Private transmitter
A private transmitter was a communications device owned and operated by a private individual or family, rather than a station or starbase. George Samuel Kirk had a private transmitter with the call sign GSK-783. ()

Doctor Manway, the leader of a Federation science team in the Malurian system, had a private transmitter. In 2267, James T. Kirk questioned whether Lieutenant Nyota Uhura was receiving anything from it, as the Malurians' distress calls had already ceased, but there was nothing. ()

Later in that same year, Lt. Uhura noted George Samuel Kirk's transmitter's classification as private when Captain James T. Kirk requested that she contact it. ()
Communications technology