Re: [Discuss-gnuradio] usrp_spectrum_sense vs. usrp_fft

2010-06-03 Thread adib_sairi
adib_sairi wrote: > > > > TMob wrote: >> >> Hi, >> >> I am currently trying to use the USRP to sense the 802.11 channels for >> activity. So far, I am using the usrp_spectrum_sense to do this. Each >> time I get the callback from gr.bin_statistics_f, I calculate the signal >> power in the r

[Discuss-gnuradio] Re: hi all, I want to support fpga to add a timestamp when the usrp send and receive data package

2010-06-03 Thread John Wu
Hi all, I learn from some document that usrp have take a timestamp in nanosecond with the data package. Can anyone tell me more detail about that? Since I have not receive usrp board I can not do the experiment to confirm it. Thanks. On Thu, Jun 3, 2010 at 11:40 AM, John Wu wrote: > Hi all, > I

[Discuss-gnuradio] get RSSI with USRP1 and RFX2400

2010-06-03 Thread Su Jinzhao
hi all, I want to use the read_aux_adc method to get the RSSI,After reading the code, I think the argument 1,0 should be right. But the result is strange. when there is no sender , the value returned is always 12. While there is a sender and the distance between sender and receiver is less than 1m

[Discuss-gnuradio] benchmark_tx of gnuradio-3.2.2

2010-06-03 Thread jf w
Hi all, At first, I use the benchmark_tx to send with usrp-a. After sending is finished ,I use the benchmark_rx to receive on the same usrp and there are another sender which is usrp-b.But I can't receive anything. The usrp_source_c gives nothing. If I reload the firmware of usrp-a, everything is

[Discuss-gnuradio] Gnuradio 3.2.2 for RHEL 6

2010-06-03 Thread Brett L. Trotter
I know there aren't too many folks toying with RHEL 6 yet, but I've uploaded gnuradio 3.2.2 RPMS (i386 + x86_64) for RHEL 6 on the new repo. For info: http://blackopsoft.com/RHEL_6 ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.

Re: [Discuss-gnuradio] Phase Lag in USRP Output Signal

2010-06-03 Thread Matt Ettus
On 06/03/2010 11:19 AM, Balijepalli, Arvind wrote: The LFRX has a 50 ohm termination on its input, so when you connect it to a signal generator with a 50 ohm output impedance, the voltage goes down by half vs. open circuit. This is the appropriate behavior. Yes, I would expect that as well. H

Re: [Discuss-gnuradio] usrp_spectrum_sense vs. usrp_fft

2010-06-03 Thread adib_sairi
TMob wrote: > > Hi, > > I am currently trying to use the USRP to sense the 802.11 channels for > activity. So far, I am using the usrp_spectrum_sense to do this. Each time > I get the callback from gr.bin_statistics_f, I calculate the signal power > in the returned data vector using the follow

[Discuss-gnuradio] alpha =0.001 in gr.probe_avg_mag_sqrd_cf

2010-06-03 Thread Juan Quiroz
Hi all I had a problem with tunnel.py, but changing threshold from 30dB to 50dB it was solved, now I'm reading receive_path.py in carrier sensing blocks are defined alpha=0.001 and thres=30 for use with gr.probe_avg_mag_sqrd_cf, please can somebody tell me what is alpha value and why is set to

[Discuss-gnuradio] TV channels power

2010-06-03 Thread Rahman Doost
Hi everyone, I know this is a little out of context, but has anyone done any power measurement on US TV bands either with USRP1 or USRP2? The thing is I was trying to compare my own measurements with TV fool data but I couldn't find any relevance among them. For instance, those channels which are

Re: [Discuss-gnuradio] Phase Lag in USRP Output Signal

2010-06-03 Thread Balijepalli, Arvind
On Jun 3, 2010, at 1:54 PM, Matt Ettus wrote: > On 06/03/2010 10:36 AM, Balijepalli, Arvind wrote: >> >> Matt, Thanks for your reply. The problem seems to be mostly solved >> now, I'll explain below, but to first respond to your >> suggestions/questions. I changed the DAC to accept non-interleave

Re: [Discuss-gnuradio] Phase Lag in USRP Output Signal

2010-06-03 Thread Matt Ettus
On 06/03/2010 10:36 AM, Balijepalli, Arvind wrote: Matt, Thanks for your reply. The problem seems to be mostly solved now, I'll explain below, but to first respond to your suggestions/questions. I changed the DAC to accept non-interleaved data, which I presume should be at 64 MS/s. I setup the i

