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.

SKU: A-30.9 Categories: , Tags: ,


This digitizer (EDMO# A-30.5) includes a quick release mounting tray, 4 foot harness, 4 foot static line, installation manual.


  • Provides gray code to 30,750 ft
  • Plug compatible with earlier models
  • Drop-in replacement for most model A-30 encoders
  • FAA TSO C-88a


5.1 oz (144 g)

Dimensions (L x W x H):
6 x 2.65 x 1.3 in

Range (mod 5):
950 to 30,750 ft

± 20 ft, typical
±50 ft, maximum

Operating Current:
160 mA, typical

Warm-up Current Draw:
14 VDC 160 mA
28 VDC 220 mA

Warm-up Time:
70°F ambient 60 seconds (0°C ambient 210 seconds)

Operating Voltage:
10 VDC to 32 VDC

Operating Temperature:
-4°F to 131°F (-20°C to 55°C)

Altitude Resolution:
grey code (parallel) output 100 ft

German LBA 10.221/4

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