Hello Ali, The bandwidth parameter will select the Analog RF filters where possible. For the X310 the daughterboards do not have configurable filters so you will have to add a lowpass filter to your flowgraph.
Regards, Derek On Thu, May 17, 2018 at 2:10 PM, Ali via USRP-users < usrp-us...@lists.ettus.com> wrote: > Hi, > > I don't want my sampling rate to be 25 kHz. My sampling rate is already > 195312 Hz which is I think the minimum sampling rate for X310. > > What I want is to filter out the frequencies which are at least 25 kHz > away from my center frequency. For example I don't want to see a > transmission which is 50 kHz away from my center frequency. Is it possible? > How does the "bandwidth" parameter in UHD Source Block in GNURadio affect > the captured IQ data? > > Regards, > Ali > > 2018-05-14 12:19 GMT+03:00 Derek Kozel <derek.ko...@ettus.com>: > >> Hello Ali, >> >> To extend what Marcus has said, here is a link to the UHD manual page >> about sample rates. >> http://files.ettus.com/manual/page_general.html#general_sampleratenotes >> >> Regards, >> Derek >> >> On Mon, May 14, 2018 at 8:54 AM, Müller, Marcus (CEL) <muel...@kit.edu> >> wrote: >> >>> Hi Ali, >>> >>> just like the console will tell you, 25 kS/s is simply impossible with >>> an X310; instead, the minimum possible rate was used. >>> >>> You should probably just configure your X310 to get you e.g. 500 kS/s, >>> and then resample in digital domain. If you're hesitant to design your >>> own decimating filter, use the "rational resampler" block and configure >>> it to decimate by (500/25)=20. >>> >>> Best regards, >>> Marcus >>> >>> On Mon, 2018-05-14 at 10:18 +0300, Ali wrote: >>> > Hi to all, >>> > >>> > I am using GNURadio to control an X310. I want to get IQ samples for >>> only 25 kHz bandwidth. >>> > >>> > When I wrote 25 kHz to the bandwidth line in UHD-Source block in >>> GNURadio, I still see the signals at 50 kHz or 75 kHz away from the center. >>> My sampling rate is 195312 Hz. When checked in MATLAB, the signals are >>> there. It looks like I cannot control the bandwidth with GNURadio. >>> > >>> > I suspected that there is not any DDC filter for this bandwidth. If it >>> is so, what is the minimum bandwidth for USRPs? Are the bandwidths that I >>> can use discrete? I am confused. >>> > >>> > Thanks in advance, >>> > Ali >>> > >>> > _______________________________________________ >>> > 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 >>> >>> >> > > _______________________________________________ > USRP-users mailing list > usrp-us...@lists.ettus.com > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com > >
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