On 02/23/2017 08:28 PM, Jon Elson wrote: > Hello, > > new user of gnuradio. I'm still running on Ubuntu 12, so I installed a > virtual Ubuntu 14.04 guest with Virtualbox, as I couldn't get gnuradio > to compile on the Ubuntu 12 system. The virtual 14.04 install seems to > run fine. I have a > nooelec NESDR smart, rtl-sdr. > > I also have linrad installed on the Ubuntu 12 host, and it is able to > bring out weak CW on the 6m band. (Don't have an upconverter, yet.) > There seem to be a couple guys on 6m that are sending slow Morse all day > long, and they generally give QUITE clear audio. The CW is just visible > on the waterfall. > > So, I tried to tune them in with both gnuradio and gqrx. Both just get > noise, and I can't see the signal on the waterfall of FFT graph. Now, > one thing is that linrad is running my rtl at 200 KS/sec, and gnuradio > and gqrx seem to "like" over 1 MHz better. If I try to select 200K > Sa/sec in gqrx, it doesn't seem to improve things any. (Changing the > sample rate in gnuradio requires some tweaking of the decimation, so it > isn't one-click away.)
In order to sample at 200 KS/sec with the RTL dongle you need to be able to write to the registers on the RTL dongle to select the sampling rate. > > Can anybody suggest some settings that help pull out the weaker CW > signals with gnuradio? > > linrad works better at weak signals, but the user interface is awful! > Another thing is that linrad uses only very little CPU resources, but > gnuradio loads my i5 CPU completely. Does that have anything to do with > the virtual environment (virtualbox) or is it just the difference in the > software? > > Thanks very much, > > Jon > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
