How do I pick the best bandwidth to use? (heterodyne)

Use what you need. i.e. only request wideband mode if your source requires it. Only request multi subband observations if you need it and not to get “free lines” – typically the more complex an ACSIS set up the higher the chance for baseline issues due to less stable power supplies. Choosing two 250 MHz bands with lines in the center of each band is better than choosing a 400 MHz band centered on one line.

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Category: JCMT OT

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