Hi all,
First, I'm sorry if my actions are shunned upon (C++ daughterboard code
outside the mainstream repository), but I could sincerely use help with
a deadline approaching next week.
I am trying to use code that Per started for tuning a MIMO_b RFX card in
C++. Using the base code he gave me, I was able to get the transmitter
working bot not receiver.
I am trying to receive a GMSK transmission.
Here is a normal reception after tuning the card in python:
http://cyprus.cmcl.cs.cmu.edu/tmp/flex_graphs/gmsk_regular.jpg
http://cyprus.cmcl.cs.cmu.edu/tmp/flex_graphs/gmsk_regular_rvi.jpg
... we get a nice clean circular transmission.
When I attempt to receive using the C++ RX code, that I modified to set
the RX gain, I get the following square-like transmission:
http://cyprus.cmcl.cs.cmu.edu/tmp/flex_graphs/gmsk_flex.jpg
http://cyprus.cmcl.cs.cmu.edu/tmp/flex_graphs/gmsk_flex_rvi.jpg
Based on these results, does anyone have any insight in to what I may be
tuning incorrectly? I thought it might be the gain setting, but I
mimiced the set_gain() method exactly with the python code and ensure
the write_aux_dac() and set_pga() values are the same:
https://moo.cmcl.cs.cmu.edu/trac/cmu_sdrg/browser/dboard_code/db_flexrf_mimo.cc#L193
To tune the cards, I am using:
db_flexrf_mimo dboards(d_urx, d_utx, 0);
dboards.configure(d_rf_freq, 45, 0);
dboards.configure(d_rf_freq, 0, 1);
dboards.select_tx();
I followed through almost every function call and I can't seem to find
the different in tuning between my code and the python.
I'd greatly appreciate any insight.
Thanks!
George
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