265 am Project €,4 - Determination of Characteristics of Airborne Flush Mounted Antennas and Photo Tubes for Yield Determination at Extended Ground~to~Air Ranges - A. J. Waters OBJECTIVES To determine the effectiveness of flush mounted airberne antennas and phototubes at various ground-to-alr ranges in detecting characteristi: 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 characteristios of visible 2 radiation at various ground-to-air ranges, To determine the effecta of ambient conditions upon the satisfactory measuremert of the parameters specified in the first two items, INSTRUMENTATION 2 fiducial antennas 2 scope cameras 1 synchronizer 1 sequence camera 2 photoheads 1 recorder 2 DuMont Scopes (1 a dual beam, 1 a sirgle 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, Photchead output is led The sequence oamera photographs the blast directly for use in correlation of previous data. Distance was approximately 434 miles, SNL