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View this ticket online: <a href="https://help.nrao.edu/agent/#app.tickets,t:35025" 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:35025</a>
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Xinkai Chen <xkchen.astro@gmail.com> </td>
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• Xinkai Chen <xkchen.astro@gmail.com><br>
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Awaiting User
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Redhat 8
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Hi Xinkai, Indeed, the total bandwidth should not be the 50MHz, the value for continuum, but much smaller. I think I can look it up later in some old textbook/manual/archive but from me...
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<!-- DP_MESSAGE_BEGIN --><div dir="ltr" lang="en" name="dp_message_161076_begin" class="dp_message_161076_begin"><div>Hi Xinkai,</div><div><br></div><div>Indeed, the total bandwidth should not be the 50MHz, the value for continuum, but much smaller. I think I can look it up later in some old textbook/manual/archive but from memory and your screen shot of 48.8 kHz it almost certainly is 3.125 MHz total in the line IF (maybe you can check that in the headers of the other data in this project if you downloaded them - they should use the same setup according to your screen shot). You can hand-edit the number in the header using the verb puthead (and maybe read the explain/help for task gethead too)</div><div><br></div><div>default puthead<br></div><div>getname <catalog#></div><div>keyword 'cdelt3' <--- identifies the increment parameter on the third axis (ie the frequency axis)<br></div><div>keyvalue 3.125e6/64, 0 <--- divide the 3.125 MHz total bandwidth in 64 channels (~48.8 kHz)<br></div><div>puthead <--- changes the header value<br></div><div>imhead <--- check that it has the number you wanted<br></div><div><br></div><div>You should also see if that changes the value in the FQ table (probably not), which probably also should be changed using the verb tabput</div><div>default tabput</div><div>getname <catalog#></div><div>inext 'fq' <--- edit the FQ table</div><div>docrt 1;go prtab <--- to print what the table says<br></div><div>pixxy 1,3 <--- identifies the third column (CH WIDTH) on row one - it may say 3125000 for the total bandwidth in column 4, actually, to use above in puthead<br></div><div>keyvalue 3.125e6/64, 0 <--- divide the 3.125 MHz total bandwidth in 64 channels (~48.8 kHz)<br></div><div>tabput <--- changes the table value<br></div><div>go prtab <--- check that it has the number you wanted</div><div><br></div><div>if it doesn't show 3125000 in column 4 you may want to change that using pixx 1,4 and keyvalue 3.125e6,0<br></div><div><br></div><div>Good luck<br></div><div><br></div>
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<div>Lorant Sjouwerman (he, etc)<br></div>
<div>NRAO Science User Support<br></div></div><!-- DP_MESSAGE_END -->
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