Brian, I realized I forgot to mention, I am using the multi_usrp API and not the RFNoC API, so I am actually unable to use the DRAM FIFO. Do you have any suggestions, or should I work on transitioning the signal generator to an RFNoC installation of UHD?
Best Regards, Jerrid From: Brian Padalino <bpadal...@gmail.com> Sent: Friday, May 1, 2020 10:28 AM To: Jerrid Plymale <jerrid.plym...@canyon-us.com> Cc: usrp-users@lists.ettus.com Subject: Re: [USRP-users] Setting up an X310 as a signal generator On Fri, May 1, 2020 at 1:23 PM Jerrid Plymale via USRP-users <usrp-users@lists.ettus.com<mailto:usrp-users@lists.ettus.com>> wrote: Hello All, So I have been trying to set up a USRP X310 as a signal generator for about a week now, and I’m having some issues. Currently I am using gnuradio-companion to develop the functionality. I have three sets of signal sources that are of float type, creating the I and Q values that get passed to a float to complex block. The output of the three float to complex blocks go to an add block, which then outputs to a USRP sink. Currently, the first problem is with underruns, I’m not getting a lot of them however I am getting breaks in the signal when I pass it to a second USRP X310. What would be the best approach to make sure my signal is coming in strong to the second USRP? I am also having issues with increasing the power of the signal when it is received, is this mainly controlled by the gain value on the USRP source in gnuradio? What can I do to get my incoming signal to have more power? You can try placing a DRAM FIFO in your transmit flow graph as the first thing. That should ensure some tens of milliseconds worth of buffering for your signals and allow for some host jitter without underruns. Do you have an external spectrum analyzer or something that can tell you the power output of the first radio? The receivers should be able to be saturated by your transmitter, so there's definitely a gain issue somewhere. Brian
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