Hi All, i noticed that there will be used in the most example some special sources. Not the <grc_usrp.simple_source_c> as in my program. Do i have to use for example <usrp.source_c> to adjust the adc_rate ? Which one is the better ? Do i need <grc_usrp.simple_source_c> to visualize it in my Companion ? Regards Markus
on 2009-03-05 14:38
on 2009-03-05 14:44
I can not find the class <grc_usrp.simple_source_c> in the doxygen generated API. Where to find it ?
on 2009-03-05 19:50
To see the usrp simple source in doxygen, you will have to generate doxygen for your gnuradio install (./configure --enable doxygen). The documentation at gnuradio.org will not have it. It may help you to look at http://gnuradio.org/trac/browser/gnuradio/trunk/gr... Simple source exists because actual usrp api is sooo crazy. The goal of the simple source and simple sink is to provide the most useful options to the usrp user. You can change the decimation, but I have never heard of "setting adc rate" for usrp. I think the adc rate is always 64e6 msamps/s... However usrp always has new surprises (somehow???). If changing the converter rate is possible, //somebody// please weigh in here. -Josh
on 2009-03-06 14:00
Josh B. <josh <at> joshknows.com> writes: > Simple source exists because actual usrp api is sooo crazy. The goal of > the simple source and simple sink is to provide the most useful options > to the usrp user. Thank you for your Reply. Is it possible to make an offset so that i get the right dB not dBFS ?
on 2009-03-06 20:46
On Fri, Mar 06, 2009 at 11:59:13AM +0000, feldmaus wrote: > Josh B. <josh <at> joshknows.com> writes: > > Simple source exists because actual usrp api is sooo crazy. The goal of > > the simple source and simple sink is to provide the most useful options > > to the usrp user. > > Thank you for your Reply. > > Is it possible to make an offset so that i get the > right dB not dBFS ? Marcus, To reiterate what other people have said over the past few days, calibrating the USRP requires an understanding of all of the analog and digital controls that are in the path, and then computing calibration coefficients for each possible combination. E.g., changing the gain would change the calibration. Changing the ambient temperature will change the calibration. Changing daughterboard types will change the calibration, changing daughterboards instances will change the calibration. Changing the interpolation or decimation will change the calibration... Spending some time with the USRP FAQ should allow you to understand what's going on. This diagram page, RFX-2400 specific, should help too: http://gnuradio.org/trac/wiki/UsrpRfxDiagrams Eric