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We present the results of commissioning observations for a new digitalbeamforming back end for the Focal plane L-band Array for the Robert C. ByrdGreen Bank Telescope (FLAG), a cryogenically cooled Phased Array Feed (PAF)with the lowest measured T_sys/eta of any PAF outfitted on a radio telescope todate. We describe the custom software used to apply beamforming weights to theraw element covariances to create research quality spectral line images for thenew fine-channel mode, study the stability of the beam weights over time,characterize FLAG's sensitivity over a frequency range of 150 MHz, and comparethe measured noise properties and observed distribution of neutral hydrogenemission from several extragalactic and Galactic sources with data obtainedwith the current single-pixel L-band receiver. These commissioning runsestablish FLAG as the preeminent PAF receiver currently available for spectralline observations on the world's major radio telescopes.

Commissioning the HI Observing Mode of the Beamformer for the Cryogenically Cooled Focal L-band Array for the GBT (FLAG)