you
know if I get something new.

El mi=C3=A9, 09-08-2006 a las 10:50 -0700, Daniel Wu escribi=C3=B3:
> I have made some changes a while back to the way the txpower is
> changed in madwifi-ng.
> =20
> From what I can tell, the hal is the limiting factor and not the other
> parts of the driver (except maybe the=20
> channel power maximum determined from the regdomain, etc)
> =20
> I would like to help resolve this problem, but I don't have a spectrum
> analyzer to measure the power output.
> =20
> Maybe, someone can test the driver from the BSD OS and see if they get
> similar results.
> That way, we can tell which part is at fault.
> =20
> --dyqith
>=20
> =20
> On 8/8/06, Pablo Osuna <po...@eh...> wrote:=20
>         Hi all,
>        =20
>         There have been a lot of discussion on this list about
>         performance of
>         the SR5 Ubiquiti card, especially in terms of power level.
>         Well, I would=20
>         like to share some of the conclusions I have reached about
>         this topic.
>         Basically, and I am not the first to say this, SR5 are not
>         giving 26dBm
>         (400mw) in no way.
>        =20
>         I have setup two nodes (WRAP boards). One is connected to a
>         nice=20
>         spectrum analyzer (Agilent E4407B) and the other one is
>         connected to a
>         small antenna (5 dBi).
>        =20
>         I have used Madwifi 0.9.2 release with pebble software and I
>         got at the
>         maximum 17 dBm in the spectrum analyzer: 9 dB less!!! I have
>         tried to=20
>         change the channel: lower channels (149) perform 1 dB better
>         than higher
>         ones (165), change countrycode, etc etc but I never got
>         something better
>         than that. Default txpower (if you see iwconfig) is 17dBm, you
>         can=20
>         increase that only 1 dB more, to 18dBm. Higher than that is
>         not allowed
>         (you can check that with iwlist ath0 tx). I have also tried
>         with
>         madwifi-old drivers but some behaviour ...
>        =20
>         Also I have tried to use another OS different from Linux. With
>         StarOS I=20
>         got some improvement, 20 dBm, but still 6 dBm less than the
>         theoretical
>         value. Icarus 0S showed some figures as Madwifi, and Mikrotik
>         same
>         story ...
>        =20
>         I have to say I am quite disappointed about these results.
>         This Saturday=20
>         we are doing a 40km PtP link in 5.8GHz. We are using 29dBi
>         antennas but
>         I think it will be a good adventure ...
>        =20
>         We have some other PtP links (also around 40km) in 802.11g,
>         6Mbps, built
>         with SR2 400mW cards. They are performing very well and
>         running for=20
>         several months. We have measured the power of these cards in
>         laboratory
>         and they are giving right numbers (around 25dBm).
>        =20
>         Please, any feedback with SR5 cards or tips will be very good
>         for us :)
>        =20
>         Regards!=20
>        =20
>         Pablo
>        =20
>        =20
>         ---------------------------------------------------------------=
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>=20