[daip] APCAL error

[Eric Greisen]

Arnaud Collioud wrote:
> Dear AIPS developers,
> 
> I am processing the session RDV84 (Dec 2010) with 31DEC11 AIPS version.
  I am trying to build SN tables from GC and TY tables  (5 subarrays), but

  I am encountering an error with the task APCAL (see below).
> 
> APCAL1: Task APCAL  (release of 31DEC11) begins
> APCAL1: Writing SN table  1
> PCAL1: AMPCAL: NO GAIN FOR ANT:   3 POL: 1 IF:    3
> APCAL1: Purports to die of UNNATURAL causes
> APCAL1: localhos 31DEC11 TST: Cpu=      0.2  Real=      0  IO=        15

Actually the task needed to fill the tables is ANTAB and I suspect that 
this error message states that antenna 3 IF 3 did not get filled in the 
GC table or the TY table.  The task PRTAB is of some use in this - if 
you had a current 31DEC11 version PRTAB has new options to limit the 
display to selected rows such as those of antenna 3 - older versions do 
not have this option.  ANTAB is a tricky program and it is possible to 
let some values slip through the cracks.

Eric Greisen