[daip] [Fwd: Pulse-cals after VBGLU]

[Craig Walker]

Edward Boyce reported the following problems to me recently.  After some 
chasing about, we determined that the problem is most likely that the 
state counts in the PC table are not properly combined by VBGLU.  Where 
the number of entries in the columns for pulse cal information doubles 
after VBGLU, the number of entries in the state count entries remains 
the same.  Thus the basic structure of the table changes and is probably 
not correct.  Despite the fact that PCCOR does not use the state counts, 
  to my knowledge, it does not like the malformed table.

Cheers,

Craig


-------- Original Message --------
Subject: Pulse-cals after VBGLU
Date: Fri, 26 Jan 2007 22:10:32 +0000 (GMT)
From: Edward Boyce <Edward.Boyce at manchester.ac.uk>
To: Craig Walker <cwalker at nrao.edu>

Dear Craig,

I'm processing HSA data observed at 512 Mb/s, dual circular polarisation,
64 MHz bandwidth. 2 correlator passes were necessary, and I joined the two
resulting UV data sets with VBGLU.

When I try to remove the instrument delays using the pulse-cals, PCCOR
won't run, giving the following error:
PCCOR1: All rows of the PC table are bad for the selected parameters
PCCOR1: Purports to die of UNNATURAL causes

PCCOR works on either half of the data individually, so there's no problem
with the initial PC tables. The initial PC tables are sorted by antenna
and then time, while VBGLU produces a table sorted by time and then by
antenna. I resorted the PC table for the combined data so it's sorted
by antenna and then by time, but PCCOR still doesn't run. After
sorting, the only difference is that the single pass PC table rows have
four frequencies, the combined PC table rows have eight (giving eight
values for quantities such as PC_REAL).

Am I missing something obvious, or is PCCOR simply unable to handle a PC
table covering eight different frequencies?

- Edward.

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