Re: [Discuss-gnuradio] About the latest submission of usrp_spectrum_sense.py

2013-07-27 Thread Ahmed Saeed
Hi Mike, Thank you for your reply. So what if I want to sense with the sensing threshold set by the FCC for white spaces at -114 dBm or -107 dBm. How does the value of "power_db" relates to the value I should compare against given the FCC thresholds ? Kind regards, Ahmed Saeed. On Sat, Jul 27,

Re: [Discuss-gnuradio] About the latest submission of usrp_spectrum_sense.py

2013-07-27 Thread Mike Jameson
Hi Ahmed, Dividing the bin power by the sample rate in the calculation for noise_floor_db and power_db (lines 286 and 287 of https://github.com/gnuradio/gnuradio/commit/cc12277f64207ff79a40094268c843e6b3e2d2d3#L0R286) was done so that the power level stays constant if the sample rate is increased.

Re: [Discuss-gnuradio] About the latest submission of usrp_spectrum_sense.py

2013-07-27 Thread Mike Jameson
Hi Ahmed, You will need to use a calibrated rf source to compare your USRP N210 SDR receiver against and adjust the power_db result (without subtracting the noise floor result from it) to match. I assume it will be a simple case of adding or subtracting 'X' db's to the power_db result for each cal

Re: [Discuss-gnuradio] WX GUI Scope frozen and error-msg gr_vmcircbuf_default_factory: Invalid argument

2013-07-27 Thread Kees de Groot
Tom, that was a good first shot: I created ~/.gnuradio/config.conf with the lines: [wxgui] style = nongl I even tried [wxgui] style = nogl not any difference Then I renamed C:\Python27\Lib\site-packages\PyOpenGL-3.1.0a1-py2.7.egg-info to C:\Python27\Lib\site-packages\PyOpenGL-3.1.0a1-py2.7

[Discuss-gnuradio] question about symbol synchronization for BPSK demodulation

2013-07-27 Thread adream
Hi guys, I'm learning BPSK demodulation recently. I have learned how to do the carrier synchronization in the file of digital_costas_loop_cc.c. so my question is which classes do the symbol synchronization in the gnu radio. thank you very much. ___ Di

Re: [Discuss-gnuradio] how to raise the packet error rate in benchmark

2013-07-27 Thread Nathan West
On Sat, Jul 27, 2013 at 12:03 AM, Adeel Anwar wrote: > In ur GR flowgraph, just add a const-multiply block before USRP-Sink and > multiply the Tx signal with it. Set its value between 0-1. > > -Adeel > > > On Fri, Jul 26, 2013 at 5:29 PM, yeran wrote: >> >> Hi Adeel, >> >> I'm using RFX 2400 for