2. Build-Up of Long Range Cor.unications a. Communiwtion planning conferences in January and April r of 1955 resulted in decisions to provide expanded long-range joint facilities for REDWING, An outstanding feature of the plan was the construction of a receiver station on JAPTAN Island, to include all I-IF receiving equipment formerly operated byAACS at building 89 and by TG 7.2 at building 85. It was thought that this location would . provide noise and interference-freereception, by virture of its isolatiGn from transmitters and sources of electrical noise. Also, adequate space for efficient antenna systems was available. This move would make available an area on ENIWETOK Island, i.e., the old TG . 7.2 receiver station and antenna field, which was needed for other construction, Holmes &Narver began construction of the new receiver station and amp facilities on JAPTAN Island \ in &y 1955, almost one year before tho start of Operation REDWING. b. An additional featue of the JAPTAN station construction plan was the inclusion of a LORAN monitoring receiver stition. This was intended to eliminate the possibility of serious interference to the LORAN system caused by HF transmitters on ENIWETOK Island, as was experienced during CASTLE. Strong local signals in the 2 megacycle region had been found to interfere with the IQRAN stition by preven~ ing the observation of the synchronism of its slave stations, which is essential to proper operation. A remote monitoring installation would avoid this difficulty and permit the use of frequencies in the 2 negacycle range for communications. 70