[evlatests] FRING aborting, solved (from an AIPS perspective)

[Michael Rupen]

Hi Steve,

> I don't know what was agreed with Michel (and/or Francois) if anything but is 
> the intent of SDM to MS conversion that the sign of channel order be 
> determined by the netSideband value or by the sign of the chanFreqStep (I 
> would have expected the latter).  In any event, our filler is probably just 
> using the step (which Rich says is always a positive number in the SDM) and 
> not flipping it for LSB.  I'm not sure what ALMA intends either.
>
> In my quick test changing chanFreqStep to -500000.0 in the SDM gave the right 
> channel on import into CASA (havent checked that this works on export to 
> AIPS).
>
> If you think we should be using the netSideband then we'll file a JIRA for 
> Michel on this.  I will also ask Robert and Michel what they are expecting.
>


We've been discussing some related issues on the EVLA side, and I believe we 
decided we should in the end produce USB from the correlator in all cases. 
That has not been implemented yet however.

I'll be interested to hear what Robert & Michel think should be done.

Cheers,

           Michael