Re: [Discuss-gnuradio] Phase Lag in USRP Output Signal

2010-06-03 Thread Balijepalli, Arvind
On Jun 3, 2010, at 12:33 PM, Matt Ettus wrote: > On 06/03/2010 05:06 AM, Balijepalli, Arvind wrote: >> Hi all, I plan to use the USRP to run a feedback controller. The >> basic idea is to read in a feedback signal over three input channels >> (two LFRX daughter boards), process them to generate co

Re: [Discuss-gnuradio] gcellized FFTW has broken gcell block

2010-06-03 Thread Eric Blossom
On Thu, May 27, 2010 at 10:16:51AM +0200, matty wrote: > OK, i'm sorry for that! > > (2) The Cell processor is dead, dead, dead. > > Does it mean, no further development in gnuradio code for the Cell > processor? No further development. You can't buy a new PS3 that will run Linux. Sony pulled t

Re: [Discuss-gnuradio] Phase Lag in USRP Output Signal

2010-06-03 Thread Matt Ettus
On 06/03/2010 05:06 AM, Balijepalli, Arvind wrote: Hi all, I plan to use the USRP to run a feedback controller. The basic idea is to read in a feedback signal over three input channels (two LFRX daughter boards), process them to generate control signals that are output over three DACs (using two

Re: [Discuss-gnuradio] 2 issues with latest GIT master, at least on OSX 10.5.8

2010-06-03 Thread Michael Dickens
I just checked -- it's a MacPorts / SDL issue; I'll submit a bug report to them. Sorry! - MLD On Jun 3, 2010, at 9:37 AM, Johnathan Corgan wrote: On Thu, Jun 3, 2010 at 08:16, Michael Dickens wrote: Thanks, Johnathan, for those fixes in recent check-ins; between them and starting with a

Re: [Discuss-gnuradio] 2 issues with latest GIT master, at least on OSX 10.5.8

2010-06-03 Thread Johnathan Corgan
On Thu, Jun 3, 2010 at 08:16, Michael Dickens wrote: > Thanks, Johnathan, for those fixes in recent check-ins; between them and > starting with a clean build, almost everything is taken care of ... one last > item now: > objc[56471]: Class SDLTranslatorResponder is implemented in both > /opt/loc

Re: [Discuss-gnuradio] 2 issues with latest GIT master, at least on OSX 10.5.8

2010-06-03 Thread Michael Dickens
Thanks, Johnathan, for those fixes in recent check-ins; between them and starting with a clean build, almost everything is taken care of ... one last item now: $ make check [snip] Making check in gr-video-sdl Making check in src make check-am make check-TESTS objc[56471]: Class SDLTranslato

[Discuss-gnuradio] Phase Lag in USRP Output Signal

2010-06-03 Thread Balijepalli, Arvind
Hi all, I plan to use the USRP to run a feedback controller. The basic idea is to read in a feedback signal over three input channels (two LFRX daughter boards), process them to generate control signals that are output over three DACs (using two LFTX daughter boards). All of the processing will

[Discuss-gnuradio] OpenGL.error in USRP2

2010-06-03 Thread Krishna S
Hi, I am getting the following error after installing GNU radio package for usrp2 in my machine. OpenGL.error.Error: Attempt to retrieve context when no valid context I am having Quad Core Q9650 3.0GHz, with Nvidia Quadro NVS 295 graphics card installed in Ubuntu 9.04 (32bit) THANKS MA

[Discuss-gnuradio] GNU radio Build for Ubuntu 9.04 server (64bit) with GUI

2010-06-03 Thread Krishna S
Hi, I am trying to install GNU radio packages for USRP2 in Ubuntu 9.04 server (64bit), the basic 9.04 server edition does not come with GUI, but we can enable it buy downloading certain packages. Now i have Ubuntu 9.04 server edition (64 bit) with GUI interface. Can i follow the same proc

Re: [Discuss-gnuradio] need a small application!

2010-06-03 Thread Jim V
Hi Raveh, I advise you to check first the tutorial: http://gnuradio.org/redmine/wiki/gnuradio/TutorialsWritePythonApplications Then there are plenty of examples in gnuradio/gnuradio-examples. raveh_plus wrote: > > hello, > > I'm a beginner in GNU Radio, and I need to a small application t