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View this ticket online: <a href="https://help.nrao.edu/agent/#app.tickets,t:36263" 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/agent/#app.tickets,t:36263</a>
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Xiaofeng Li <lixf@gzhu.edu.cn> </td>
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Awaiting User
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Mac Intel OS11
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Hello Xiaofeng, Are the gscale amplitude correction values you shared for the 4.4 GHz data, or the 7.6 GHz data? If you notice in the VLBA_CBAND_GAINS.ANTAB file, the 4-6 GHz gain value...
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<!-- DP_MESSAGE_BEGIN --><div dir="ltr" lang="en" name="dp_message_166441_begin" class="dp_message_166441_begin"><div>Hello Xiaofeng,</div><div><br></div><div>Are the gscale amplitude correction values you shared for the 4.4 GHz data, or the 7.6 GHz data?</div><div><br></div><div>If you notice in the VLBA_CBAND_GAINS.ANTAB file, the 4-6 GHz gain values for LA are much larger than for the other stations. LA values are ~0.2, while the other stations are closer to ~0.1. I suspect the LA gain values are incorrect, and gscale is doing the correct thing to bring it more in line with the other stations.</div><div><br></div><div>I have noticed something similar when calibrating VLBA data from this time range. In radplot, the baselines to LA appear very low at first. Doing gscale shows large corrections for LA, but it looks more similar to the other stations in radplot after the correction.<br></div><div><br></div><div>If you are worried about LA causing problems, you can omit it while making the image for self-calibration. Then, perform amplitude self-calibration in AIPS and see if that brings LA in line with the other stations.</div><div><br></div><div>I hope that helps.</div><div><br></div><div>Justin<br></div><div><br></div></div><!-- DP_MESSAGE_END -->
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