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CORRELATOR BOARDS

There are four independent correlator boards available in the correlator spectrometer. Each board can be assigned any available bandwidth, center frequency, sampling level, polarization, and number of channels. Note though that, for purposes of Doppler correction, the boards can only be configured to work as four independent boards or as one joined system. That is, two boards cannot be overlapped and centered on one frequency while the other two are set to another frequency (Figure 2).

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Figure 2: The top two images show the possible configurations of the correlator boards - acting as four independent boards and acting together, while the bottom panel exemplifies an observing strategy not allowed with the current system.  

The options are detailed below:

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Table 3: Possible Correlator Configurations 

options, then, are: 4096 (only with one pol. & 3-level sampling), 2048 (available for the 3-level A & B set-up or the 9-level sampling with only one polarization), 1024 (available for all set-ups), 512, 256, 128, 64, 32, or 16 channels. The smaller the number of channels used, the smaller (in size) you data file will be.


next up previous contents
Next: INTEGRATION TIME (per Data Up: Spectral-Line Observing at AO Previous: Calibration Scans

koneil@naic.edu