Hi Everybody, I am new to GNURadio. I have two usrp1 devices (B210, USRP Ser#1054, tested on: 9/20/06). I am trying to transmit and receive float data using these two devices. I did the followings so far. 1. using matlab wrote a value(.212) to .wav file. Used the following command audiowrite('test.wav’,0.212,8000,'BitsPerSample', 16) 2. Converted test.wav file to dat file using the following command ./wav_to_dat.py -I test.wav -r 32000 -N 1 audio-0.dat 3. I used the B210 device to transmit the data using following command ./fm_tx4.py -a usrp1 -s 400000 -f 500000000 -n 1 (I found fm_tx4.py script in Gnuradio examples directory) 4. I used the other usrp device to receive the data in the same frequency using uhd_nbfm_receive.grc flow graph which I also found in the example directory. I added a wav file sink block in the flow graph beside audio sink. When I read the wav file using matlab audioread function I receive data different than the original data. Can someone please suggest me if I am missing something? Or I am doing it in the wrong way? Or other alternative solutions with sample code/flow graph I can use. Thank you in advance for your time and response. Sincerely Mahbubur

NBFM modulation is intended to convey analog audio data from one point to another, it's *NOT* intended to convey digital data. At the receiver, and NBFM demodulator will faithfully reproduce the high-level "topology" (for lack of a better term) of the modulating signal, but not, the low-level detail. Further, in the absence of a completely noise-free channel, the demodulated signal will be contaminated with some amount of noise. I'd suggest that you learn more about how to send digital *data* over radio links, and the tools and techniques to do that. On 2015-02-26 13:32, Md Mahbubur Rahman via USRP-users wrote: > Hi Everybody, > > I am new to GNURadio. I have two usrp1 devices (B210, USRP Ser#1054, tested on: 9/20/06). I am trying to transmit and receive float data using these two devices. I did the followings so far. > > 1. using matlab wrote a value(.212) to .wav file. Used the following command > audiowrite('test.wav',0.212,8000,'BitsPerSample', 16) > 2. Converted test.wav file to dat file using the following command > ./wav_to_dat.py -I test.wav -r 32000 -N 1 audio-0.dat > 3. I used the B210 device to transmit the data using following command > ./fm_tx4.py -a usrp1 -s 400000 -f 500000000 -n 1 > (I found fm_tx4.py script in Gnuradio examples directory) > 4. I used the other usrp device to receive the data in the same frequency using uhd_nbfm_receive.grc flow graph which I also found in the example directory. I added a wav file sink block in the flow graph beside audio sink. > > When I read the wav file using matlab audioread function I receive data different than the original data. Can someone please suggest me if I am missing something? Or I am doing it in the wrong way? Or other alternative solutions with sample code/flow graph I can use. Thank you in advance for your time and response. > > Sincerely > Mahbubur > > _______________________________________________ > USRP-users mailing list > USRP-users@lists.ettus.com > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com [1] Links: ------ [1] http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com

Hi Mahbubur, I've already tried to answer your question on StackOverflow; if something is unclear, please don't hesitate to follow up :) Best regards, Marcus Müller On 02/26/2015 07:32 PM, Md Mahbubur Rahman via USRP-users wrote: > Hi Everybody, > > I am new to GNURadio. I have two usrp1 devices (B210, USRP Ser#1054, > tested on: 9/20/06). I am trying to transmit and receive float data > using these two devices. I did the followings so far. > > > 1. using matlab wrote a value(.212) to .wav file. Used the following > command > audiowrite('test.wav’,0.212,8000,'BitsPerSample', 16) > 2. Converted test.wav file to dat file using the following command > ./wav_to_dat.py -I test.wav -r 32000 -N 1 audio-0.dat > 3. I used the B210 device to transmit the data using following command > ./fm_tx4.py -a usrp1 -s 400000 -f 500000000 -n 1 > (I found fm_tx4.py script in Gnuradio examples directory) > 4. I used the other usrp device to receive the data in the same > frequency using uhd_nbfm_receive.grc flow graph which I also found in > the example directory. I added a wav file sink block in the flow graph > beside audio sink. > > When I read the wav file using matlab audioread function I receive > data different than the original data. Can someone please suggest me > if I am missing something? Or I am doing it in the wrong way? Or other > alternative solutions with sample code/flow graph I can use. Thank you > in advance for your time and response. > > Sincerely > Mahbubur > > > _______________________________________________ > USRP-users mailing list > USRP-users@lists.ettus.com > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com

On 02/26/2015 11:39 AM, Marcus Müller via USRP-users wrote: > Hi Mahbubur, > I've already tried to answer your question on StackOverflow; if > something is unclear, please don't hesitate to follow up :) > > Best regards, > Marcus Müller Marcus, is there an easy way to find gnuradio questions on stackoverflow? Philip > > On 02/26/2015 07:32 PM, Md Mahbubur Rahman via USRP-users wrote: >> Hi Everybody, >> >> I am new to GNURadio. I have two usrp1 devices (B210, USRP Ser#1054, >> tested on: 9/20/06). I am trying to transmit and receive float data >> using these two devices. I did the followings so far. >> >> >> 1. using matlab wrote a value(.212) to .wav file. Used the following >> command >> audiowrite('test.wav’,0.212,8000,'BitsPerSample', 16) >> 2. Converted test.wav file to dat file using the following command >> ./wav_to_dat.py -I test.wav -r 32000 -N 1 audio-0.dat >> 3. I used the B210 device to transmit the data using following command >> ./fm_tx4.py -a usrp1 -s 400000 -f 500000000 -n 1 >> (I found fm_tx4.py script in Gnuradio examples directory) >> 4. I used the other usrp device to receive the data in the same >> frequency using uhd_nbfm_receive.grc flow graph which I also found in >> the example directory. I added a wav file sink block in the flow graph >> beside audio sink. >> >> When I read the wav file using matlab audioread function I receive >> data different than the original data. Can someone please suggest me >> if I am missing something? Or I am doing it in the wrong way? Or other >> alternative solutions with sample code/flow graph I can use. Thank you >> in advance for your time and response. >> >> Sincerely >> Mahbubur >> >> >> _______________________________________________ >> USRP-users mailing list >> USRP-users@lists.ettus.com >> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com > > > > > _______________________________________________ > USRP-users mailing list > USRP-users@lists.ettus.com > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >

