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Some Notes on VLA / EVLA gain curves and fluxscale - Revision history
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2012-03-16T20:43:12Z
<p>moved <a href="/index.php?title=Some_Notes_on_VLA_/_EVLA_gain_curves_and_fluxscale" title="Some Notes on VLA / EVLA gain curves and fluxscale">Some Notes on VLA / EVLA gain curves and fluxscale</a> to <a href="/index.php?title=Some_Notes_on_VLA_/_EVLA_gain_curves_and_fluxscale" title="Some Notes on VLA / EVLA gain curves and fluxscale">some Notes on VLA / EVLA gain curves and fluxscale</a>: Converting page titles to lowercase</p>
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<td colspan="1" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 16:43, 16 March 2012</td>
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https://casaguides.nrao.edu/index.php?title=Some_Notes_on_VLA_/_EVLA_gain_curves_and_fluxscale&diff=3907&oldid=prev
Dk3wc at 21:20, 7 June 2010
2010-06-07T21:20:56Z
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 17:20, 7 June 2010</td>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>[[Category:VLA]][[Category:EVLA]]</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>[[Category:VLA]][[Category:EVLA]]</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Some of the EVLA antennas have significant amplitude gain curvature as a function of elevation, owing perhaps to</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Some of the EVLA antennas have significant amplitude gain curvature as a function of elevation, owing perhaps to</div></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>whatever the attenuation and AGCs are doing (or not). Ideally, to derive the flux density of your secondary calibrators using ''<del style="font-weight: bold; text-decoration: none;">[[</del>fluxscale<del style="font-weight: bold; text-decoration: none;">]]</del>'', you may want initially to use only the few hours in the middle of an observation, when the calibrator is at higher elevation.</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>whatever the attenuation and AGCs are doing (or not). Ideally, to derive the flux density of your secondary calibrators using ''<ins style="font-weight: bold; text-decoration: none;">{{</ins>fluxscale<ins style="font-weight: bold; text-decoration: none;">}}</ins>'', you may want initially to use only the few hours in the middle of an observation, when the calibrator is at higher elevation.</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>However, at press time <del style="font-weight: bold; text-decoration: none;">[[</del>fluxscale<del style="font-weight: bold; text-decoration: none;">]] </del>does not have a timerange input. The following procedure outlines a way to bootstrap the calibrator flux densities based on observations when the source is at higher elevation.</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>However, at press time <ins style="font-weight: bold; text-decoration: none;">{{</ins>fluxscale<ins style="font-weight: bold; text-decoration: none;">}} </ins>does not have a timerange input. The following procedure outlines a way to bootstrap the calibrator flux densities based on observations when the source is at higher elevation.</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div># Run <del style="font-weight: bold; text-decoration: none;">[[</del>gaincal<del style="font-weight: bold; text-decoration: none;">]] </del>using only the middle few hours to get the solutions at higher elevations.</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div># Run <ins style="font-weight: bold; text-decoration: none;">{{</ins>gaincal<ins style="font-weight: bold; text-decoration: none;">}} </ins>using only the middle few hours to get the solutions at higher elevations.</div></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div># Run <del style="font-weight: bold; text-decoration: none;">[[</del>fluxscale<del style="font-weight: bold; text-decoration: none;">]] </del>to get the calibrator flux using these data only.</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div># Run <ins style="font-weight: bold; text-decoration: none;">{{</ins>fluxscale<ins style="font-weight: bold; text-decoration: none;">}} </ins>to get the calibrator flux using these data only.</div></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div># Run <del style="font-weight: bold; text-decoration: none;">[[</del>setjy<del style="font-weight: bold; text-decoration: none;">]] </del>to enter this calibrator flux manually.</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div># Run <ins style="font-weight: bold; text-decoration: none;">{{</ins>setjy<ins style="font-weight: bold; text-decoration: none;">}} </ins>to enter this calibrator flux manually.</div></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div># Delete the gain table that was output by <del style="font-weight: bold; text-decoration: none;">[[</del>gaincal<del style="font-weight: bold; text-decoration: none;">]]</del>.</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div># Delete the gain table that was output by <ins style="font-weight: bold; text-decoration: none;">{{</ins>gaincal<ins style="font-weight: bold; text-decoration: none;">}}</ins>.</div></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div># Run <del style="font-weight: bold; text-decoration: none;">[[</del>gaincal<del style="font-weight: bold; text-decoration: none;">]] </del>again, using the entire observing run.</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div># Run <ins style="font-weight: bold; text-decoration: none;">{{</ins>gaincal<ins style="font-weight: bold; text-decoration: none;">}} </ins>again, using the entire observing run.</div></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div># Finally, use <del style="font-weight: bold; text-decoration: none;">[[</del>applycal<del style="font-weight: bold; text-decoration: none;">]] </del>to generate the corrected data.</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div># Finally, use <ins style="font-weight: bold; text-decoration: none;">{{</ins>applycal<ins style="font-weight: bold; text-decoration: none;">}} </ins>to generate the corrected data.</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>--[[User:Jgallimo|Jack Gallimore]] 14:39, 30 October 2009 (UTC) (based on an e-mail from Jim Ulvestad)</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>--[[User:Jgallimo|Jack Gallimore]] 14:39, 30 October 2009 (UTC) (based on an e-mail from Jim Ulvestad)</div></td></tr>
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Dk3wc
https://casaguides.nrao.edu/index.php?title=Some_Notes_on_VLA_/_EVLA_gain_curves_and_fluxscale&diff=1994&oldid=prev
Lchomiuk at 17:17, 25 March 2010
2010-03-25T17:17:06Z
<p></p>
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 13:17, 25 March 2010</td>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>[[Category:VLA]][[Category:EVLA]]</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>[[Category:VLA]][[Category:EVLA]]</div></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;"></del></div></td><td colspan="2" class="diff-side-added"></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Some of the EVLA antennas have significant amplitude gain curvature as a function of elevation, owing perhaps to</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Some of the EVLA antennas have significant amplitude gain curvature as a function of elevation, owing perhaps to</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>whatever the attenuation and AGCs are doing (or not). Ideally, to derive the flux density of your secondary calibrators using ''[[fluxscale]]'', you may want initially to use only the few hours in the middle of an observation, when the calibrator is at higher elevation.</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>whatever the attenuation and AGCs are doing (or not). Ideally, to derive the flux density of your secondary calibrators using ''[[fluxscale]]'', you may want initially to use only the few hours in the middle of an observation, when the calibrator is at higher elevation.</div></td></tr>
</table>
Lchomiuk
https://casaguides.nrao.edu/index.php?title=Some_Notes_on_VLA_/_EVLA_gain_curves_and_fluxscale&diff=1564&oldid=prev
Jgallimo at 17:11, 23 February 2010
2010-02-23T17:11:17Z
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 13:11, 23 February 2010</td>
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<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Some of the EVLA antennas have significant amplitude gain curvature as a function of elevation, owing perhaps to</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Some of the EVLA antennas have significant amplitude gain curvature as a function of elevation, owing perhaps to</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>whatever the attenuation and AGCs are doing (or not). Ideally, to derive the flux density of your secondary calibrators using ''[[fluxscale]]'', you may want initially to use only the few hours in the middle of an observation, when the calibrator is at higher elevation.</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>whatever the attenuation and AGCs are doing (or not). Ideally, to derive the flux density of your secondary calibrators using ''[[fluxscale]]'', you may want initially to use only the few hours in the middle of an observation, when the calibrator is at higher elevation.</div></td></tr>
</table>
Jgallimo
https://casaguides.nrao.edu/index.php?title=Some_Notes_on_VLA_/_EVLA_gain_curves_and_fluxscale&diff=410&oldid=prev
Jgallimo at 14:40, 1 December 2009
2009-12-01T14:40:56Z
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 10:40, 1 December 2009</td>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div># Finally, use [[applycal]] to generate the corrected data.</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div># Finally, use [[applycal]] to generate the corrected data.</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>--[[User:Jgallimo|<del style="font-weight: bold; text-decoration: none;">Jgallimo</del>]] 14:39, 30 October 2009 (UTC) (based on an e-mail from Jim Ulvestad)</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>--[[User:Jgallimo|<ins style="font-weight: bold; text-decoration: none;">Jack Gallimore</ins>]] 14:39, 30 October 2009 (UTC) (based on an e-mail from Jim Ulvestad)</div></td></tr>
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Jgallimo
https://casaguides.nrao.edu/index.php?title=Some_Notes_on_VLA_/_EVLA_gain_curves_and_fluxscale&diff=126&oldid=prev
Admin at 20:32, 3 November 2009
2009-11-03T20:32:09Z
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 16:32, 3 November 2009</td>
</tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l1">Line 1:</td>
<td colspan="2" class="diff-lineno">Line 1:</td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Some of the EVLA antennas have significant amplitude gain curvature as a function of elevation, owing perhaps to</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Some of the EVLA antennas have significant amplitude gain curvature as a function of elevation, owing perhaps to</div></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>whatever the attenuation and AGCs are doing (or not). Ideally, to derive the flux density of your secondary calibrators using ''fluxscale'', you may want initially to use only the few hours in the middle of an observation, when the calibrator is at higher elevation.</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>whatever the attenuation and AGCs are doing (or not). Ideally, to derive the flux density of your secondary calibrators using ''<ins style="font-weight: bold; text-decoration: none;">[[</ins>fluxscale<ins style="font-weight: bold; text-decoration: none;">]]</ins>'', you may want initially to use only the few hours in the middle of an observation, when the calibrator is at higher elevation.</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>However, at press time [[fluxscale]] does not have a timerange input. The following procedure outlines a way to bootstrap the calibrator flux densities based on observations when the source is at higher elevation.</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>However, at press time [[fluxscale]] does not have a timerange input. The following procedure outlines a way to bootstrap the calibrator flux densities based on observations when the source is at higher elevation.</div></td></tr>
</table>
Admin
https://casaguides.nrao.edu/index.php?title=Some_Notes_on_VLA_/_EVLA_gain_curves_and_fluxscale&diff=125&oldid=prev
Admin at 20:31, 3 November 2009
2009-11-03T20:31:46Z
<p></p>
<table style="background-color: #fff; color: #202122;" data-mw="interface">
<col class="diff-marker" />
<col class="diff-content" />
<col class="diff-marker" />
<col class="diff-content" />
<tr class="diff-title" lang="en">
<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Older revision</td>
<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 16:31, 3 November 2009</td>
</tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l2">Line 2:</td>
<td colspan="2" class="diff-lineno">Line 2:</td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>whatever the attenuation and AGCs are doing (or not). Ideally, to derive the flux density of your secondary calibrators using ''fluxscale'', you may want initially to use only the few hours in the middle of an observation, when the calibrator is at higher elevation.</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>whatever the attenuation and AGCs are doing (or not). Ideally, to derive the flux density of your secondary calibrators using ''fluxscale'', you may want initially to use only the few hours in the middle of an observation, when the calibrator is at higher elevation.</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>However, at press time fluxscale does not have a timerange input. The following procedure outlines a way to bootstrap the calibrator flux densities based on observations when the source is at higher elevation.</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>However, at press time <ins style="font-weight: bold; text-decoration: none;">[[</ins>fluxscale<ins style="font-weight: bold; text-decoration: none;">]] </ins>does not have a timerange input. The following procedure outlines a way to bootstrap the calibrator flux densities based on observations when the source is at higher elevation.</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div># Run [[gaincal]] using only the middle few hours to get the solutions at higher elevations.</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div># Run [[gaincal]] using only the middle few hours to get the solutions at higher elevations.</div></td></tr>
</table>
Admin
https://casaguides.nrao.edu/index.php?title=Some_Notes_on_VLA_/_EVLA_gain_curves_and_fluxscale&diff=124&oldid=prev
Admin at 20:31, 3 November 2009
2009-11-03T20:31:32Z
<p></p>
<table style="background-color: #fff; color: #202122;" data-mw="interface">
<col class="diff-marker" />
<col class="diff-content" />
<col class="diff-marker" />
<col class="diff-content" />
<tr class="diff-title" lang="en">
<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Older revision</td>
<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 16:31, 3 November 2009</td>
</tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l4">Line 4:</td>
