What is the truFYX EXT?
The truFYX EXT is a high-performance, non-certified SBAS GPS receiver designed specifically for UAS autopilots and ADS-B OUT applications. It uses the same core GPS-SBAS engine and antenna as the TSO-certified truFYX, but adds a rugged enclosure, internal heater, and barometric altimeter.
How is the truFYX EXT different from the certified truFYX?
It is functionally identical in GPS performance but is not FAA TSO-authorized (non-certified). It has a more robust mechanical design with an internal heater and baro altimeter for extreme environments. The truFYX EXT works without SkyLine ARS systems. More information on set up found here.
Who is the truFYX EXT intended for?
UAS manufacturers, system integrators, and operators who need a high-integrity, low-SWaP GPS position source for autopilots, ADS-B, or BVLOS command-and-control systems.
Is the truFYX EXT certified?
No, it is non-certified, but it meets the performance requirements of TSO-C145e Class Beta-1 (including RAIM/FDE integrity).
What standards does it comply with?
(1) RTCA DO-229E Class Beta-1. (2) DO-178C Level C (software). (3) DO-254 Level C (hardware). (4) DO-160G environmental qualification. (4) SIL 3 / SDA 2.
Can it be used as a primary navigation source for ADS-B or in controlled airspace?
Yes, it meets the performance requirements for primary ADS-B position source and en-route/terminal navigation when SBAS is available, and maintains integrity via FDE when SBAS is lost.
What accuracy can I expect?
Horizontal (HPA): 5 m (95%) Vertical (VPA): 7 m (95%) Velocity: 3 m/s Time: 30 ns RMS Update rate: 5 Hz
How sensitive is the receiver?
Acquisition: –148 dBm | Tracking: –167 dBm.
Does it include a barometric altimeter?
Yes, an integrated barometric pressure sensor is included.
What types of aircraft is truFYX EXT compatible with?
truFYX EXT is designed to support all types of aircraft, from small unmanned aerial vehicles to larger manned aircraft, thanks to its external mount design.
What are the size and weight of the truFYX EXT?
55.85 × 46.85 × 15.50 mm, 49 grams.
Does it have an internal or external antenna?
Integrated patch antenna (no external antenna required).
What temperatures can it operate in?
Built to DO-160G Category B2 standards.
Is it waterproof?
Yes, DO-160G Category R (immersion resistant).
What vibration and shock levels does it survive?
Helicopter-level vibration (Curve M) and high shock — designed for fixed-wing, multirotor, and VTOL UAS.
What types of aircraft is truFYX EXT compatible with?
truFYX EXT is designed to support all types of aircraft, from small unmanned aerial vehicles to larger manned aircraft, thanks to its external mount design.
Does truFYX EXT meet FAA requirements for ADS-B systems?
Yes, it meets performance standards of TSO-C145e Class Beta-1 for ADS-B surveillance and navigation.
What is the ECCN?
7A994 (commercial GPS, no ITAR restrictions).
Are there any frequency licensing requirements?
No — it is a receive-only GPS/SBAS unit.
How do I install truFYX EXT on my aircraft?
truFYX EXT is designed for easy installation with minimal wiring and is compatible with various mounting options to suit different airframe configurations.
What protocols does truFYX EXT support?
truFYX EXT supports both NMEA 0183 and MAVLink protocols, allowing for flexible integration with various autopilot systems.
Can one truFYX EXT feed both the autopilot and ADS-B transponder?
Yes — specific configurations provide two simultaneous serial outputs (one high-integrity, one Kalman-filtered) so a single unit can serve both systems.
Which autopilots has it been tested with?
Widely used with Pixhawk (PX4/ArduPilot), VectorNav, Veronte, Micropilot, and many others via MAVLink or NMEA.
Does it work with uAvionix SkyLine C2 systems?
Yes, it is commonly paired with SkyLink/MuLTELink radios in SkyLine BVLOS installations.
What maintenance is required for truFYX EXT?
truFYX EXT requires minimal maintenance. Regular firmware updates and occasional physical inspections are recommended to ensure optimal performance.
What should I do if truFYX EXT is not acquiring a GPS signal?
Ensure that truFYX EXT has a clear view of the sky and check for any obstructions. Verify all connections and settings according to the installation guide. If problems persist, contact support for further assistance.
I still have questions. Where do I go for customer support?
For additional customer support, please submit a Support Ticket to the uAvionix customer support team.
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