Gnuradio Time Plot/constellation using USRPs showing nothing using PN correlator

[engineer7861]

I'm doing channel sounding implementation using Sliding Correlator technique in GNUradio. Where I'm sending repeated PN sequence using GLFSR source and at receiver USRP using PN Correlator module, correlating in order to find the Channel impulse response. this method is given in this paper(https://zenodo.org/records/1096697). First I did it on my Windows PC without USRPs using a Channel Model, everything was fine. Today's I tried it using USRPs, but seeing nothing on Time Plot at USRP Source. But on the other hand Frequency Plots are showing clear spectrum. Could someone Please help me why there is no graph on Time PLots?. thanks

[engineer7861]

Edited:

I have checked the Time Sink settings, and now it's working. My questions are as follows:

I'm using two antennas for both transmission (TX) and reception (RX) with the same USRP, which are separated by a distance of 7 meters. I'm generating the same sequence using a GLFSR, which I'm using for PN correlator. I'm interested in plotting a clear channel impulse response that shows the multipath delay. However, what I'm currently seeing in my Time Sink plot is not suitable for analysis, as it doesn't provide a clear visualization of the delay impulses caused by multipath fading.