[USRP-users] UBX coherence between TX and RX
Michael R. Freedman
mfreedman at ll.mit.edu
Sat Mar 23 17:06:23 EDT 2019
I have an issue where I tune both the TX and RX side of a UBX40 card in
an X310 to the same frequency and find that the transmitted signal and
what is received are not coherent. I am using an external 10MHz
reference and have tried the documented suggestions.
at 150MHz it is coherent.
at 155MHz it is NOT coherent.
I have tried setting the dboard_clock_rate to 20MHz. This made the
problem appear at 150MHz as well. I've tried integer_n tuning.
I have verified that the ref_lock and lo_lock are both true.
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