[Prism54-users] tx power

[Aquila]

Hi,

There is no way that it would actually be transmitting
at 31dBm, no one would pass regulatory ;).

Maybe it's not a good idea to indicate the Tx-Power as
an actual dBm value (unless you can actually measure
that somewhere). Besides, the output power will vary
depending on things such as the hardware and even the
rate at which a frame is sent at. CCK frames are sent
out with a stronger signal, as opposed to OFDM frames.

Maybe it's better to have three settings:
- Low		(0-6 dBm)
- Medium	(7-14 dBm)
- High		(15-30 dBm)

You probably won't get a card that does more than 20
dBm in most domains anyway so 15-30 would make sense.

Stating that this output power setting is only an
initial value and not the actual output level might be
good idea.

It's just an idea, (use it/don't use it) ;) 

I personally think it's misleading to give the actual
value of the OID if the firmware restricts the output
level anyway. Unfortunately I can't think of an OID
which gives the actual TX signal strength. Anyone else
find something like this anywhere in the header
files/sources?

Regards,
Aquila


-----Original Message-----
From: prism54-users-admin@prism54.org
[mailto:prism54-users-admin@prism54.org] On Behalf Of
Jens Maurer
Sent: Tuesday, January 13, 2004 9:07 PM
To: André Ventura Lemos
Cc: prism54-users@prism54.org
Subject: Re: [Prism54-users] tx power




André Ventura Lemos wrote:
> By doing iwconfig I get:
> 
> Bit Rate:54Mb/s   Tx-Power=31 dBm  
Sensitivity=20/200
> 
> but isn't 31 dBm = 1258.93 mW?

Some may want to check the maths, I'm not an
electrical engineer.

> How can that be?

Our driver and the Intersil chipsets are so good, they
will not only do WLAN but also replace your microwave.
 ;-)

The default value appears to be 127 * 0.25 dBm which
is reported as 31 dBm.  It is unknown whether this
stands for "automatic adjustment" or really means 31
dBm.

Jens Maurer

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