Doesn't take long to knock one up.

Which bytes would you expect to be most common?

Hmm, I was expecting the 16 most frequent to be even more dominant based on my viewing a few of those files as hex. That is, I expected almost everything to be one of these:


Having 01010101 85 come in as the next most frequent pattern is very interesting. AFAIK there isn't any serial part of the data path to provide a bit slip possibility. I just hope a tech at Arecibo has been asked to look, I believe a few minutes with an oscilloscope would pin it down.
                                                                               Joe

Golly, don't you think a fully optimized version would be better? 

As noted in the NC forum, 07mr09aa B3_P1 WUs are OK but 08mr09aa have the problem (and thanks for confirming the latter). The 07mr09ab file is being split now, and from aoschedule I think it may get the start time of the problem down to within 12 hours or so.

While searching out those WUs, I was watching for old Astropulse WUs too. Saw one from Jan 18 2009 which I judge probably still being reissued. But I also saw two from early October 2008 which seem more likely to be victims of a database failure (and one MB from January 2007 too).
                                                                              Joe