Tx power conttrol issue

William Tai williamt at arescom.com
Fri Aug 1 17:22:34 EDT 2003

----- Original Message ----- 
From: "Jiri Fojtasek" <jiri.fojtasek at hlohovec.net>
To: <hostap at shmoo.com>
Sent: Friday, August 01, 2003 1:49 PM
Subject: Re: Tx power conttrol issue

> Jirka Bohac wrote:
> >>The txpower code is embraced by a MACRO RAW_TXPOWER_SETTING.
> >>However this macro is not defined yet.
> >>That's what you mean "I believe txpower control is removed from v0.0.4."
> >>
> >>
> >
> >Yes, up to 0.0.3, txpower can be controlled directly with "iwconfig xxx
> >txpower". However, there are a couple of problems. The setting does not
> >remain in effect after a "card reset", which is performed from time to
> >time by the driver. So after the first reset, the power is back on
> >Furthermore, the driver still thinks its on "fixed" and won't let you
> >set it to "fixed" again, until you first turn it to "auto" and then back
> >to "fixed" again.....
> >
> >I tried to address these issues in my patch, located at
> >http://jikos.cz/~jbohac/hostap (tha patch also re-enables txpower
> >control for 0.0.4)
> >
> >
> >Maybe it's because of these problems that Jouni disabled the txpower
> >control support. He also says that the setting is not accurate - indeed,
> >the "decibells" you use in iwconfig have NOTHING TO DO with real output
> >power expressed in dBm. Jouni probably wants to use a special prism
> >power feedback register, CR58, for more accurate setting.
> >
> >However, in our network where most people use the same kind of card, we
> >have our own calibrations, and we learned to live with the old system.
> >The absence of txpower control in 0.0.4 is a big pain for us :(
> >Anything would be better than nothing at all.
> >
> >
> >????
> > Jouni:
> > Is any help needed to get txpower control back in the driver?
> >????
> >
> >regards,
> >
> >
> >Jirka
> >CZFree.Net, Czechia
> >_______________________________________________
> >HostAP mailing list
> >HostAP at shmoo.com
> >http://lists.shmoo.com/mailman/listinfo/hostap
> >
> >
> >
> http://www.intersil.com/data/an/AN1037.pdf
> Here is good explain hows ALC works. Maybe a testing of the CR58, an
> making feedback to the CR31 every TX frame will solve that txpower
> behaviour.
> Jiri
Hi Jiri:

    ALC is off when we try to config txpower. Am I right?
So the ALC you mentioned is another way to control txpower?
I noticed that there are some configuration stored in PDA.
So can I modified the content -PDR 0x0300 and PDR 0x0301 to force txpower



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