USRP X410 Underflows and Overflows

Hello together,

 

i wrote a code for a linear chirp and added the code to the python generated by grc, because GNU Radio has no building block for a linear chirp  except using Signal source and VCO Block.

 

I tried to simulate the linear chirp signal on USRP X410 and send  the chirp signa to USRP X410 l and check the output with the spectrum analyzer. Unfortunately, the simulation causes underflows and overflows for  the sample rate starting at 1 MHz and i cannot receive a proper linear chirp at UHD Source. Moreover, the CPU Usage during the python simulation is below 10%..  When i stop the simulation and want to restart the simulation, RFoncError occurs: Attempting to reconnect input port.

 

I tried to resize the buffer using sudo nano /etc/sysctl.d/99-custom.conf and added net.core.rmem_max=250000000 and applied the changes using sudo sysctl -p /etc/sysctl.d/99-custom.conf.  The the buffer size is resized, but the overflows and underflows are yet occuring and the cpu usage is below 10%.

 

I am sending you the screenshots of my simulation console and hope that you help me!

 

Thank you in advance!

 

Best regards,

 

Olivia Mammadova