The file contains: minutes of 4th – 7th meeting held on 11-12/04/1989 (Bologna), 24-25/10/1989 (Strasbourg), 20-21/02/1990 (Macclesfield, Chesire), 03/09/1990 (Prague), (chairman H. C. Kahlmann), agenda, working documents such as reports, notes, members lists, concerning interference problems in radio astronomy, as well as correspondence concerning gravity waves.

Topics discussed include: ESF-CRAF and IUCAF activities; Interference situation in Italy; Reduction of interference in observations with synthesis radio telescopes; Reports on: consideration of frequency sharing between the mobile-satellite service and the radio astronomy service, radio astronomy at WARC MOB-87; WARC on the use of the geostationary-satellite orbit; Results of the final meeting of study group 2 in 1989; Report on availability and demand of the radio frequency spectrum; Memorandum on the protection of frequency bands to allow observations of the earth’s ionosphere and atmosphere with incoherent scatter radars; IAU/URSI symposium radio astronomical Seeing – Beijing (05/1989); Westerbork frequency monitoring system; VLBI (Very long baseline interferometry) and radio interference; GLONASS in August 1990; Perspectives for WARC 92; Recent LOCSTAR developments.

English, French

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