— ae Le Project 6.4 - Determination of Characteristics of Airborne Flush Mounted Antennas and Photo Tubes for Yield Determination at Extended Ground-to-Air Ranges - Allan J. Waters OBJECTIVES To determine the effectiveness of flush mounted airborne antennas and phototubes at various ground-to-air ranges in detecting characteristic low frequency electromagnetic radiation and visible radiation, respectively. To determine the temporal and amplitude characteristics of the low frequency electromagnetic radiation at various ground-to-air ranges. To determine the temporal and intensity characteristics of visible} radiation at various ground-to-air ranges. To determine the effects of ambient conditions upon the satisfactory measurement of the parameters specified in items 1 and 2 above, INSTRUM™NTAT ION 2 fiducial antennas 2 scope cameras 1 whip antenna 1 sequence camera 1 synchronizer 1 recorder 2 photoheads 2 Dumont Scopes (1 a dual beam, 1 a single beam) TECHNIQUE Signal is received by antenna fed through an amplifier and then to the scope. The signal is then photographed, directly to the recorder. Photohead output is let The sequence camera photographs the blast directly for use in correlation of previous data. imately 92 miles, Distance was approx-