aid ate. tattle 70 Stati@n 73.05 Station 74.. Enyu Chieerete Station 75.01 Station 75.02 «s » Afrukiiji Yurochi Bikini Station 76 . Aomoen The control and distribution stations used in the Eniwetok area included: Station 71 Station 71.01 Station 72.02 | Parry Engebi Rojoa Station 73.04 Station 73.08 Station 77 - Bogon Rujoru Runit In addition to the stations listed above, a remote control station was maintained aboard the USS Curtiss. Preliminary dry runs in the Eniwetok area commenced on April 19, 1956. Preliminary dry runs started in the Bikini area on May 2, Dry runs and tests were continued in both the Eniwetok and Bikini areas throughout the test series. A World Time rack identical to that used on Operations Castle and Teapot was included in the design of the timing system to record actual zero time with respect to WWVH. This measurement was obtained through use of a 1000-cycle oscillator driving the World Time clock synchronized to WWVHand located in the control room. Theinitial flash of the detonation triggered a Fiducial Marker on the roof of the CP. This, in turn, . triggered a flash tube which produced a photographic record of the clock face at zero time, and was accomplished by checking the clock reading with the precise signals received from WWVH. In addition to engineering assistants, a full-time technician was assigned in each atoll to TU-6, the Firing Party. Telemetering equipment was installed as a part of the timing system. Its purpose was to monitor vital information from the zerosite in addition to various operations of the timing system. Magnetic tape recording and playback equipment provided prerecorded audio voice-time announcements synchronized to the timing system. The recorder was automatically started with the ~15 min signal, and continued to give time hacks down through zero time. The voice count-down was originated at the control station and further distributed to various ships and stations about the atoll through the use of radio links. A radio link was used to transmit tone signals from the USS Curtiss to the master control station, Enyu. These signals were used in remotely controlling the master timing station. ~ In order to provide timing signals to users at locations which were inaccessible to the hard-wire timing system, a radio timing signal system was provided. This system was synchronized to the master timing system and transmitted various tone frequencies to radio receivers, which in turn activated equipment at the user’s station. - 146 - =e /43

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