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Single Continuum
This allows a maximum-bandwidth setup to be defined using only a single receiver band or frequency. Upon choosing a band, the OT will automatically set the spectral window frequencies to recommended defaults. If full polarization has been selected, these have to be used. Otherwise, it is possible to change the spectral windows by moving the position of the average frequency of the setup. For a two sideband receiver the requested frequency actually lies in the gap between the two sidebands. A low-resolution correlator mode (TDM) is chosen for each spectral window.
- Receiver band: Only bands 3, 6 and 7 are available if full polarization has been selected.
- Sky Frequency: Enter a frequency in the observed (sky) frame. This is only possible if full polarization has not been selected. It is possible to reset to the band default frequencies using the button provided.
- Rest Frequency: The rest frequency corresponding to the sky frequency is displayed for reference only. It corresponds to the first source defined in the Field Setup node.
The value of the Representative Frequency is displayed below the table of spectral windows. Its value will default to the centre of the chosen spectral window, but can be changed to another frequency within that spectral window if the transition of greatest interest is not at the centre.
Figure 5.7:
The Single Continuum panel in the Science Goals Spectral Setup.
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The ALMA OT Team, 2014 May 21