Thanks for the early reply Ralph.
>>> First of all, it is normal that the USRP is
not detected anymore with the uhd tools when it is claimed by
OpenBTS. So this looks not alarming.
Note that our successful implementation did not have any
issue with UHD-USRP connection. It worked as it was before
OpenBTS claims it. Hope this is 'actually normal' without
interrupting the main intended functions. Right? Could I know
the reason for USRP connection loss?
>>> Are you able to verify if RF is transmitted?
Is there some spectrum analyzer available, or a receiver that
can tune into the used GSM frequency, best is AM mode and open
squelch, to see if a carrier is present? This way you can find
out if it transmits at all, and if so, it must be continously,
uninterruptes, without stuttering.
Yes. Oh no! Surely transmission LED (labeled A) is not
working. Which means that there is a RF transmission problem
in our build. Reading through several threads on similar
problem, I don't think it is a hardware issue, rather
software compatibility issue. What would be the remedy for
>>> I assume your successful tests used the very
same USRP, so the frequency should not be off too far?!
Yes. The similar N210 version was tried with the same set
Could you please address above issues.