A NEW system of short-wave radio communication is planned in East Africa, where a total of forty-eight Marconi short-wave transmitters are to be installed to provide a comprehensive communications network for ground-to-air and point-to-point communications for the rapidly expanding civil aviation services—both local and trunk routes—and for administrative, public and meteorological traffic. The new services, which will operate throughout the three territories of Kenya, Uganda and Tanganyika, are required to meet the needs of post-war expansion and re-organisation of the East Africa Posts and Telegraphs Department‘s Services. Two of the latest types of Marconi transmitters have been chosen for this new service. They are Type TGS. 541—a 200-watt transmitter With a frequency range of 1·5–23 Mc./s., and Type TGS. 501—a 100-watt set covering a frequency range of 1·5–13 Mc./s. Both types of transmitter are compact, easily operated equipments designed for operation on radio telephony or telegraphy. Special features include crystal-control with provision for the rapid selection of any one of six working frequencies —a particularly useful asset where a large volume of traffic is handled. Frequency tolerances are Well Within the very fine limits laid down by international regulations. Work has already begun at the Marconi Company‘s Chelmsford Works on the construction of the first of these transmitters which are to be installed at Mbeya Airfield, Tanganyika.