For spectral-line observing, the original post-upgrade ``interim'' correlation spectrometer provides four independent sub-correlators, each having eight chips with 1024 lags per chip. Each sub-correlator can be set up with its own independent bandwidth and configuration. Table 4 specifies the available configurations. The maximum bandwidth per sub-correlator is 50 MHz, with 8 other alternative bandwidths being available in decreasing octave steps. Popular configurations combine chips in groups of four to provide 9-level sampling (96% efficiency), interleaved operation (50-MHz bandwidth) or auto+cross correlation (i.e. all four Stokes parameters).
|Config||Max Bw||Pol/Sbc||Boards||Lags/Sbc & Resn -|
|per Sbc (MHz)||Used||(kms
|3-level interleaved||50||1||4||4096 (2.6)|
|3-level interleaved||50||2||4||2048 (5.2)|
|3-level Stokes||25||Full Stokes||4||2048 (2.6)|
Robert Minchin 2017-10-30