<td colspan="2" class="diff-lineno">Line 4:</td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>However, at press time fluxscale does not have a timerange input. The following procedure outlines a way to bootstrap the calibrator flux densities based on observations when the source is at higher elevation.</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>However, at press time fluxscale does not have a timerange input. The following procedure outlines a way to bootstrap the calibrator flux densities based on observations when the source is at higher elevation.</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div># Run gaincal using only the middle few hours to get the solutions at higher elevations.</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div># Run <ins style="font-weight: bold; text-decoration: none;">[[</ins>gaincal<ins style="font-weight: bold; text-decoration: none;">]] </ins>using only the middle few hours to get the solutions at higher elevations.</div></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div># Run fluxscale to get the calibrator flux using these data only.</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div># Run <ins style="font-weight: bold; text-decoration: none;">[[</ins>fluxscale<ins style="font-weight: bold; text-decoration: none;">]] </ins>to get the calibrator flux using these data only.</div></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div># Run setjy to enter this calibrator flux manually.</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div># Run <ins style="font-weight: bold; text-decoration: none;">[[</ins>setjy<ins style="font-weight: bold; text-decoration: none;">]] </ins>to enter this calibrator flux manually.</div></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div># Delete the gain table that was output by gaincal.</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div># Delete the gain table that was output by <ins style="font-weight: bold; text-decoration: none;">[[</ins>gaincal<ins style="font-weight: bold; text-decoration: none;">]]</ins>.</div></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div># Run gaincal again, using the entire observing run.</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div># Run <ins style="font-weight: bold; text-decoration: none;">[[</ins>gaincal<ins style="font-weight: bold; text-decoration: none;">]] </ins>again, using the entire observing run.</div></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div># Finally, use applycal to generate the corrected data.</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div># Finally, use <ins style="font-weight: bold; text-decoration: none;">[[</ins>applycal<ins style="font-weight: bold; text-decoration: none;">]] </ins>to generate the corrected data.</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>--[[User:Jgallimo|Jgallimo]] 14:39, 30 October 2009 (UTC) (based on an e-mail from Jim Ulvestad)</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>--[[User:Jgallimo|Jgallimo]] 14:39, 30 October 2009 (UTC) (based on an e-mail from Jim Ulvestad)</div></td></tr>
</table>
Admin
https://casaguides.nrao.edu/index.php?title=Some_Notes_on_VLA_/_EVLA_gain_curves_and_fluxscale&diff=59&oldid=prev
Jgallimo at 14:39, 30 October 2009
2009-10-30T14:39:02Z
<p></p>
<table style="background-color: #fff; color: #202122;" data-mw="interface">
<col class="diff-marker" />
<col class="diff-content" />
<col class="diff-marker" />
<col class="diff-content" />
<tr class="diff-title" lang="en">
<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Older revision</td>
<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 10:39, 30 October 2009</td>
</tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l10">Line 10:</td>
<td colspan="2" class="diff-lineno">Line 10:</td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div># Run gaincal again, using the entire observing run.</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div># Run gaincal again, using the entire observing run.</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div># Finally, use applycal to generate the corrected data.</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div># Finally, use applycal to generate the corrected data.</div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">--[[User:Jgallimo|Jgallimo]] 14:39, 30 October 2009 (UTC) (based on an e-mail from Jim Ulvestad)</ins></div></td></tr>
</table>
Jgallimo
https://casaguides.nrao.edu/index.php?title=Some_Notes_on_VLA_/_EVLA_gain_curves_and_fluxscale&diff=8&oldid=prev
Admin: Created page with 'Some of the EVLA antennas have significant amplitude gain curvature as a function of elevation, owing perhaps to whatever the attenuation and AGCs are doing (or not). Ideally, to…'
2009-10-23T19:16:52Z
<p>Created page with 'Some of the EVLA antennas have significant amplitude gain curvature as a function of elevation, owing perhaps to whatever the attenuation and AGCs are doing (or not). Ideally, to…'</p>
<p><b>New page</b></p><div>Some of the EVLA antennas have significant amplitude gain curvature as a function of elevation, owing perhaps to<br />
whatever the attenuation and AGCs are doing (or not). Ideally, to derive the flux density of your secondary calibrators using ''fluxscale'', you may want initially to use only the few hours in the middle of an observation, when the calibrator is at higher elevation.<br />
<br />
However, at press time fluxscale does not have a timerange input. The following procedure outlines a way to bootstrap the calibrator flux densities based on observations when the source is at higher elevation.<br />
<br />
# Run gaincal using only the middle few hours to get the solutions at higher elevations.<br />
# Run fluxscale to get the calibrator flux using these data only.<br />
# Run setjy to enter this calibrator flux manually.<br />
# Delete the gain table that was output by gaincal.<br />
# Run gaincal again, using the entire observing run.<br />
# Finally, use applycal to generate the corrected data.</div>
Admin