Hi Philip, use the search box with gnuradio is:question The same works for openembedded ;) Cheers, Marcus On 02/26/2015 09:03 PM, Philip Balister wrote: > On 02/26/2015 11:39 AM, Marcus Müller via USRP-users wrote: >> Hi Mahbubur, >> I've already tried to answer your question on StackOverflow; if >> something is unclear, please don't hesitate to follow up :) >> >> Best regards, >> Marcus Müller > Marcus, is there an easy way to find gnuradio questions on stackoverflow? > > Philip > > >> On 02/26/2015 07:32 PM, Md Mahbubur Rahman via USRP-users wrote: >>> Hi Everybody, >>> >>> I am new to GNURadio. I have two usrp1 devices (B210, USRP Ser#1054, >>> tested on: 9/20/06). I am trying to transmit and receive float data >>> using these two devices. I did the followings so far. >>> >>> >>> 1. using matlab wrote a value(.212) to .wav file. Used the following >>> command >>> audiowrite('test.wav’,0.212,8000,'BitsPerSample', 16) >>> 2. Converted test.wav file to dat file using the following command >>> ./wav_to_dat.py -I test.wav -r 32000 -N 1 audio-0.dat >>> 3. I used the B210 device to transmit the data using following command >>> ./fm_tx4.py -a usrp1 -s 400000 -f 500000000 -n 1 >>> (I found fm_tx4.py script in Gnuradio examples directory) >>> 4. I used the other usrp device to receive the data in the same >>> frequency using uhd_nbfm_receive.grc flow graph which I also found in >>> the example directory. I added a wav file sink block in the flow graph >>> beside audio sink. >>> >>> When I read the wav file using matlab audioread function I receive >>> data different than the original data. Can someone please suggest me >>> if I am missing something? Or I am doing it in the wrong way? Or other >>> alternative solutions with sample code/flow graph I can use. Thank you >>> in advance for your time and response. >>> >>> Sincerely >>> Mahbubur >>> >>> >>> _______________________________________________ >>> USRP-users mailing list >>> USRP-users@lists.ettus.com >>> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >> >> >> >> _______________________________________________ >> USRP-users mailing list >> USRP-users@lists.ettus.com >> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >>

Philip and everyone else, http://gnuradio.org/redmine/projects/gnuradio/wiki/MoreCommunity lists resources such as this. Cheers, M On 26.02.2015 21:09, Marcus Müller via USRP-users wrote: > Hi Philip, > > use the search box with > > gnuradio is:question > > The same works for openembedded ;) > > Cheers, > Marcus > > On 02/26/2015 09:03 PM, Philip Balister wrote: >> On 02/26/2015 11:39 AM, Marcus Müller via USRP-users wrote: >>> Hi Mahbubur, >>> I've already tried to answer your question on StackOverflow; if >>> something is unclear, please don't hesitate to follow up :) >>> >>> Best regards, >>> Marcus Müller >> Marcus, is there an easy way to find gnuradio questions on stackoverflow? >> >> Philip >> >> >>> On 02/26/2015 07:32 PM, Md Mahbubur Rahman via USRP-users wrote: >>>> Hi Everybody, >>>> >>>> I am new to GNURadio. I have two usrp1 devices (B210, USRP Ser#1054, >>>> tested on: 9/20/06). I am trying to transmit and receive float data >>>> using these two devices. I did the followings so far. >>>> >>>> >>>> 1. using matlab wrote a value(.212) to .wav file. Used the following >>>> command >>>> audiowrite('test.wav’,0.212,8000,'BitsPerSample', 16) >>>> 2. Converted test.wav file to dat file using the following command >>>> ./wav_to_dat.py -I test.wav -r 32000 -N 1 audio-0.dat >>>> 3. I used the B210 device to transmit the data using following command >>>> ./fm_tx4.py -a usrp1 -s 400000 -f 500000000 -n 1 >>>> (I found fm_tx4.py script in Gnuradio examples directory) >>>> 4. I used the other usrp device to receive the data in the same >>>> frequency using uhd_nbfm_receive.grc flow graph which I also found in >>>> the example directory. I added a wav file sink block in the flow graph >>>> beside audio sink. >>>> >>>> When I read the wav file using matlab audioread function I receive >>>> data different than the original data. Can someone please suggest me >>>> if I am missing something? Or I am doing it in the wrong way? Or other >>>> alternative solutions with sample code/flow graph I can use. Thank you >>>> in advance for your time and response. >>>> >>>> Sincerely >>>> Mahbubur >>>> >>>> >>>> _______________________________________________ >>>> USRP-users mailing list >>>> USRP-users@lists.ettus.com >>>> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >>> >>> >>> >>> _______________________________________________ >>> USRP-users mailing list >>> USRP-users@lists.ettus.com >>> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >>> > > > _______________________________________________ > USRP-users mailing list > USRP-users@lists.ettus.com > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >