Hello,

OS: Linux Ubuntu 20.04
GRC: 3.8
UHD: 4.0
USRP: X310 with two UBX-160 daughterboards

Attempting to receive and repeat a spectrum with low latency without using
RX/TX streamers with RFNoC in GnuRadio.
Currently using the default x310 image core.
Steps I have taken to do this:
Shown that I can receive correct signal with a RX-Radio RFNoC Block ->DDC
RFNoC->Rx Streamer.
Also shown that I can transmit correct signal via TX Streamer-.>DUC
RFNoC->TX-Radio RFNoC Block.
However, when attempting  RX-Radio RFNoC Block ->DDC RFNoC-> DUC
RFNoC->TX-Radio RFNoC Block, there is no signal output and no TX/RX RX2
link lights.
Changing the Block Instances to match the existing default x310 image core
Static connections made the flow graph run, but again with no lights or
output.

I found (through this mailing list) relevant material on this, the "Stupid
RFNoC Tricks: Loopback"  in removing timestamps on received signals.
https://corvid.io/2017/04/22/stupid-rfnoc-tricks-loopback/

But, the current UHD build does not have the same filesystem or files (from
what I can tell).

Looking for guidance or reference in order to build this repeater.

Robert
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