AO Home AO Astronomy Schedule Receivers CIMA AO IDL . This page describes the backends available for passive radio astronomy observations. ... PUPPI The Puerto Rico Ultimate Pulsar Processing Instrument, for single-pixel pulsar observations. The Mock Spectrometers for spectral line and pulsar observing using the full 300 MHz bandwidth of ALFA and . single-pixel observing with 7 164 MHz boards or 14 boards with a bandwidth of 82 MHz or less in 7 independently steerable groups. ...