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Single Continuum

Setting up a continuum observation is very straightforward as you onlyhave enter the centre (average) frequency in either the rest-frame ofthe source or in the observed (sky) frame - you will usually want thelatter. With this information, the OT will then place 4 2-GHz widespectral windows such that they cover the full 8 GHz of availablebandwidth (per polarization). For bands 3-8 this will result in twospectral windows per sideband and, therefore, a gap in the frequencycoverage. This also means that the requested frequency will notactually be observed! This is why the fact that this is an averagefrequency is emphasised. For bands 9 and 10, the spectral windows arearranged in a single sideband and cover a contigious 8 GHzrange. Therefore, the requested frequency for these bands is observed. We strongly recommend that you view your spectral setup inthe Visual Spectral Editor, to ensure that your continuum bands do notfall in areas of strong atmospheric absorption.


next up previous contents index
Next: Calibration Setup Up: Spectral Setup Previous: Up to 4 spectral   Contents   Index
The ALMA OT Team, 2011 May 20