I am trying to capture a cosine at 300KHz sent from a vector signal
generator(VSG) using USRP B210. VSG is connected to USRP using SMA
signal level at the input of B210 is -30dBm.
For this, I have made a simple flowgraph in GRC which is attached. Clock
reference is external and is provided from the VSG. Sampling rate is 5M,
center frequency is 100e6.
On observing the received samples, there is a periodic " ramp " on the
received sample. Attaching the plot. I do not observe this effect while
using N210. Also I do not observe this if I use the internal clock.