P munication network between principal points ashore and SCR-608 (10-channel voice) radio sets for voice communi~tions between ships, and between ships and shore. Navy MBF radio sets were to be installed in the cabins of the test and scientific direc~rs and the key command and staff officers of the Joint Task Force to provide an intercommunication system for exclusive use. On 28 October 1947, first consideration was given to the possibility of installing AN,’TRC-1 equipment on the main ships to provide VHF radio telephone and teletype service between the ships and between the ships and the Arm y Shore system. This installation would permit an individual at any ship’s service telephone to call his ship’s switchboard and be connected to any ship’s service telephone on the other ships or to any telephone at the main shore locations. The need for such a flexible radio telephone system interconnecting the U.S.S. Albemarle (AV-5), U.S.S. Curtiss (AV4), U.S.S. Mt. McKinley (AGC-7), Eniwetok Island, Control Island (Parry), and the three Zero Islands (Engebi, Aomon/Biijiri/ Rojoa and Runit ) was discussed with all the principal key personnel concerned. It was agreed that these radio telephone circuits would be a highly desirable feature in the communications system. The radio telephone plan that was finally evolved included the following circuits: AGG7 and AV-5, 2 channels; AGG and AV-4, 1 channel; AV-4 and AV-5, 2 channels; AGG7 and Eniwetok, 7 channels; Eniwetok and Engebi, 8 channels; Eniwetok and Aomon, 4 channels; Eniwetok and Runit, 4 channels; Eniwetok and Parry, 8 channels. All the equipment for this system was to operate within a radius of approximately ten (10) miles and considerable time was devotediby the Communications Section to the selection of the tit y-two (52) frequencies required in the band of 70-100 megacycles. Final requirements for a land-line telephone system were laid down at a conference held on 16 December 1947. These requirements were plotted on maps of the planned island installations and included: a. Eniwetok (1) Radio Chemistry; (2) Security; (3) Others. b. Parry (1) Control Station (3) ; (2) Telemetering Tower (LAJ-8 installation); (3) Beach; (4) Cable Terminal; (5) Communications Building and Guard. c. Each Zero Island (1) Top of Tower (2); (2) Tower Base; , (3) Timing Station (4) ; (4) 400-ft. Station; (5) 1000-ft. Station; (6) Gamma “A”; (7) Gamma “B”; (8) Gamma “C” (Runit only); 103