Pulsar Observing

A number of pulsar back-ends are available for user experiments at Arecibo. These consist of a ``facility'' instrument built and maintained by NAIC, the WAPP, while some ``user-owned public-access instruments'' have been made available to the community by their owners. The pulsar backends currently accessible by general users are summarized in Table 6.

Table: Publically Available Pulsar Back-ends at AO

Machine	Max BW	Max Chan	Min Samp	Usage
	(MHz)		($\mu$s)
WAPP$^{a}$	100	1024	25	Search, Timing, Poln, Single Pulse
PSPM	8	128	12	Search,
''	8	128	80	Timing
ABPP	112	32	varies	Timing
''	28	32	varies	Poln
ASP	64	16	-	Poln; 16 $\times$ 4 MHz channels via ABPP
FPDAS	2000	-	0.0005	Single Pulse

Notes:
a) For the WAPP, limits on the combination of number of channels and sampling rate used is set by the output rate of the machine.

Machine	Design	Owner	Remarks
WAPP	Correlator	Facility	Presently being replicated
PSPM	Filter Bank	Wolszczan, Penn State
ABPP	Coherent Dedispersion	Backer, Berkeley
ASP	Coherent Dedispersion	Backer, Berkeley & Stairs, UBC	PC Cluster
FPDAS	Coherent Dedispersion	Hankins, NMT	digital oscilloscope