[srsran-users] Only Narrow Band being emitted on downlink

[Arpad Kovesdy]

Hello,

We're testing a bladeRF micro 2.0 using srsRAN software release 22_10
powered by a 10th generation Intel NUC on DL_EARFCN of 3750 and n_prb of
25. Previously, we have gotten a clear LTE signal of the correct bandwidth
on 955.0 MHz which corresponds to the downlink frequency.

However, recently, we tried to connect our UEs and could not. So, we
analyzed the signal using a BB60C spectrum analyzer + the Spike software
and noticed that the typical bell curve-like LTE spectrum emission was
replaced by an incredibly narrow band of emissions at the exact right
frequency. No errors noted in srsENB logs either. Any suggestions are
appreciated. We tried removing any amplifiers that might have been damaged
before taking this spectrum capture (this turned out not to be the issue).

See image of spectrum capture of error:
 https://pasteboard.co/FaBXSdVCpCgy.png
<https://pasteboard.co/FaBXSdVCpCgy.png>

Thank you in advance,
Arpad.
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