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.
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