Comtech means contact. Through its subsidiaries, Comtech Telecommunications operates in three divisions: mobile data communications, telecommunications transmission, and radio-frequency (RF) microwave amplifiers. The company makes equipment used largely by the US government and related defense contractors. Other customers include satellite systems integrators, communications service providers, and oil companies. Its transmission equipment includes modems, frequency converters, very-small-aperture terminal (VSAT) satellite transceivers and antennas, and microwave radios. Comtech's RF amplifiers enable wireless instrumentation and medical systems and provide satellite-based messaging services and location tracking.