[daip] FITLD broken?

[Adam Deller]

Hi,

There is something very strange going on with FITLD for VLBA data in
AIPS - it is scrambling the SU table for some files (but not all).  I
have checked out this particular file (you can see it at
/home/marathon2/data/1023+0038/bd141a/BD141A_UG_HPOL4IF8MHZ16CH_1.6515GHZ00)
using fv and see a sensible looking SU table.  However, as soon as I
load it into AIPS with FITLD the SU table reads:

       1    5.0000000000D+05    1.4176255806D+02     3.9039125519D+01
  2.0000000000D+03    1.0792773795D+02    4.5395855014D+01
       2    5.0000000000D+05    1.5612327792D+02    -8.8208229444D-01
  2.0000000000D+03    1.3016422419D+02    7.9956464878D+00
       3    5.0000000000D+05    1.5591154583D+02     4.0463333333D-01
  2.0000000000D+03    1.2979993496D+02    9.2488222431D+00
       4    5.0000000000D+05    1.5271527786D+02    -2.0054371833D+00
  2.0000000000D+03    1.2689149360D+02    6.4704735040D+00

where the columns are channel bandwidth, RA epoch (deg), Dec epoch
(deg), Epoch (years), RA apparent (deg) and Dec apparent (deg).  You
can see that the apparent source positions have changed by many
degrees - something is amiss.  I tried running FITLD from 31DEC09 but
got the same result.  This is data from the hardware correlator from
late 2008.

Cheers,
Adam

-- 
!=============================================================!
Dr. Adam Deller                            Ph  +1 575 835 7492
Jansky Fellow                               Fax +1 575 835 7027
National Radio Astronomy Observatory
Socorro NM 87801, USA
!=============================================================!