next up previous contents index
Next: Spectral Windows Up: Instrument Setup Previous: BaseBand Configurations   Contents   Index

Baseband Specifications

Below the baseband summary table and the LO Setup Preferences panels are tabs containing the details of each of the basebands. Initially, no baseband configuration is available and at least one baseband configuration should be defined. To create a baseband configuration, hit the Add BaseBand button. The first baseband (with index 1) will become visible. Most fields will be zero or have default values.

As already mentioned, some of these parameters depend on previous settings, e.g. on the receiver bands and on other settings in the upper panels of the form.

In the Products & Sideband Separation field you can specify the combination of correlation products and the sideband separation mode. Only allowed combinations are listed, this depending on the receiver type and the choice of Accumulation Mode . When ALMA_FAST is selected for the accumulation mode, AUTO_ONLY & NONE is the only choice. Otherwise, i.e. when ALMA_NORMAL is selected, one or more choices are listed depending on the receiver type. FREQUENCY_OFFSET_REJECTION is the only allowed choice if the receiver type is SSB (Band 1 and 2) or 2SB (Band 3-8). Note that PHASE_SWITCHING_REJECTION is not listed: it is notsupposed to be used although ALMA has the function. For the DSB (Band 9 and 10) receiver type, the modes of separation are PHASE_SWITCHING_SEPARATION and FREQUENCY_OFFSET_SEPARATION as well as FREQUENCY_OFFSET_REJECTION .
The option FREQUENCY_OFFSET_SEPARATION is not available for the ACA correlator.


next up previous contents index
Next: Spectral Windows Up: Instrument Setup Previous: BaseBand Configurations   Contents   Index
The ALMA OT Team, 2011 May 20