> What is the sample rate of your transmitted samples?  If it isn't 200 Msps \
> for the X310, then you are using the DUC.

I use a couple different sample rates. The plots I showed earlier were taken at 
25 MSPs. 

> Not adding 0's to the end of a burst which you intend to be interpolated is \
> problematic in general, since you won't be flushing the FIR filters of \
> their current state.  Remember there is no automatic zero stuffing to push \
> the last of the data through.

What’s the point of the start/end burst flags then? In theory UHD should know 
the number of taps on the DUC/DDC for a given sample rate and be able to push 
zeros for me. How do I know how many zeroes I need to pad? I’ve apparently 
empirically determined it, but is there documentation somewhere?
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