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View this ticket online: <a href="https://help.nrao.edu/app#app.tickets,t:37451" title="(#)" style="color: #0065A3; font-family: Helvetica, Arial, sans-serif; font-weight: normal; padding: 0; margin: 0; text-align: left; line-height: 1.3; text-decoration: underline;">https://help.nrao.edu/app#app.tickets,t:37451</a>
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Francesco Ubertosi <francesco.ubertosi2@unibo.it> </td>
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Awaiting User
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Mac OS12
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Hiya Francesco. Other than having to deal with the shorter coherence times there’s nothing really different about reducing K/Q band data (and the issues with Q band sources being weaker...
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<!-- DP_MESSAGE_BEGIN --><div dir="ltr" lang="en" name="dp_message_172056_begin" class="dp_message_172056_begin"><div>Hiya Francesco.<br>Other than having to deal with the shorter coherence times there’s nothing really different about reducing K/Q band data (and the issues with Q band sources being weaker in general).<br>Do you detect a fringe finder at Q band? If so trying to remove instrumental delay using FRING on that scan only and applying that to the whole experiment, then using CALIB as you mention should give you the best SNR.</div><div>If your calibrator isn’t detected using that then you’re probably out of luck... Sources are much more variable the higher in frequency you go.<br>The KVN detected it at K band at 190 mJy in 2017 it looks like.</div><div>I suggest also looking at a scan on it with POSSM and seeing if you see any sign of fringes by eye - if not it’s pretty unlikely you’ll be able to fringe on it.<br>Here I’ve taken a super quick look at your data and attached a quick screenshot of POSSM for your fringe finder (clear fringes) and your phasref (no sign of fringes).</div><div>I’ve also attached the sniffer plot for your observation which attempts to fringe everything - again you can clearly see a good delay found for the two fringe finder scans but nothing else - note that this is less sensitive (I think it averages every 30s but don’t quote me) but also not a good sign.</div><div>So yeah I think I agree with your assessment that the fringe finder is not detected. Sorry!</div><div>Jay</div></div><!-- DP_MESSAGE_END -->
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