[daip] ACFIT

[Jim Ulvestad]

Colleen Schwartz wrote:
> 
> Hi,
> 
> For tasks like ACFIT and KRING where there is no input for BIF or EIF,
> does AIPS recognize which IF you want?  For instance, if all your signal
> is in IF2, and you try to run ACFIT on IF2 channels 100-300, will AIPS use
> those channels or will it use IF1?
> 
> Thanks,
> Colleen Schwartz

Hi Colleen, 

No AIPS does not recognize what IF you want.  In fact, KRING and FRING
have no capability of picking individual IFs, nor does ACFIT.  What
I would recommend doing is using UVCOP or SPLAT to copy the desired
IF into a separate file, run KRING or ACFIT  on that file to produce
the desired SN table, and copy the SN table back to the original
data set using TACOP.

I haven't done this myself, so how you apply the SN table will depend
on exactly what you're trying to do.  For instance, if you want to use
one IF to get the solution, but then apply that to the calibration of
all
IFs, I'm not sure exactly how to do it, because you presumably need an
SN table that covers all the IFs.

If you can be a little more specific about exactly what you want to do
with the results of ACFIT or KRING, I can probably figure out how to do
it.  But I don't want to go down some specific path where I might be
wasting my time, without more information. 

Please let me know if I've given you enough to go on, or if you need
me to go further on some specific path.

Best,

Jim Ulvestad