Profile: Southern Avionics Company manufactures navigational transmitters such as low frequency non-directional radio beacons and DGPS reference station transmitters. Our NDB transmitter's provide the foundation for air navigation safety. The SD series NDB transmitter is a microprocessor controlled NDB designed for comprehensive remote monitoring, maintenance and control via several communication protocols. Our antenna tuning couplers is designed for antenna tuning. It is weatherproof ideal for outdoor and/or offshore environments. Our models are designed to accommodate a complete range of operating frequencies and antenna capacitances with impedance match. We also offer maintainance, on site assistance, testing & inspection and installation services.