[daip] FITLD broken?

[Adam Deller]

Hi Amy,

An example can be found at

/home/marathon2/data/1023+0038/bd141a/BD141A_UG_HPOL4IF8MHZ16CH_1.6515GHZ00

Although I suspect any and all VLBA hardware correlator data is
probably affected.

Cheers,
Adam

On Wed, Jun 16, 2010 at 10:09 AM, Amy Mioduszewski <amiodusz at nrao.edu> wrote:
> Yea, Eric made some changes.  Point me at the data you are using.  Although
> I cannot promise too much since I am taking Thurs/Friday off.
>
> Amy
>
> Adam Deller wrote:
>>
>> Hi Amy,
>>
>> Running from version 'NEW' works.  Running from 'TST' does not.  I
>> notice they have different adverbs, so obviously some code surgery has
>> been done somewhere.
>>
>> Cheers,
>> Adam
>>
>> On Wed, Jun 16, 2010 at 9:22 AM, Amy Mioduszewski <amiodusz at nrao.edu>
>> wrote:
>>>
>>> Ack, and Eric isn't here.  Can you test it in version 'new'?
>>>
>>> Thanks!
>>>
>>> Amy
>>>
>>> Adam Deller wrote:
>>>>
>>>> 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
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