CHAPTER Jl, SECTION 3 STATIONS: J-3231.01 through .08 SITE: Johnston Island USER: sc PURPOSE: Rocket Launcher Pads PARTICIPATION: J-40, J-41 DESIGN PSI: None CONSTRUCTION: 5-3-58, 6-20-58 Each of these stabilized launching areas were 20 feet in diameter. In the center of each area a 6-foot-square concrete pad was placed with a survey monument. An additional survey monument was placed 60 feet in front of the pad. + - 4 < ie , # ‘ . The screened room was 15x20x8-foot-high with a trussed rafter roof that was sheathed. Copper screen was fastened to the lower chords, and the walls were exposed studs covered on the inside with copper screening. The structure was skid-mounted with no floor and was grounded to rods at two corners. STATIONS: J-3240.01 through .03 SITE: Sand Island (Johnston USER: SC PURPOSE: Midot Station Island) PARTICIPATION: J-40, J-41 DESIGN PSI: None CONSTRUCTION: 5-26-58/7-7-58 Stations J-3240.01 on Johnston Island and .02 on Sand Island each consisted of a cleared level area 450 feet square with antenna support . * ~ No power was supplied to these pads but a screened shelter was provided on the west end of the island where Stations J-3231.01 and .02 were located apart from the other launcherpads. i . L - - tee al (Neg. No. W-915-7) Figure No. 2-73. Midot Station J-3240.01. existed, none large enough to suitably site the facility. Consequently, Station 3240.03 was cancelled. STATION: J-3241.01 SITE: Johnston Island USER: SC PURPOSE: Telemetry PARTICIPATION: J-40, J-41 DESIGN PSI: None CONSTRUCTION: 4-14-58/7-7-58 This station occupied the same space as Stations J-3230.01 and J-3440.01 in Building T-249. Details of the modification are discusse: under Station J-3230.01. In addition, two 5% foot-square by 15-inch-thick pads were placea on the roof over the station room below. These pads contained adjustable antenna support base poles. Each station had nine 8-inch-diameter steel poles about 2 feet high. Four poles were STATIONS: J-3260.01 through .06 SITE: Johnston Island poles were located on the same lines but 139 feet USER: SC PURPOSE: each pole to the center, and a protective barrier fence was provided along the cable runs for Station J-3240.02 only. Launching Pad for Instrument Rockets PARTICIPATION: J-40, J-41 located 90° apart, 209 feet from the center, four from the center, and one pole was located at the center. User-furnished cable was placed from Station J-3240.03 was designed to be placed in the reef area east of Johnston Island with a similar installation. However, since the area was presumed to be in shallow water, the poles were higher and the User-furnished instrument trailer was to be placed on a sunken barge to be located near the center of the antenna area. Field investigation of the reef area indicated the construction was not feasible, since only isolated coral heads Page 136 DESIGN PSI: None CONSTRUCTION: 5-19-58/6-9-58 Each of these 70-foot-diameter stabilized areas contained a working area 36 feet in diameter. Six concrete survey monuments w. e placed within a fenced area, 18x36 feet, loca 1 at one end of the outer stabilized area. An adaitional monument was placed 25 feet out from the opposite side of the larger area.