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: http://www.naic.edu/~astro/guide/node8.html
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The WAPP (for ``Wideband Arecibo Pulsar Processor'' as it first
reached astronomers as a pulsar processor, with standard spectral-line
operation appearing later), is the replacement for the ``interim''
correlator. The WAPP provides eight sub-correlators,
each of these sub-correlators having sixteen 1024-lag chips.
Each of 4 pairs of sub-correlators
can be set up with their own independent bandwidths
and configurations. Table 5 specifies the available
configurations. The maximum bandwidth per sub-correlator is 100 MHz,
with 9 other alternative bandwidths being available in decreasing
octave steps. The WAPP offers both 3- and 9-level operation, both for
standard autocorrelation (total-power) and auto+cross correlation (all
four Stokes parameters) modes. The WAPP also offers a direct-sampling
option. Details of the many WAPP capabilities are to be found at
http://www.naic.edu/alfa/gen_info/wapp_fact_sheet.shtml, with
the WAPP 8-board mode
being described at http://www.naic.edu/~cima/cima_dual_board.html.
Table:
WAPP spectral-line configurations with all 4 digital filter boards
