<font face="Verdana, Arial, Helvetica" size="2">Lynn Matthews updated #14061<br />
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PCAL with SPECTRAL=1<br />
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<div style="margin-left: 40px;">Ticket ID: 14061</div>
<div style="margin-left: 40px;">URL: <a href="https://help.nrao.edu/staff/index.php?/Tickets/Ticket/View/14061">https://help.nrao.edu/staff/index.php?/Tickets/Ticket/View/14061</a></div>
<div style="margin-left: 40px;">Name: Lynn Matthews</div>
<div style="margin-left: 40px;">Email address: <a href="mailto:lmatthew@haystack.mit.edu">lmatthew@haystack.mit.edu</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): Eric Greisen</div>
<div style="margin-left: 40px;">Type: Issue</div>
<div style="margin-left: 40px;">Status: Open</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 June 2019 02:16 PM</div>
<div style="margin-left: 40px;">Updated: 18 June 2019 11:41 AM</div>
<div style="margin-left: 40px;">Resolution due: 12 March 2022 07:00 PM (998d 8h 19m)</div>
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I tried again withICHANSEL=0, and the results suggest that having ICHANSEL non-zero when using smoothing is a very<br />bad idea. The attached shows the original PD table (green) overplotted with the PD table generated with ICHANSEL=0 (yellow). <br />They are identical across the inner band, but outside the ICHANSEL range both amplitude and phase show spurious jumps.<br /><br />In the case of spectral data with lots of channels, it seems that it would be better to be able to fit a smoother function (e.g., a low-order polynomial) rather than trying to smooth out the data before fitting. For now though I think I will ignore this correction given the narrow band.<br /><br />Lynn<br /><br />Lynn
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