Документ взят из кэша поисковой машины. Адрес
оригинального документа
: http://www.atnf.csiro.au/vlbi/wiki/index.php?n=LBAFeb2009.V255D
Дата изменения: Unknown Дата индексирования: Tue Apr 12 14:53:45 2016 Кодировка: |
V255Dv255d Setup v255d.5cm-icrf:
v255d Setup v255d.5cm:
Ftp: ftp://ftp.atnf.csiro.au/pub/people/vlbi/v255/v255d Comments:Observing comments for each antenna:Background:The purpose of these observations is to obtain the second epoch for proper motion/parallax observations of the methanol maser sources NGC6334F and NGC6334I(N) (first epoch was v255c in Nov08). We are using the same observing mode as for previous v255 experiments (although the maser band frequency has shifted upwards by 2 MHz compared to the Nov 2008 session). We will observe both masers and phase calibrators with dual polarization 2x16 MHz bandpasses, but the correlator output will be high spectral resolution around the masers (NGC6334F should show a strong peak at a sky frequency of around 6669.56 MHz during these observations) and standard continuum for the phase reference source. The idea is to have a mode which expands the number of suitable phase reference sources available for spectral line sources. Specifics:The experiment has 4 distinct sections, minor setup changes are required between 13:00:00 and 13:20:00 then at 14:35:20 and 00:03:30 UT
During the ICRF runs we have sometimes had to exclude certain antennas (particularly Parkes) from observations of some sources in order to get a good spread of azimuths and elevations. Observing comments for each antenna:Hobart, Ceduna :The 4 x 16 MHz bandpass setup will require feeding two separate LOs into IFP#1 and #2 on the DAS/frequency translator and splitting the LCP signal so that is feed into both sides. For Hobart the LOs should be set to 468 MHz (IFP#1) and 810 MHz (IFP#2) for the 4 x 16 MHz setup and 810 MHz for the 2 x 16 MHz setup. For Ceduna, if you set the agilent to 11.1 GHz rather than 11.4 GHz, then you can use the same LOs as at Hobart. Parkes, ATCA, Mopra :Cable up with the Huygens cable for the entire experiment. Observe with dual DAS setup using 2 DASes for the 4 x 16 MHz setups and 1 for the dual polarization 2 x 16 MHz setup. Record using the following cdisko channel selections at the appropriate time ranges. Stop the recorder in between! At Parkes you will have to change the frequency manually running for example (in a pavo xterm)
ATCA will have to cacal at 6.3/6.7 GHz and 6.7/6.7 GHz before the experiment. Note "catie" should be setup for Rcp/Lcp (Lcp is selected in cdisko) DAS calibrationDuring the first 20 minutes we will need to calibrate the delay between the two ATNF DAS, and the delay between Hobart/Ceduna in dual pol and single pol mode. The following modes will need to be used to calibrate these. ATNF DAS offsets:Everyone records with a dual polarisation/6.7 GHz setup. ATNF records at 512 Mbps, ie Huygens/Channel 1-8 in cdisko with DAS1 and DAS2 Hobart/Ceduna Single pol calibrationHobart and Ceduna cable up with LCP into both IFP, but remain at 6.7 GHz. Pks/ATCA/Mop record chans 1-4. Split freq fringe testHobart and Ceduna retune IFP#1 to 6316 MHz. Parkes/Mopra/ATCA run with DAS#1 centered at 6316 and DAS#2 at 6658 MHz and record Chan 3,4,7,8 in cdisko. Parkes will have to
Observing LogsParkes onsource flagging |