ANNEX_H 0 OPERATIONS ORDER NO, 2-53 COMMUNICATIONS HEADQUARTERS TASK GROUP 7.4, PROVISIONAL Kirtland Air Force Base, New Mexico 6 October 1953, 1800 T 1. GINSRAL, SONTEPT OF COM UNICATIONS-ELSCTRONICS OPERATIONS. a. Commnunications—Electronics facilities for "TIGIR CAT’ will consist of the following: (1) Airborne communications and navigational aids installed in participating aircraft. These will be as outlined in Annex D to Headquarters Task Group 7.4 Operations Order No, 1-53, in so far as possible, (2) HF, VHF, radar and IFF facilities aboard the Command — Ship, USS Estes, (3) HF and VHF radiotelephone and landline telephone ser~ vices in the AOC on North Island Naval Air Station. Facilities and equipment will be furnished by the Naval Air Station. b. (4) An IFF Interrogator in the AOC. (5) Navigational Aids as listed in the current Radio Facil~ (6) Administrative messages traffic will be passed over existing teletype facilities, ity Charts, United States. The primary purpese of GE facilities is to assist in the control, navigatien,.and positioning of aircraft. Al] radio communica~ tions used for this purpose will be voice, VHF radio circuits will be the primary means utilized by the AOC, the CiC and aircraft for control purposes, In addition, one HF radio circuit between the AOC and the CIC will be used for telling control information and as back-up for air~ ground YH" circuits in case VHF contact is lost, Primary positioning facilities will consist of the air search radar of the Commam Ship with the attendant CIC radar scopes using IFF returns from aircraft, all of which will have IFF transponders. Sampling control will be centered aboard the 28-36 Control Aircraft using combination APS-23-APX-6 Inter- rogator Search Radars scanning both upward and downward. All radars will be utilized to obtain headings for navigational purposes. ce A C47 aircraft will be stationed off San Clemente Island at 10,000 feet altitude to serve as an automatic HF relay station between the CIC and the AOC. ad. The WR 9 aircraft will be stationed midway between the CIC and the simulated cloud area during sampling operations to serve as a manual VHF relay stati n between the control RB-36 aircraft and the CIC. eon