[daip] [!10702]: AIPS - Phase wraps 3C84

[Jared Rice]

Phase wraps 3C84
----------------

           Ticket ID: 10702
                 URL: https://help.nrao.edu/staff/index.php?/Tickets/Ticket/View/10702
           Full Name: Jared Rice
               Email: jrice at physics.unlv.edu
             Creator: User
          Department: AIPS Data Reduction
       Staff (Owner): Amy Mioduszewski
                Type: Issue
              Status: Open
            Priority: Default
                 SLA: NRAO E2E
      Template Group: Default
             Created: 19 July 2017 10:09 PM
             Updated: 20 July 2017 07:09 PM
                 Due: 24 July 2017 07:09 PM (4d 0h 0m)
      Resolution Due: 28 July 2017 07:09 PM (8d 0h 0m)



Okay, one more email! I believe the problem is fixed.

I took a look at the usno_finals.erp file that VLBAEOPS downloaded 
automatically. It returned an HTML header that said the url had moved! 
So the table of times was not present which would explain the crazy 
phase wrapping, etc.

The solution was to manually download the usno_finals.erp file and run 
CLCOR with OPCODE 'EOPS'.

Things are looking better. Thank you for your help!

Regards,
    Jared

On 7/20/17 11:37 AM, Jared Rice wrote:
> Dear Amy,
>
> We just deleted all the SN tables back to 0 and CL tables back to 1 
> and re-ran VLBAEOPS. The problem seems to stem from there. We received 
> this weird message after running VLBAEOPS:
>
> DEIMOS> CLCOR1: CL version input   1 output   2
> DEIMOS> CLCOR1: !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
> DEIMOS> CLCOR1: !  OPTYPE=EOPS is used for proper CT tables only !
> DEIMOS> CLCOR1: !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
> DEIMOS> CLCOR1: UT1-UTC(sec), POLX, POLY(milliasec) used by correlator
> DEIMOS> CLCOR1:     1  -1.  0.418959    40.530   434.250
> DEIMOS> CLCOR1:     2   0.  0.417560    41.690   435.380
> DEIMOS> CLCOR1:     3   1.  0.416080    43.180   436.650
> DEIMOS> CLCOR1:     4   2.  0.414518    45.200   437.940
> DEIMOS> CLCOR1:     5   3.  0.412900    47.650   439.170
> DEIMOS> CLCOR1: ZTXOP2: using translated file name =
> DEIMOS> CLCOR1: ZTXOP2: /tmp/usno_finals.erp
> DEIMOS> CLCOR1: UT1-UTC(sec), POLX, POLY(milliasec) picked up from the 
> USNO file
> DEIMOS> CLCOR1:     1********** ********************************
> DEIMOS> CLCOR1:     2********** ********************************
> DEIMOS> CLCOR1:     3********** ********************************
> DEIMOS> CLCOR1:     4********** ********************************
> DEIMOS> CLCOR1:     5********** ********************************
>
> Seems the times did not show up and it just shows a load of asterisks. 
> Can you reproduce this issue on your end or give your insight?
>
> Regards,
>    Jared
>
> On 7/20/17 11:02 AM, Jared Rice wrote:
>> Dear Amy,
>>
>> The IFs are contiguous so there is no issue there. We removed the CL 
>> and SN tables created by VLBAPCOR and then we ran VLBAMPCL. There 
>> were 16 good solutions, 144 failures for 3C84. Maybe there is still 
>> an issue with 31DEC15 version? Would it be possible to run the 6cm 
>> data through the pipeline over there?
>>
>> Regards,
>>    Jared
>>
>> On 7/20/17 8:00 AM, NRAO Helpdesk wrote:
>>> Dear Jared,
>>>
>>> Those phases do look terrible.  Phase wraps after VLBAPCOR aren't necessarily "bad" but this correction should remove any phase jumps between the IFs.  Is the frequency continuous between the IFs?  There probably nothing wrong with the version of AIPS you are running, I suspect there is something wrong with the values in the PC table.  The simple solution is to run VLBAMPCL which does a manual phase cal (using FRING) and that should fix things nicely.    Remember to remove the CL and SN tables made by VLBAPCOR with EXTD.
>>>
>>>
>>>
>>> Amy Mioduszewski
>>> VLA Scheduling Manager
>>> NRAO
>>>
>>>
>>> Ticket Details
>>> ---------------------------------
>>> Ticket ID: 10702
>>> Department: AIPS Data Reduction
>>>
>>> Support Center:https://help.nrao.edu/index.php?/Tickets/Ticket/View/10702
>>
>




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