[Voyage-linux] Output power troubles

Thu Nov 10 01:22:46 HKT 2005

I have been researching this some as well. I never found anything that
says the power won't stay where you put it. So I am interested in this as
well.

Also for information purposes the pigtail was what was causing my original
problem it is a 200mw card for sure and the while the pigtail was being
installed the pin was bent and partially broken causing poor performace.

So this bring up and interesting question. If you don't know what numbers
do what with the power of the card how can you be sure of the output power
you are using? I would like my systems to stay as legal as possible so I
don't want a bunch of overpowered devices spewing RF all over place. So is
expermentation with the exact card you are planning on using the only way?
That is dumb I wish there was a better way.

> Hi Steve:
>
> I did know the story with readmif and writemif, bud did not know
> anything about settings do not stay forever, and neither the issue with
> setting the card up at something less than the maximum for getting best
> performance. Have you tried both things in a real environment?
>
> When you said "they say" ... Who are "they"? Where did you get these
> tips from?
>
> I would appreciate your answer on this. Thanks!
>
> Pablo
>
> El miÃ©, 02-11-2005 a las 11:22 -0700, Steve Wagor escribiÃ³:
>> Regarding NL2511MP Prism based radios on Voyage and my two cents.
>>
>> iwpriv wlan0 alc 0
>> iwpriv wlan0 writemif 62 128
>>
>> iwpriv wlan0 readmif 62 (CR31)
>> iwpriv wlan0 readmif 116 (CR58)
>>
>> # Setpower script for HostAP devices
>> iwpriv wlan0 alc 0 > /dev/null 2>&1
>> iwpriv wlan0 writemif 62 %VALUE% > /dev/null 2>&1
>> =====================================================> /sbin/iwconfig
>> wlan0 txpower xxxx
>> Does NOT work for setting values for txpower. You can only issue off
>> or auto.
>>
>> Seems you can lowlevel poke and peek values into the card for txpower
>> on
>> Prism still. The main problem is, they say the settings don't stay
>> forever.
>> Everyone suggests putting in a cron every 5 minutes to reissue the
>> commands.
>>
>> If you want to see what is in the register 62 spot then you do:
>> /sbin/iwpriv wlan0 readmif 62
>>
>> If you want to change that value you have to do:
>> /sbin/iwpriv wlan0 alc 0
>> /sbin/iwpriv wlan0 writemif 62 128
>>
>> # Setpower script for HostAP devices, save as /root/Setpower
>> /sbin/iwpriv wlan0 alc 0 > /dev/null 2>&1
>> /sbin/iwpriv wlan0 writemif 62 128 > /dev/null 2>&1
>>
>> Create a file called /root/crontab and put this in there:
>> */5 * * * * /root/Setpower
>>
>> Then do:
>> crontab /root/crontab
>>
>> Now you may want to put that into some autostart file as well.
>>
>> The value of 128 put into register 62 is on some weird scale where 128
>> is
>> the highest number and 127 is the lowest and the numbers 0 or 255
>> means 50%.
>> Nobody can tell you what value to put into register 62 for a specific
>> card
>> to get a specific txpower out of it. The reason for this is a 200mW
>> card
>> will output something different than a 50mW card does when at 100% or
>> even
>> 50%.
>>
>> You might try
>> /sbin/iwpriv wlan0 writemif 62 190
>> instead of 128 as 190 is evidently lowering the output a bit.
>>
>> They do usually suggest output to be slightly less than max though for
>> the
>> card so that it is not over doing it. They liken it to a stereo that
>> is
>> turned up to it's max and how it has distortion.
>>
>> Steve...
>>
>>
>>
>> On 11/2/05, Jerry <mrcool at terraworld.net> wrote:
>>         Hello!
>>
>>         That is very interesting, as I have noticed myself that the
>>         2511mp s that I
>>         have seem to be weak when you compare them to the CB3 or the
>>         2511 pcmcia
>>         card that is in the CB3...
>>
>>         Thanks for the info.  Probably what I have with my luck,
>>         (100mw) but I dont
>>         have a way to test them.  :(  oh well
>>
>>         Thanks all
>>
>>         Jerryf
>>
>>
>>         > Also, there are versions of the MP2511MP that are 100mw.  We
>>         ended up
>>         > with a few in a batch of 50 that we purchased.  no outside
>>         difference,
>>         > so they were only discovered after testing.
>>         >
>>         > KH
>>         > NomadISP
>>         >
>>         > On Wed, 2005-11-02 at 08:00, Andrew Niemantsverdriet wrote:
>>         > > Hi,
>>         > >
>>         > > It seems that my 200mw Senao NL-2511MP Plus (mini-pci)
>>         card is not
>>         putting
>>         > > out near the power it should. Since I am in the US I would
>>         expect the
>>         full
>>         > > 200mw but this is my first Access Point with Voyage, I
>>         have been using
>>         is
>>         > > as a CPE and / or repeater before so I did not pay much
>>         attention to
>>         > > output strength. Anyway is there a setting some where that
>>         needs to be
>>         > > changed to get the full output or is something else
>>         wrong?
>>         > >
>>         > > One more thing what is up with the 2 antenna connectors,
>>         are they
>>         identical?
>>         > >
>>         > > Thanks for any guidance.
>>         >
>>         >
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>>         >
>>
>>
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