Hi,
I'm trying to get a FM audio transmission around 100MHz from the USRP 2 with
the Basic TX board but the output signal when viewed on spec analyser is not
constant and seems to sweep and not be stable. Have tried the examples supplied
with no success at generating meaningful output from the USRP2, to debug this
I've fed the output from the WBFM encoder module back into a WBFM decoder which
works so I'm wondering if I've got the correct USRP2 settings and have some
questions below:
The Basic TX board has 2 outputs, when fed with a complex signal does that mean
that TX A output has the I and TX B the Q signal ? The D/As are rated at
100MS/S but with interpolation can output 400MS/S, which I assume means it can
generate a maximum 200MHz signal (nyquist rate)
What is the purpose of the USRP sink frequency ? does this feed the digital up
converter which it mixes with the baseband input signal ?
In my example if I have an audio signal (samp rate 32KHz) fed into a WBFM (with
same samp rate and quadrate at 320K) what should I set the interpolation rate
to on the USRP to ? I though this should be 100Ms/320K which is 312.5, which
doesn't seem to fix the problem.
Am using latest GIT build of Gnu Radio with latest FPGA and firmware (non UHD).
I'm also a newbie so I'm on a steep learning curve so grateful for any help.
Thanks
Chris
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