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Re: [Discuss-gnuradio] Capture and plot 802.11 frames

From: Stratos Keranidis
Subject: Re: [Discuss-gnuradio] Capture and plot 802.11 frames
Date: Wed, 5 Oct 2011 19:54:26 +0300

Hi Marcus,

first I want to thank you for your very fast reply.
I am sorry for not reporting details about my system setup.

I am using a USRP1 model and I have one XCVR2450 daughterboard attached.
Two antennas are connected at the pigtails on the daughterboard.
I used the build-gnuradio install script to for installation and so I
downloaded the latest versions from the 'main' branch for both UHD and
GNU Radio.

I just set the gain at the maximum level and I notice that signals can
be received at the level of -35dBm.

Can I use the usrp_oscope.py to capture plots of the transmitted frames.
My main aim is to able to plot the exact duration of a transmitted
frame, ack packets etc.

I hope the information I provided can help you.

Thank you,

On Wed, Oct 5, 2011 at 7:33 PM, Marcus D. Leech <address@hidden> wrote:
> On 05/10/2011 12:30 PM, Stratos Keranidis wrote:
>> Hello,
>> I am a new user of the GNU platform.
>> I managed to install the paltform on my Ubuntu 10.4 PC
>> and I am currently trying to capture 802.11 frames that are transmitted in my
>> WLAN.
>> I am using these tools:
>> usrp_oscope.py -f 2.412G
>> uhd_fft.py -f 2.412G
>> All I can see is noise on this frequency, although I confirm that packets 
>> are transmitted between my PC and my router on this frequency.
>> Does my problem have to do something with the settings of these tools or do 
>> I miss something else.
>> Can you provide me with some tutorial link, where I can find more info on 
>> the basic usage of USRP?
>> Thank you in advance,
>> Stratos.
> You don't say what your hardware setup is.  Do you have an antenna plugged 
> in?  Is it on the correct port?  Have you tried setting
>  the gain upwards in uhd_fft.py?
> What version of Gnu Radio are you running?  What version of UHD?
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