<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><span style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);" class="">I updated the Jira ticket with a note saying I saw about a 24hr period with some instances of ea27 showing phase jumps for L and C band May 08-09, then I don’t see more notes from our pipeline records about it until June 6 for PI science, then some in VLASS. The C band data were 3bit. </span><br class=""><div class="">
<div style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"><br class="Apple-interchange-newline"><br class=""></div><div style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"><br class=""></div><div style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;">Drew Medlin<span class="Apple-tab-span" style="white-space: pre;"> </span></div><div style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"><a href="mailto:dmedlin@nrao.edu" class="">dmedlin@nrao.edu</a><br class=""><br class="">VLA Scientific User Support<br class="">National Radio Astronomy Observatory</div>
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<div><br class=""><blockquote type="cite" class=""><div class="">On Jun 30, 2023, at 11:25 AM, Rob Long via evlatests <<a href="mailto:evlatests@listmgr.nrao.edu" class="">evlatests@listmgr.nrao.edu</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div class="">If we have a loose connection between the L300 and LO or DTS splitters, something like this could occur. Do we see this effect in both 8-bit and 3-bit?<br class=""><br class="">Rob<br class=""><br class="">On 6/30/2023 11:22 AM, Rick Perley via evlatests wrote:<br class=""><blockquote type="cite" class="">following up on Bryan's point: The changes were by many tens of degrees on a timescale of 10 minutes. It was stable within the calibrator scan, then hopped to an entirely different number 10 minutes later ...<br class=""><br class="">No way a baseline error can do that...<br class=""><br class="">Rick<br class=""><br class="">On 6/30/23 11:04, Bryan Butler wrote:<br class=""><blockquote type="cite" class=""><br class="">It's a good point, but that wouldn't cause the behavior that Rick sees. It would cause a diurnal sinusoidal error which got worse with higher frequency, not random amounts for all bands, and changing between scans. Seems like a loose connection maybe? But would have to be after the converters.<br class=""><br class=""> -Bryan<br class=""><br class=""><br class="">Catarina Ubach via evlatests wrote on 6/30/23 10:48:<br class=""><blockquote type="cite" class="">Antenna 27 baselines parameters have not been updated.<br class=""><br class="">Catarina<br class=""><br class="">-----Original Message-----<br class="">From: evlatests <<a href="mailto:evlatests-bounces@listmgr.nrao.edu" class="">evlatests-bounces@listmgr.nrao.edu</a>> On Behalf Of Rick Perley via evlatests<br class="">Sent: Friday, June 30, 2023 10:09 AM<br class="">To: <a href="mailto:evlatests@aoc.nrao.edu" class="">evlatests@aoc.nrao.edu</a><br class="">Subject: [evlatests] Phase stability of ea27<br class=""><br class=""> From data taken last night, it is noted that ea27's phase changes by large, and seemingly random amounts at all bands observed (L, S, C, X, and Ku). This occurs between scans, and is not seen on other antennas.<br class=""><br class="">Rick<br class=""><br class="">_______________________________________________<br class="">evlatests mailing list<br class=""><a href="mailto:evlatests@listmgr.nrao.edu" class="">evlatests@listmgr.nrao.edu</a><br class="">https://listmgr.nrao.edu/mailman/listinfo/evlatests<br class=""><br class="">_______________________________________________<br class="">evlatests mailing list<br class="">evlatests@listmgr.nrao.edu<br class="">https://listmgr.nrao.edu/mailman/listinfo/evlatests<br class=""></blockquote></blockquote><br class="">_______________________________________________<br class="">evlatests mailing list<br class=""><a href="mailto:evlatests@listmgr.nrao.edu" class="">evlatests@listmgr.nrao.edu</a><br class="">https://listmgr.nrao.edu/mailman/listinfo/evlatests<br class=""></blockquote><br class="">_______________________________________________<br class="">evlatests mailing list<br class=""><a href="mailto:evlatests@listmgr.nrao.edu" class="">evlatests@listmgr.nrao.edu</a><br class="">https://listmgr.nrao.edu/mailman/listinfo/evlatests<br class=""></div></div></blockquote></div><br class=""></body></html>