Hi Marcus. Thanks for your reply. I've tried 2.5e6sps and I had the same result:
[image: n200_2.5e6.png] If I put a tune_request only in the uhd_source block, I obtain this: [image: n200_uhd_source_tune_request.png] And if i put the tune_request only in the uhd_sink block: [image: n200_uhd_sink_tune_request.png] Regards, Fito.- On Fri, 8 Jul 2022 at 06:35, Marcus Müller <marcus.muel...@ettus.com> wrote: > Hi Gonzalo, > > the tune requests work exactly the same. > > I'd point out that 400 kHz is a sampling rate that's simply very very low, > and might not > work well on the N200, where the Master Clock Rate is a fixed 100 MHz, so > the digital > signal from the 100 MHz ADC needs to get divided by 250, which isn't even > divisible by 4. > Try a sampling rate of 2.5 MHz instead, and look whether things look nicer > :) > > Also note that 20 dB gain for the UBX and the B200 mean something very > different! > > Best regards, > > Marcus > > On 07.07.22 22:36, Gonzalo Figueroa wrote: > > Hello everyone! > > > > I'm having problems trying to understand how tune_request works in the > N200 model (ubx > > daughterboard). > > > > I've been working in the past with the B200 and I used to get rid of the > LO using tune > > requests. But doing the same with the N200 leads to a different behavior. > > > > I have a B200 and N200 in the lab. So,to illustrate the problem I've > made this flowgraph: > > flowgraph.png > > Both USRPs are connected in loopback (TX/RX port with RX2 port). > > > > Running this flograph with a B200 gives me this: > > b200.png > > > > And N200 this: > > n200.png > > > > When I run the same flowgraph without tune_request I obtain this: > > *B200* > > b200_no_offset.png > > > > *N200* > > n200_no_offset.png > > > > Could you help me understand how tune_request works? And How to use it > properly with the > > N200? > > > > Regards, > > Fito.- > > > > PS: Attached you will find the output of the command uhd_usrp_probe for > both USRPs. > > > > _______________________________________________ > > USRP-users mailing list -- usrp-users@lists.ettus.com > > To unsubscribe send an email to usrp-users-le...@lists.ettus.com > _______________________________________________ > USRP-users mailing list -- usrp-users@lists.ettus.com > To unsubscribe send an email to usrp-users-le...@lists.ettus.com >
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