[daip] Bug in DBCON affecting combination of UV datasets

[Tim Cornwell]

Dear AIPS,

I have two data files that I wish to combine into one using DBCON.
Unfortunately since the frequencies are different DBCON loses
information about the frequencies of the second dataset. I show below
the results of running PRTAB on the two input data sets and the
DBCON'ed dataset. Using DOPOS(2,1)=1 has no effect on this bug.

This is serious and will affect the ability of many users to
transfer data to AIPS++ for processing.

Thanks,

Tim Cornwell


ORION.D     .L BAND.   1  Disk= 1    FQ Table version   1
Title: AIPS FQ
Created by      FITLD on 24-FEB-2000 14:43:36
Last written by FITLD on 24-FEB-2000 14:43:36
Ncol   5  Nrow       1    Sort cols:
    Table has     1 keyword-value pairs:
   NO_IF    =            2
   Table format incompatable with FITS ASCII tables

COL. NO.         1              2               3              4              5
     ROW      FRQSEL      IF FREQ           CH WIDTH       TOTAL BAN      SIDEBAND
  NUMBER                  HZ                HZ             HZ
       1         1        0.000000E+00      2.500E+07      2.500E+07          1
       1                  5.000000E+07      2.500E+07      2.500E+07          1

ORION.C     .L BAND.   1  Disk= 1    FQ Table version   1
Title: AIPS FQ
Created by      FITLD on 24-FEB-2000 14:59:32
Last written by FITLD on 24-FEB-2000 14:59:32
Ncol   5  Nrow       3    Sort cols:
    Table has     1 keyword-value pairs:
   NO_IF    =            2
   Table format incompatable with FITS ASCII tables

COL. NO.         1              2                3              4              5
     ROW      FRQSEL      IF FREQ            CH WIDTH       TOTAL BAN      SIDEBAND
  NUMBER                  HZ                 HZ             HZ
       1         1         5.529728E-08      1.250E+07      1.250E+07          1
       1                   5.000000E+07      1.250E+07      1.250E+07          1
       2         2         3.438950E+09      5.000E+07      5.000E+07          1
       2                   3.388950E+09      5.000E+07      5.000E+07          1
       3         3        -4.687500E+06      3.125E+06      3.125E+06          1
       3                   4.531250E+07      3.125E+06      3.125E+06          1

After DBCON, I get:

ORION.CD    .DBCON .   1  Disk= 1    FQ Table version   1
Title: AIPS FQ
Created by      FITLD on 24-FEB-2000 14:43:36
Last written by FITLD on 24-FEB-2000 16:01:47
Ncol   5  Nrow       1    Sort cols:
    Table has     1 keyword-value pairs:
   NO_IF    =            2
   Table format incompatable with FITS ASCII tables

COL. NO.         1              2               3              4              5
     ROW      FRQSEL      IF FREQ           CH WIDTH       TOTAL BAN      SIDEBAND
  NUMBER                  HZ                HZ             HZ
       1         1        0.000000E+00      2.500E+07      2.500E+07          1
       1                  5.000000E+07      2.500E+07      2.500E+07          1