RD-379A(V)/UNH General Description The RD-379A(V)/UNH is a solid state magnetic tape recorder capable of recording 8 channels audio, DAIR FSK, and time code signal. Purpose of the RD-379A(V) UNH is to record audio and IFF Video in support of air traffic control operations. It is used aboard ships and naval air stations where records of naval flight operations are required to be maintained by the FAA (Federal Aviation Administration). The system is maintained on regular bases by electronics technicians assigned to the air operations department.