Senior Airman Otis Osborn, 28th Communications Squadron radio frequency transmissions technician, connects an audio analyzer to a portable radio during scheduled maintenance in the 28th CS Radio Maintenance shop on Ellsworth Air Force Base, S.D., Feb. 7, 2013. The audio analyzer provides a test signal modulated through the radio to simulate transmission frequencies over the radio, allowing technicians to accurately locate any malfunctioning areas. (U.S. Air Force photo by Airman 1st Class Kate Thornton-Maurer/Released)