Greenville Avionics

Avidyne AXP340 Mode S Transponder With ADS-B Out

The AXP340 transponder is a panel-mounted Class 1 Mode S Level 2 Datalink Transponder, with support for 1090MHz Extended Squitter (ES), that meets all the current requirements for Mode S elementary surveillance transponders for both IFR and VFR flight. As a slide-in replacement for existing KT76A/KT78A transponders, the AXP340 is designed to easily upgrade existing Mode A/C equipment to Mode S, while adding additional functionality like a Direct-entry Numeric Keypad, Pressure Altitude & GPS Lat/Lon readout, Flight ID entry, one-touch VFR code entry, an easy-to-use Stop Watch Timer, Flight Timer, and Altitude Alerter.

Meeting the Mandate for ADS-B

The AXP340 also supports the latest Version 2 1090 MHz Automatic Dependent Surveillance Broadcast (ADS-B) Extended Squitter, known as “ADS-B out”. Equipping with ADS-B Out will be required in most U.S. airspace by 2020. The AXP340, when linked to a suitable GPS receiver, transmits position information to appropriately-equipped ground stations and other aircraft. This provides improved airborne surveillance, provides vital information for airport ground surveillance, and is a key feature of future airspace plans.

The Mode S Advantage

The AXP340 delivers 240 Watts of transmitter power, and responds to both legacy Mode A/C interrogations and to Mode S interrogations from both ground radar and airborne collision avoidance systems. In the Mode S environment (S stands for Select), a Mode S interrogator can selectively address a single transponder. This allows accurate position plotting with lower reply rates, which in turn reduces frequency congestion and interference.

Your 1090Mhz ADS-B Solution

Coupled with any of Avidyne‘s TAS600A ADS-B capable Traffic Advisory Systems, the AXP340 provides full ADS-B surveillance capability to meet the upcoming mandates for flight internationally and above and below FL180 in the U.S. The AXP340 transmits the required ADS-B Out signals including your aircraft’s GPS-derived position, along with ground track, ground speed and altitude information. The TAS600A provides ADS-B In, allowing you to receive the ADS–B signals from ground radar and from other 1090MHz ADS-B – equipped aircraft and display both ADS-B and non-ADS-B traffic simultaneously for optimal situational awareness and safety.

The AXP340 provides an affordable and lightweight Mode S Surveillance and ADS-B Out solution for fixed wing and helicopter operators.




  • Width: 6.30" (160mm)
  • Height: 1.57" (40mm)
  • Depth: 9.40" (239mm)
  • 2.98 lbs (1.35 kg)
  • Class 1 Mode S Level 2es Datalink
  • Elementary Surveillance
  • TSO C112d, TSO C166b
  • ETSO 2C112d, ETSO C166b
  • ED73E, DO160G, DO178B level B, DO181E, DO254 Level C, DO260B, AC 20-165 ADS-B Out
  • 10 – 33 V
  • Idle: 0.22 A, Active: 0.45 A
  • 240W nominal at connector
  • -20 to +55 C, 35,000ft
  • No external cooling fan required
GPS Compatibility
  • Avidyne GPS (including R9)
  • Garmin GNS430W/530W Series
Other Interfaces
  • Gray Code & Serial Altitude Inputs
  • Serial Altitude Output
  • External Standby Input
  • Weight on Wheels Input
  • External Ident Input