V/UHF AIRBORNE RADIO SYSTEM

The control Unit selection depends from the application.EPM protection is provided by frequency-hoppingschemes over the 30MHz to 88MHz band (SINCGARS)and 225MHz to 400MHz band (SATURN, HQ I-II).In all cases where specific Customer requirements are tobe met, a SELEX Communications, proprietary frequency,hopping scheme (EASY-II) is available for EPM protection.The SATCOM facilities (built-in for the RT-651/N-NSand RT-651/P versions and external for the RT-651/N-Vversion) allow access to NATO Satellite communicationschannels in the DAMA (Demand Assigned MultipleAccess) mode and to SICRAL satellite covering theMediterranean area.All the versions can operate in a LINK-11 net whenassociated with an external LINK-11 data terminal set(an airborne version of the modem has been recentlydeveloped by SELEX Communications), a capability whichallows use in all missions where co-operation betweennaval and air forces is required.All the versions can be associated with crypto equipment(i.e. KY-58, KY-100, SELEX Communications CM-105,CM-115) for operation in the secure voice/databaseband/diphase modes and with a variety of ancillaryequipment (Homer Indicator ID 1351A or equivalent,Direction Finder AN/ARA -50. DF 301E, Chelton 7-60or equivalent) to enhance operational capabilities.The software oriented design of the RT-651/N allowsimplementation of the different versions primarily byaddition of new software packages or modification of theoriginal ones.At hardware level, RT-651/N has a sliced-modularconstruction which allows for easy replacement oraddition of modules in a stacked way.This allows any of the available versions to be convertedinto another one by software/hardware reconfiguration ofthe operating functions and of the operating parameters.Transceiver Version Frequency range Control Interfaces EPM SATCOM30MHz to 30MHz to Arinc 429 1553 Remote SATURN HQ-I Easy II SINC NATO SICRAL400MHz 470MHz control HQ-II GARSRT-651/N • • • •RT-651/N-A • • •RT-651/S • • • • •RT-651/N-S • • • • •RT-651/N-E • • • • • •RT-651/E • • • •RT-651/N-NS • • • • • •RT-651/P • • • • • • •RT-651/N-V (**) • • • •(*): SATCOM COMMUNICATIONS PROTOCOL I.A.W. MIL-STD-188-181A, /182A AND /183A(**): TDMA-DAMA MODEM NOT EMBEDDED IN THE TRANSCEIVER