<font face="Verdana, Arial, Helvetica" size="2">Thomas Krichbaum updated #13084<br />
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DTSIM, new mount types<br />
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<div style="margin-left: 40px;">Ticket ID: 13084</div>
<div style="margin-left: 40px;">URL: <a href="https://help.nrao.edu/staff/index.php?/Tickets/Ticket/View/13084">https://help.nrao.edu/staff/index.php?/Tickets/Ticket/View/13084</a></div>
<div style="margin-left: 40px;">Name: Thomas Krichbaum</div>
<div style="margin-left: 40px;">Email address: <a href="mailto:tkrichbaum@mpifr-bonn.mpg.de">tkrichbaum@mpifr-bonn.mpg.de</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): -- Unassigned --</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: 29 November 2018 05:56 PM</div>
<div style="margin-left: 40px;">Updated: 29 November 2018 05:56 PM</div>
<div style="margin-left: 40px;">Reply due: 03 December 2018 05:56 PM (4d 0h 0m)</div>
<div style="margin-left: 40px;">Resolution due: 25 August 2021 12:00 AM (999d 6h 4m)</div>
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Dear colleague, <br /><br />we are testing DTSIM for simulating polarisation data where stations have non-zero and occasionally high Dterms. We are using DTSIM for proposal preparation, but also in view of high frequency VLBI with new stations, which do not all have very small D-terms (eg. ALMA, the LMT or the new Greenland Telescope).<br /><br />In this context I have 2 questions. A simple one and or more complicated one.<br /><br />1. Can you please confirm that for non-zero station D-terms the visibilities are altered in the correct way. Is there any assumption that the D-terms should be low (like it is assumed in LPCAL)? I used VPLOT to check if the RL/LL ratio depends on the Dterm, which was entered. I verified that non-zero Dterms have an effect on the data, which is good. At this point I wonder if there is some knowledge (or document) about possible approximations when calculating the antenna cross-talk. <br /><br />2. Would it be possible to add the Nasmyth mount-type to DTSIM. Several of the newer GMVA/EHT VLBI stations have a Nasmyth mount. The Nasmuth mounts were already implemended in AIPS some years ago (e.g. Mount=NS-R has mount type code 4 and Mount=NS-L has mount type code 5). So it would be really great if DTSIM would know them.<br /><br />Thanks a lot,<br /><br /> Thomas
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