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From: John Tully (tullymt.lv)
Date: Wed Apr 11 2001 - 07:41:25 CDT
The 340 has a hardware restriction on going above 30mW. The on-board
amplifier is only capable of ~14dBm. As they say, you can't get blood from
a stone. The settings in the driver were designed for the 4800 which does
have the ability to transmit at 100mW.
At 11:50 AM 4/11/2001 +0200, you wrote:
>I used different power levels a lot during the past. It was working fine
>for me. Depending on the model you have you can choose 4 or five power
>levels. In the first case it goes up to 30mW and in the latter up to
>You have to give the exact values. Otherwise the card takes the next
>closest. Try 1, 5, 20, 50 and 100mW. Values in between are not possible.
>E.g., if you specify something like
>echo "XmitPower: 21" > /proc/aironet/eth0/Config
>the output of
>cat /proc/aironet/eth0/Config should contain a line
>"XmitPower: 50" which means 50mW RF power.
>Tested it 5 minutes ago with the newest PCMCIA package. Can't see any
>vikas kawadia wrote:
> > We are using Cisco aironet 340's and need to change the
> transmit power
> > level of the cards. The doc says it has 4 power levels : 1, 5, 15 and
> > 30mW.
> > I change the power level by modifying the XmitPower field in
> > /proc/aironet/eth1/Config. The changing works perfectly fine for 1 and
> > 30mW. But when I try to change to 5 or 15mW, it changes to 30mW. It gives
> > no error messages but I can change only to either 1mW or 30mW.
> > Either the driver does not support all the 4 power levels or the
> > card's hardware does not support 4 power levels.
> > After this attempt to change the power level to 5 or 15mW, we also
> > tested the range physically and found that the range is same as that at
> > 30mw, thus ruling out the possibility that the power level is actually
> > changing but the proc is not updated.
> > Any clue as to where the problem might be ?
> > Thanks
> > ..vikas
> > _______________________________________________
> > Aironet mailing list - Aironetcsl.cse.ucsc.edu
> > http://csl.cse.ucsc.edu/mailman/listinfo/aironet
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