of 80 megacycles for the same purposes. This was discouraged because of possible ~tual interferencewith the AN/TRC-l radio telephone equipment. It was decided in the end that a band of 156 to 180 megacycles would be satisfactorywith the understandingthat a concentrationwould be effected in the high end of the band to avoid possible interferencewith the 100 to 154 aircraft VHF band. No considerationwas given to possible ~terference from the Mark III IFF equipment operat~ throughout the range of 157 to W megacycles. on 16 December 1947 ~. Ha*mann requested two (2) SCR-300 nets termed ‘Blast Nets” to aid in the tista~ation and test= of his blast measuring equipment. One net was to have eight (8) SCR-300ts and the other, thirteen (~). The request for a Voice Time Signal Broadcast was received fromDr. Froman on 1 November 1947. The Pqose of this broadcast was to inform all land stations, ships and aircraft of the ~ct time of the test. The original plan was to transmit the signals from the AGC-7 after they had been relayed from the Control Station on Parry Island over the radio telephone system. This was later changed to a direct bnadcast frcm the Control Station for reliability considerations. The J-3 (Operations)section of the staff decided on 15 Janua~ 1%8 that AVR air-sea rescue boats would be employed to evacuate the final personnel fran the Zero Island before each shot. 45 ● Section XI .