The SAE 5-35 altitude encoder provides accurate altitude data by combining altitude encoding, digital altitude on two RS-232 outputs, and altitude inflight monitoring (AIM) into a single compact and reliable unit. The SAE 5-35 provides Gillham Grey Code to the aircrafts Mode C transponder using innovative pressure circuitry that greatly reduces warm up time. This unit provides altitude data from -1,000 to 35,000 feet ideal for installations in piston, turbine, and jet aircraft.