Hardware (for L-band):

The lower frequency segment of the broad-band Gregorian L-band receiver is plagued by the presence of 7 radars of various origins. Careful measurement of the characteristics of all of these radars have been made. This information is being used for building a radar blanker, which is presently being designed (Bob Zimmermann and Jochen Meier). The RFI group has also worked closely with the Astronomy and Electronics Departments to specify the filters needed for different observations within this band.

Software:

An internal mini-workshop was held in May 1996, with the additional participation of Riccardo Giovanelli from Cornell University. Both on-line and off-line RFI-excision techniques were discussed in respect of Aeronomy and Astronomy observations. These topics were further discussed in the Workshop on "HI Spectroscopy with the Gregorian Feed", held at Arecibo in October 1996. The need for fast data dumping was established, and several excision procedures were considered.