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- Sideband(s) to prioritise: If set, the algorithm will try to place the requested frequencies in the designated sideband.
- Base band config(s) to prioritise: Weights (0 to 100) allow the basebands to be prioritised. This could be useful as, due to LO2 not having a continuous range, it is not always possible to tune to the exact frequencies requested. The weights are usually left at the defaults of 100.
- Doppler Reference: If the usual route of entering rest frequencies and a source velocity has been followed, this should be set to ``rest''. However, for high-redshift sources where the desired frequencies have been manually corrected to the lsrk frame, the ``lsrk'' option should be selected. This will only correct for Earth motion relative to this frame and ignore the source velocity. Finally, if no correction should be made whatsoever, e.g. for pointing and continuum setups, ``topo'' should be chosen.
- Calculate LOs 1 and 2: After the baseband frequencies and the various priorities have been entered, see below, the ability of the system to find a tuning solution should be checked by clicking this button. It is not actually necessary to do this as the telescope control system will calculate the various LOs itself when the SB is run, but it's a very useful check and should in fact always be done.
- LO1 Frequency: The LO1 frequency as determined in the OT, either by the tool itself, or entered by the user. This is an estimate used to help the user in correlator setup - the actual value used will depend on the time of observation.
- Total Data Rate: Estimate of the total data rate summed over all basebands. This is the output data rate from the correlator i.e. this number together with the total observing time determines how much data ends up in the ASDM and thus the archive.
Next: Basebands
Up: BaseBand Configurations
Previous: Hardware Setup
Contents
The ALMA OT Team, 2017 Dec 18