> >>>> 1) When I run my scripts I sometimes get "uOuOuO" message. I read in >>>> the >>>> archives that I need to increase the decimation rate but I have >>>> already >>>> set it to the maximum limit of 256. What should I do? Also, why do I >>>> not >>>> get the message all the time? >>>> > Hi, > > A problem I had a while ago was that my operating system (Ubuntu 8.10) > was throttling my CPU down > to 800MHz. Have a look in /proc/cpuinfo (or similar) to see your current > working clock- speed. > > //Mattias > > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > http://lists.gnu.org/mailman/listinfo/discuss-gnuradio >
the cpuinfo denotes the speed as 993 MHz. I am currently following this formula for calculating the interpolation and decimation rates. r_tx = r_dac / interp / sps r_rx = r_adc / decim / sps Where r_dac is the DAC rate, r_adc is the ADC rate, interp is the interpolation rate, decim is the decimation rate, and sps is the samples per symbol. With the values sps = 8, r_dac = 128e6, r_adc = 64e6 and r_tx = r_rx = 32e3 bps, I get interp = 500, and decim = 250. I use these interp and decim values when initializing the USRP. I was earlier using additional software interpolation using a low pass filter, but I have now removed it. Can someone please tell me why I still get "uOuOuO" message on both Tx and Rx ? I am trying to transmit a file and I believe this is the reason it is not getting received properly. thanks and regards, Sumit _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
