16APSK / 32APSK / Constellation diagrams

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Hi

I see the constellation diagrams in the wiki for the 16APSK / 32APSK
support on the STV0900A based cards. How were these constellation
diagrams produced? Is there any source kicking around for this?

I would like to be able to give a frequency and symbolrate, and get a
similar constellation diagram back (in quasi realtime?), obviously
using a STV0900A based card. I know there's a windows program that
does this (crazyscan) but it would be nice to be able to do it in
linux. I don't expect any polished programs, but any source that shows
how to do this (i.e. get raw I and Q data from the card) would be very
handy.

Thanks,
Andrew
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