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Daewon Kim <dwkim@mpifr-bonn.mpg.de> </td>
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Awaiting Agent
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Good day, I have a simple question about GMVA data calibration with different IFs/bandwidths. GMVA 2021A session has different IF/bandwidth settings between EU-antennas and VLBA-antenna...
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<div>Good day,</div><div><br></div><div>I have a simple question about GMVA data calibration with different IFs/bandwidths.</div><div>GMVA 2021A session has different IF/bandwidth settings between EU-antennas and VLBA-antennas.</div><div>For example, ANTAB files of the Effelsberg (EF) and BR antennas show the following information.</div><div><br></div><div>***VLBA - BR***</div><div>! ----- Tsys information for BR -----</div><div>TSYS BR timeoff = 0.0 FT = 1.0 /</div><div>!</div><div>! BR C211C 3C345/0 116-08:00:01/116-08:07:01</div><div>! 1 3mm B RCP 1 U 512.00MHz 128M 86076.00MHz 8.69</div><div>! 2 3mm D LCP 2 U 512.00MHz 128M 86076.00MHz 12.18</div><div>! 3 3mm B RCP 3 U 640.00MHz 128M 86204.00MHz 8.23</div><div>! 4 3mm D LCP 4 U 640.00MHz 128M 86204.00MHz 11.65</div><div>! 5 3mm B RCP 5 U 768.00MHz 128M 86332.00MHz 7.90</div><div>! 6 3mm D LCP 6 U 768.00MHz 128M 86332.00MHz 11.07</div><div>! 7 3mm B RCP 7 U 896.00MHz 128M 86460.00MHz 7.88</div><div>! 8 3mm D LCP 8 U 896.00MHz 128M 86460.00MHz 10.83</div><div>116 08:00.275 99.44 999.00 99.36 999.00 101.28 999.00 103.23 999.00 ! 63.19</div><div>116 08:00.767 99.44 155.10 99.48 142.58 101.31 131.39 103.29 135.48 ! 63.28</div><div>116 08:01.267 99.40 155.17 99.48 142.59 101.28 131.36 103.36 135.32 ! 63.36</div><div>116 08:01.767 99.48 155.14 99.45 142.49 101.40 131.23 103.38 135.26 ! 63.44</div><div>116 08:02.267 99.39 155.09 99.42 142.36 101.26 131.16 103.19 135.37 ! 63.53</div><div>.</div><div>.</div><div><br></div><div>***EU - Effelsberg***</div><div>! ----- Tsys information for EFLSBERG </div><div>TSYS EF FT = 1.0 TIMEOFF=0 </div><div>INDEX= 'R1','R2','R3','R4','R5','R6','R7','R8','L1','L2','L3','L4','L5','L6','L7','L8'</div><div>/</div><div>!Column 1 = R1: bbc01, 86044.00 MHz , LSB, BW= 64.00 MHz, Tcal=14.50 K</div><div>!Column 2 = R2: bbc01, 86108.00 MHz , USB, BW= 64.00 MHz, Tcal=14.50 K</div><div>!Column 3 = R3: bbc02, 86172.00 MHz , LSB, BW= 64.00 MHz, Tcal=14.50 K</div><div>!Column 4 = R4: bbc02, 86236.00 MHz , USB, BW= 64.00 MHz, Tcal=14.50 K</div><div>!Column 5 = R5: bbc03, 86300.00 MHz , LSB, BW= 64.00 MHz, Tcal=14.50 K</div><div>!Column 6 = R6: bbc03, 86364.00 MHz , USB, BW= 64.00 MHz, Tcal=14.50 K</div><div>!Column 7 = R7: bbc04, 86428.00 MHz , LSB, BW= 64.00 MHz, Tcal=14.50 K</div><div>!Column 8 = R8: bbc04, 86492.00 MHz , USB, BW= 64.00 MHz, Tcal=14.50 K</div><div>!Column 9 = L1: bbc05, 86044.00 MHz , LSB, BW= 64.00 MHz, Tcal=13.40 K</div><div>!Column 10 = L2: bbc05, 86108.00 MHz , USB, BW= 64.00 MHz, Tcal=13.40 K</div><div>!Column 11 = L3: bbc06, 86172.00 MHz , LSB, BW= 64.00 MHz, Tcal=13.40 K</div><div>!Column 12 = L4: bbc06, 86236.00 MHz , USB, BW= 64.00 MHz, Tcal=13.40 K</div><div>!Column 13 = L5: bbc07, 86300.00 MHz , LSB, BW= 64.00 MHz, Tcal=13.40 K</div><div>!Column 14 = L6: bbc07, 86364.00 MHz , USB, BW= 64.00 MHz, Tcal=13.40 K</div><div>!Column 15 = L7: bbc08, 86428.00 MHz , LSB, BW= 64.00 MHz, Tcal=13.40 K</div><div>!Column 16 = L8: bbc08, 86492.00 MHz , USB, BW= 64.00 MHz, Tcal=13.40 K</div><div>116 01:03.00 256.9 269.7 265.9 268.7 263.5 268.2 261.5 262.5 273.5 284.1 290.6 299.1 293.6 292.5 289.8 298.9 </div><div>116 01:03.33 175.9 182.5 180.2 181.7 181.9 182.3 179.0 180.6 187.5 191.4 194.1 201.4 200.8 201.4 199.2 204.1 </div><div>116 01:03.67 176.0 182.5 180.2 181.9 182.4 182.4 179.1 180.5 186.7 191.5 194.2 201.5 201.4 201.2 198.7 203.7 </div><div>116 01:04.00 176.9 182.0 180.4 181.7 182.2 182.8 179.3 180.7 187.1 192.5 193.9 201.5 201.8 200.7 198.7 203.6 </div><div>116 01:04.33 176.5 182.4 179.9 181.7 182.2 182.7 178.9 180.9 186.7 191.0 193.9 201.8 201.7 200.1 198.6 203.3</div><div>.</div><div>.</div><div><br></div><div>Here it seems that BR has 4 IFs with a bandwidth of 128 MHz for each IF, whereas EF has 8 IFs with a bandwidth of 64 MHz for each IF. So, I was wondering how AIPS (and CASA too) handle this difference between VLBA and EU antennas. Interestingly, if I do the calibration of this GMVA dataset with AIPS, it works anyway with the following frequency setting.</div><div><br></div><div>***Setting shown by the task LISTR***</div><div>Frequency Table summary uses reference channel 0.52</div><div>FQID IF# Freq(GHz) BW(kHz) Ch.Sep(kHz) Sideband Bandcode</div><div> 1 1 86.01200000 64000.0039 500.0000 1</div><div> 2 86.07600000 64000.0039 500.0000 1</div><div> 3 86.14000000 64000.0039 500.0000 1</div><div> 4 86.20400000 64000.0039 500.0000 1</div><div> 5 86.26800000 64000.0039 500.0000 1</div><div> 6 86.33200000 64000.0039 500.0000 1</div><div> 7 86.39600000 64000.0039 500.0000 1</div><div> 8 86.46000000 64000.0039 500.0000 1</div><div><br></div><div>It seems to me that AIPS handles this difference automatically at the FITLD stage (AIPS task, at the very beginning), by dividing each of the VLBA 4 IFs into two sub-IFs thus leading to total 8 IFs: e.g., the first 128MHz-IF of BR --> two 64MHz-IFs to match the first two 64MHz-IFs of EF.</div><div><br></div><div>So, to be sure at this, my questions are: </div><div>1) Am I understanding correcly? (i.e., the above explanation)</div><div>2) How AIPS recognize such data situation (because I did not set any relevant parameters in the FITLD)</div><div>3) Does CASA also has such an automatic function? (e.g., maybe with a task importfitsidi?)</div><div><br></div><div>Thanks!</div><div><br></div><div>Best regards,</div><div>Daewon</div><div><br></div><div><br></div>
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