txpower settings + ALC option
fromkth+hostap at fastmail.fm
Fri Feb 11 06:51:40 EST 2005
Thanks for the advice and links.
Fortunately my PC-card's(Zyxell B-101) antenna is detachable, so i
detached it from STA's PC-CARD and now i am able to make a handoff
between two APs placed at opposite corners in a room of 15 feet. but I
have not tested it yet when data being transfered between STAs and a
host on DS.
But my original question about info on ALC option(in iwpriv) and if
there is any relation between ALC and txpower option(in iwconfig) still
Also when i do "iwpriv wlan0 getalc" it gives error that Operation not
supported. Does it depend on PC-Cards model/manufacturer or only the
firmware. I have 1.8.0 firmware.
Ged Haywood wrote:
> Hello there,
> On Thu, 10 Feb 2005, Ajeet wrote:
>>>>So what do i need to do to reduce trasmitt power of APs.
>>>I think you might need to do more than reduce the AP transmit power,
>>>since you would not be reducing the AP receiver sensitivity at the
>>>same time. It might be better to put a simple divider network between
>>>the antenna and the AP.
>>These are not commercial APs but are built using Prism2.5 PC-card in a
> That makes no difference.
>>and i am quite new to this area
> So I gather. :)
>>so i dont understand what you mean by divider network between
>>antenna and the AP....can you explain a little bit more.
> The idea is to throw away some of the transmitted and/or received RF
> power by using (for example) a resistor network connected between the
> radio device and its antenna. Another way would be to put the radio
> device and its antenna into a metal box. You could make a few holes
> in the box to let some of the radio energy leak in and out - I don't
> think the results would be very predictable but I'd be interested to
> hear your experience. :)
> You might find this useful:
>>>You could also try for example simply using a dummy load instead of an
>>>antenna on the APs.
>>Again i dont get your point here about dummy load.
> See for example
> and try Googling, there is a lot of information out there on this kind
> of subject.
> Be aware that what works at 10MHz or 100Mz might not work at 2.4GHz.
> You will need to do some reading on the subjects before you can make
> really useful RF measurements. :)
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