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View this ticket online: <a href="https://help.nrao.edu/app#app.tickets,t:38713" 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:38713</a>
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Ailing Wang <wangal@ihep.ac.cn> </td>
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Awaiting User
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Redhat 7-64bit
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Hello Aillin, I’m sorry it took so long to get back to you on this. I looked over your calibration steps (thank you for including such detailed notes!), and I have a few recommendations...
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<!-- DP_MESSAGE_BEGIN --><div dir="ltr" lang="en" name="dp_message_177539_begin" class="dp_message_177539_begin"><div>Hello Aillin,</div><div>I’m sorry it took so long to get back to you on this.</div><div>I looked over your calibration steps (thank you for including such detailed notes!), and I have a few recommendations:</div><div>First, when you load the data with FITLD, try using a slightly shorter clint. I usually go with 10 seconds (clint 1/6).</div><div>Second, try doing the TEC (VLBATECR) and EOP (VLBAEOPS) corrections before VLBACCOR. Even at C-band, the ionosphere can sometimes be a problem. And it is always a good idea to do the EOP correction, just in case there were significant changes that did not make it into the correlator model.</div><div>Third, try using VLBAMPCL instead of VLBAPCOR. VLBAMPCL does the instrumental delay “manually” (with a short fringe fit) rather than using the phase-cal tones. Many users have reported getting better delay calibration this way. Try limiting the time range to about one minute on your bandpass calibrator.</div><div>Fourth, do your global FRING before you do the bandpass calibration. BPASS also tries to solve for the phases, and often having the phases already cleaned up from FRING will improve the results of BPASS. Also, if you are seeing more than about 10% failure rate in FRING, you might need to use a long solint (maybe 30 seconds?).</div><div>Fifth, after the global FRING, try using two point interpolation in CLCAL (interp ‘2pt’). I have seen things go wrong with ‘ambg’, occasionally.</div><div>I hope this helps! Let me know if you have any questions or if you run into any more problems.</div><div>Justin</div></div><!-- DP_MESSAGE_END -->
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