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D4 Discussion 4: Current observing issues at ParkesG. HobbsTopicsThe purpose of this discussion is to identify and, if possible, fix some of the current observing issues at Parkes. The PPTA project currently uses the prototype digital filterbank system (PDFB1) and CPSR2 (sometimes the WBC). Early next year we should be using the new digital filterbank (PDFB2). This system will provide the possibilities of a folded-data mode, search mode and output baseband data for coherent dedispersion. Later in the year we expect that the new coherent dedispersion system APSR will come on line. The receiver systems mainly used to date are the 20cm multibeam receiver and the 10/50 dual-band system. The 20cm multibeam is currently being refurbished and will not be available until May 2007. The HOH receiver will be used instead. The 50cm band is seriously affected by digital TV transmissions. Consideration is being given to an RFI mitigation system that will work in conjunction with the PDFB2 and to changing the receiver (to observe in a cleaner band). The observing techniques etc. have been documented by John Sarkissian. The pulsars have been given a ranking to allow the observer to choose between two pulsars (at 20cm). However, it has been noted that such a ranking does not exist for observations using the 10/50cm receiver. The data are stored on disk at Parkes and the DFB/WBC data pre-processed by John Sarkissian. The CPSR2 are pre-processed by the Swinburne group. Scripts now exist that copy the data to Epping. John S. is providing an email report at the end of each observing session. At Epping the data are processed using automatic scripts that produce scrunched archives and timing residuals. Topics for discussion include:
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