[daip] More about the FITLD problem

[Amy Mioduszewski]

The FREQIDs that FITLD finds first are:
   5    3   26-SEP-2001  15:32:49     FITLD     Incoming FREQID #   1
   5    3   26-SEP-2001  15:32:49     FITLD     15357.49  15365.49
   5    3   26-SEP-2001  15:32:49     FITLD     Incoming FREQID #   2
   5    3   26-SEP-2001  15:32:49     FITLD     22225.49  22233.49
   5    3   26-SEP-2001  15:32:49     FITLD     Incoming FREQID #   3
   5    3   26-SEP-2001  15:32:49     FITLD      1659.49   1667.49
   5    3   26-SEP-2001  15:32:49     FITLD     Incoming FREQID #   4
   5    3   26-SEP-2001  15:32:49     FITLD      4987.49   4995.49

but the first frequency that is observed is 5GHz, so it sees data
from FREQID 4 first.  Might that throw FITLD in a loop?

This might also be consistent with how the first 4 FREQIDs are out of
order in the FQ table.  Also the first 4 entries in the FQ table make
much more sense if the "base" frequency is 15.4GHz rather than the
5GHz in the header.

COL. NO.        1             2               3             4             5
     ROW     FRQSEL     IF FREQ           CH WIDTH      TOTAL BAN     SIDEBAND
  NUMBER                HZ                HZ            HZ
       1        4        0.000000E+00     5.000E+05     8.000E+06         1
       1                 8.000000E+06     5.000E+05     8.000E+06         1
       2        2        6.868000E+09     5.000E+05     8.000E+06         1
       2                 6.876000E+09     5.000E+05     8.000E+06         1
       3        3       -1.369800E+10     5.000E+05     8.000E+06         1
       3                -1.369000E+10     5.000E+05     8.000E+06         1
       4        1        0.000000E+00     5.000E+05     8.000E+06         1

So is the first list of frequencies that FITLD finds somehow in the header
(or something) of the file that the correlator produces?  If so is this assumed
to be in the correct order so that this is a correlator problem and not
an AIPS problem.  I know why the frequencies are out of order, antenna 1 (BR)
sets the order of the frequencies in the frequency table in a correlator job.
BR started observing 36 minutes late and therefore started observing at 15GHz.

I talked to the analysts and they seem to think this is normal (that the freq
order is set by antenna#1).

Cheers,

Amy