<font face="Verdana, Arial, Helvetica" size="2">Amy Mioduszewski updated #14796<br />
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Unstable phases on the GBT<br />
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<div style="margin-left: 40px;">Ticket ID: 14796</div>
<div style="margin-left: 40px;">URL: <a href="https://help.nrao.edu/staff/index.php?/Tickets/Ticket/View/14796">https://help.nrao.edu/staff/index.php?/Tickets/Ticket/View/14796</a></div>
<div style="margin-left: 40px;">Name: James Miller-Jones</div>
<div style="margin-left: 40px;">Email address: <a href="mailto:james.miller-jones@curtin.edu.au">james.miller-jones@curtin.edu.au</a></div>
<div style="margin-left: 40px;">Creator: User</div>
<div style="margin-left: 40px;">Department: AIPS Data Reduction</div>
<div style="margin-left: 40px;">Staff (Owner): Amy Mioduszewski</div>
<div style="margin-left: 40px;">Type: Issue</div>
<div style="margin-left: 40px;">Status: Response Overdue</div>
<div style="margin-left: 40px;">Priority: Default</div>
<div style="margin-left: 40px;">SLA: NRAO E2E</div>
<div style="margin-left: 40px;">Template group: Default</div>
<div style="margin-left: 40px;">Created: 17 September 2019 06:09 AM</div>
<div style="margin-left: 40px;">Updated: 23 September 2019 12:41 PM</div>
<div style="margin-left: 40px;">Reply due: 25 September 2019 06:20 AM (1d 17h 38m)</div>
<div style="margin-left: 40px;">Resolution due: 18 June 2022 05:00 PM (999d 4h 18m)</div>
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Hi James,<br /><br />Phase and delay jumps are basically the same thing. If you use PCCOR to calibrate the instrumental delays in the original calibration, this should have corrected the phase jumps. In other words, just run PCCOR as normal. You should examine the PC for the GBT, it is possible (I"ve seen this before on old data) that the PC will not have been sampled often enough for this purpose.
<br />Amy Mioduszewski<br />VLA Scheduling Manager<br />NRAO
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