On 08/08/2018 02:29 PM, Sayyed Dormiani Tabatabaei via USRP-users wrote:
Hello,
I am trying to debug a channel sounder I made in GNUradio. As a sanity
check, I made a new project that sends a sin into TX0 and Nulls into
the other three TX. After attaching a spectrum analyzer to TX0 and
running the sin project I get very strange and incoherent results.
(N310 - SMA - 30dB attenuator - SMA2BNC - RSA 3408A Spectrum Analyzer)
I suspect there is an issue with my sampling rate choices. What would
be a reasonable sampling rate choice for a sanity check?
I understand that the chosen sampling rate should be an even factor of
one of the four master clocks that the N310 supports. However, when I
pick low-ish rates (KHz range) the result is a garbage saw-tooth in
time domain and a strange step-like pyramid in frequency domain.
Higher sampling rates (MHz scale) cause GNUradio to crash and lock up.
(I am changing the sin frequency every time I change the sampling rate
to keep things in line with Nyquest-Shannon)
Thank you for the help in advance.
Ali
PS: Currently recompiling UHD and GNUradio to get the 13.0.0.1 update.
The lowest-possible sample rate is: master_clock_rate/1024
The default master clock on N310 is 125MHz
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