[daip] New Staff Reply - [!KQH-524344]: IMAGR bug

[Eric Greisen]

New Staff Reply: IMAGR bug

I am still working on this bug and it is disturbing
to me - not that it will stop you because you have
work arounds - but it could cause others serious
problems.

The failure occurs when doing DFT on Gaussian components
with n equal size frequency groups plus an additional
smaller frequency group.  But it is not the smaller
group that gets messed up - it is all of the first
group but only some of the time.

Your work-around is to insure that FQTOL is set to get
regular groups (after BCHAN, ECHAN, BIF, EIF) remembering
that you have 512 channels in each of two well separated
frequencies.  You probably want fairly small frequency
groups since the beam effects are significant.

Eric Greisen


Ticket Details
===================
Ticket ID: KQH-524344
Department: AIPS Data Processing
Priority: Default
Status: Open
Link:  https://help.nrao.edu/staff/index.php?_m=tickets&_a=viewticket&ticketid=2181