Coverage: 0.550 - 42 MHz in 6 bands, AM or CW mode, features motor driven tuning with auto reverse and adjustable stops, crystal filter, ANL, BFO, IF output jack for connection of a PAN-adaptor, S-meter, power source from an outboard 28 volt dynamotor, unit was designed for military aircraft use, electrically very similar to the SX-28 but physically radically different, audio output for headphone only.