AS9100 Rev D/ISO 9001:2015 Certified
Serving the Aviation Industry since 1973
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A-30.5 Altitude Encoder
(DAI Part# A30.5)
FAA TSO-C88a approval
Latest solid state electronics for high reliability
The smallest, lightest, highest quality encoder available
Add mode C capability the most cost-effective way
Quick and easy installation
Compatible with most transponders in use today
Code compatible with all classes of mode S transponders
Mod 5 reports altitude to 30,750'
Mod 9 reports altitude to 42,000'
3-year guarantee
Mod 9 provides 2 RS232 outputs

Quick release mounting tray
4' color coded wiring harness with pre-wired jack
Static line and fittings for installation in any aircraft
Installation manual with popular transponder pin outs
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Range A30.5
Rang A30.9
-950 to 30,750'
-950 to 42,000'
Accuracy Typical ±20' maximum ±50'
Size 6"(L) x 2.65"(W) x 1.3"(H)
Weight 5.1 oz.
Operating Voltage 10 to 32VDC
Operating Current 80 mA typical
Operating Temperature -4°F to 131°F
Warm-Up Current Draw 14VDC 420 mA
28VDC 220 mA
Warm-Up Time 70°F ambient 60 sec.
0°F ambient 210 sec.
Altitude Resolution Gray code (parallel) output 100' RS232 10 or 100'
RS232 10or 100'
RS232 Outputs
Apollo/UPS 1200 baud17 byte message
Trimble/Garmin 9600 baud10 byte message
Northstar/Garmin 2400 braud10 byte message
DO-160B Environmental
Compatibility 4096
Compatible with virtually all transponders
Code Transponders
Mode S Compatibility
in use today
Compatible with all classes of mode S transponders
All wire supplied with product is tested and complies with FAR23, 1359 and FAR23.853