ACK A-30.5 Altitude Encoder | Gray Code, TSO’d



ACK A-30.5 Altitude Encoder, equipped with advanced solid-state electronics, offers exceptional reliability. With a swift and effortless installation process that typically takes less than an hour, it is designed to be compatible with most of the transponders currently in operation, reporting altitudes up to 30,750 ft.

The package includes a quick-release mounting tray, a 4-ft. color-coded wiring harness with a pre-wired jack, static line, fittings suitable for any aircraft, and an installation manual featuring popular transponder pin-outs. It also comes with a 3-year warranty.

This ACK A-30.5 altitude encoder is engineered to be compatible with all contemporary mode A/C and mode S transponders. When configured in mod 4 to mod 7, it records up to 30,750 feet and offers a parallel grey code output. Moreover, the mod 5 and mod 9 configurations are seamlessly interchangeable with earlier versions such as mod 1 to 4, and mod 8 digitizers, specifically those with serial numbers ranging from 2,400 to 120,499.

Estimated delivery: June 25th - June 28th
Part Number: A-30.5 Category:

ACK Technologies A-30.5 Altitude Encoder Features

  • 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
  • High-quality build
  • Gold-plated connectors
  • Diecast aluminum chassis
  • Anodized
  • 3 Year Guarantee

Additional information

Weight 0.32 lbs
Dimensions 6 × 2.65 × 1.3 in

German LBA 10.221/4


MOD 5: –950 to 30,750 ft


±20 ft, typical
±50 ft, maximum

Operating voltage

10 VDC to 32 VDC

Operating current

160 mA, typical

Operating temp

-4°F to 131°F
-20°C to 55°C

Warm-up current draw

14 VDC @ 160 mA
28 VDC @ 220 mA

Warm-up time

70°F ambient 60 seconds
0°F ambient 210 second

Altitude resolution

Gray code (parallel) output 100 ft


ACK A-30.5 Altitude Encoder

ACK A-30.5 Altitude Encoder | Gray Code, TSO'd