UNCLASSIFIED a= .DQUARTERS T..SK GROUP 7.6 JOINT TSK FORCE SEVEN 0 TASK GROUP OPERATION I. a PL =4 Cornuntcations for Task Group 7.6 will bo as prescribed in ANNEX F to F.0. No. 1, Headquartors JTF-7, datod 14 Novonber 1947 and in accerdance with USF 70(B) corrocted through Change No, 2. II. Gonera}Instructions A. 5B. Cc. Radle silenco rust be maintained as ordered by highcr authority. Radio communication within this group will bo largoly by voice radio circuits. It is thereforo incumbent thit a hich dogroe of circuit discipline bo oxcercised by Net Control Stitions to insure orderly and rapid transmission. All oporntiang personnel will be instructed in circuit discipline and cerroct transmission procedure, Encrgency warnings nay criginato on one or nore of the following froequcncios: 3, 4.475, 34.8, 65.74, or 140.58 negacycles. Connindors will insure thnt omergency warnings are rolayed 1s necessary to those fer whom they aro res= pensiblo. Anyone wishing to clear tho circuit for enorgency warnings will say "Urgent, Urgent, Urgent" and then give the mossnge. Whon those words «ro heard, all oxisting traffic will conse cn this circuit, giving the criginater 1 clenr circuit. Likewise, if an pinane is going te crash, the pilct or an observer seoing the plane crash will send 1 "Crash, Cresh, Crash" followed by a message giving the icention of tho crash. Such erash messages should be sent on 4,475 Me. (Voice) or 140.58 Me. (Voice) to tho Air-Se1r Rescue Unit. Dd. BE. Radio silence, when inposed, will net be broken except on ordor cf tho Trask Greyp Conmandor transnitted through Net Control Stations, except in an emergency. Breaking of radio silence duc to an emergency will net authorize a gonornl brenking cof rrdio silence. Stations not involved in the omergency transmission will maintain silenco and listen only. All radio transnitters will be calibreted by 15 March 1948 in accordance with procedures outlined in articles 944 and 945 of USF 70(B). F. G. Only messages ossential to the operation will be transmitted. Net Control Stitions will superviso nets to provont unnecossary transmissions. ail operators will “listen through” to make certain the circuit is cloawr before boginning transnission. TT. RadSafe Radic Noperting Not. The RadSafo Radio Reporting Net will be established on a dato and time to be announced Inter at the direction of CJTF-7. See Trib 1 to this Annex for chinnel numbers, froquenctes and Olreuit descriptions of the RadSafo Radio Noporting Net. Sce niso Tab 2 of this Annex for circuit diagram of the net. Iv, Yoice Radio Call Signs. Soo Tab 3 of this Annox fcr voteec radio call signs to bo used in «and by the RadSa.o Radio Reporting Net. ine, w * ~le- = Poee “Spor. + . wee ? Gah