A-30.5 Altitude Encoder

The model A-30 digitizer is designed to work with all modern mode A/C and mode S transponders. In mod 4 through mod 7 configurations, the digitizer reports to 30,750 feet and provides parallel grey code output. The mod 5 and mod 9 configurations are plug compatible with all earlier mod 1 through 4, and mod 8 digitizers with serial numbers 2,400 through 120,499.