Hello list, First I apologise for posting in the Recovering x(t) from IQ
samples thread, please delete my post there if possible. I also removed my old
account from the list and created this new one.
I have recently changed the USRP clock with an external PLL. Then I used the
previously precompiled standard firmware std_4rx_0tx.rbf , using 2 sinusoidal
inputs (2.1 MHz) to RXA, RXB with the results confirming that everything was
working fine. I then downloaded the 3.0.4 version and tried to recompile the
usrp_std project. I used the usrp_std.rbf file produced with the rx_cfile.py,
feeding the RXA, RXB each with the same sinusoidal signal and when I plotted
the output I found out that I was getting 0 values only.
I then used again the std_4rx_0tx.rbf file which resulted in the expected
output (sinusoidal signals at the same frequency) with amplitudes ranging from
-15500 to 15500. . I then used another firmware which actually produces known
data from within the rx_buffer.v file, (a signal that cycles from 0 to 15 and
back to 0) and the output was as expected again, linear increase from 0 to 15
and then back to 0. I then tried other versions of the firmware that there were
working, as Peter Monta's variable width and shift firmware, but again I was
getting 0 values at this time.
Does anyone has an idea what might be wrong? Why do I get nothing at the output
when I use .rbf from the recompilation of the usrp_std project? Why some .rbfs
work and some not?
Thank you
Rigas Ioannides
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