[daip] FITLD broken?
Adam Deller
adeller at nrao.edu
Wed Jun 16 12:20:32 EDT 2010
Hmmm, ok. Yes, this is a partially processed file (and so are all the
others I found to be faulty). I'm guessing its a date problem (either
with the epoch or with the observation) somewhere.
Cheers,
Adam
On Wed, Jun 16, 2010 at 10:15 AM, Amy Mioduszewski <amiodusz at nrao.edu> wrote:
> Hi Adam,
>
> Can't be since I loaded some hardware correlator data on the weekend and it
> was fine. Also that looks like one of the partially processed files (rather
> than the correlator job files), is that correct?
>
> Amy
>
> Adam Deller wrote:
>>
>> 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
Socorro NM 87801, USA
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