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TN72 GPS Receiver

TN72 – Affordable ADS-B

The TN72 GPS Position Source brings ADS-B Out capabilities to your Trig transponder. Light weight and easy to fit, the highly affordable TN72 uses certified technology making you visible to all ADS-B In traffic devices.

Flying in busy skies with a TN72 will reduce your risk of collision and improve flight safety. In the U.S. the TN72 used as your ADS-B Out solution will trigger a full traffic service uplink – received using ADS-B In equipment.

When using a TN72 there are two different ways to set up your Trig transponder (shown below). The TN72 hardware is the same in either installation.

TN72 GPS – X configuration uses SIL 3 in the transponder settings, and fully satisfies the technical requirements of FAR 91.227 for 2020 compliance. Light-sport, experimental and homebuilt pilots who have fitted a TN72 are now flying inside ADS-B airspace and have passed FAA compliance checks with flying colours.

TN72 GPS – TABS (Traffic Awareness Beacon System) configuration uses SIL 1 in the transponder settings. TABS is the FAA technical standard that enables voluntary equipage of ADS-B Out. The TN72 using TABS is ideal for certified gliders and Part 23 aircraft, operating outside of U.S. 2020 rule ADS-B airspace as a means of enhancing visibility and triggering traffic.

Glider customers in the U.S. looking to get ADS-B equipped may wish to see our ADS-B gliding guidance document this highlights equipment and regulations, for both certified and experimental gliders. In Europe and other countries, where the use of ADS-B equipment is voluntary, then the TN72 TABS configuration is the best way to remain visible to other traffic.

Installing a TN72 and suitable GPS antenna is a small price to pay for enhanced visibility and peace of mind.

  • Simple ADS-B Out upgrade for all Trig transponders
  • Suitable for experimental aircraft / gliders and light-sport pilots for 2020 compliance in U.S.
  • Safer – visible on all ADS-B In systems
  • Enables live tracking of aircraft (with suitable ADS-B In equipment)
  • Triggers traffic information services (TIS-B only available in U.S.)
  • Low cost and light weight
  • Two year world wide warranty

The TN72 supports current and future air to air collision avoidance and situational awareness applications. This enhanced visibility can be useful for tracking club aircraft in real time – improving safety in the circuit and reducing the risk of air-to-air collision.

Compatible products

The TA70 certified antenna is designed to compliment the TN72. In installations where a smaller antenna is required then suitable alternatives can be used, see our FAQ section.  In countries where ADS-B airspace is mandated, operation in ADS-B airspace by certified types usually requires full compliance with TSO-C145 GPS technology, our TN70.

ADS-B

Trig are leaders in ADS-B technology (Automatic Dependant Surveillance Broadcast) and the first company in the world to meet FAA TSO-C166b, the latest standard for ADS-B transponders. Every Trig transponder is Mode S, but also ADS-B Out capable. Once installed ADS-B equipment transmits your aircraft’s precise location directly to other ADS-B equipped aircraft, improving your electronic visibility and safety. To learn more about ADS-B got to our Knowledge Bank article

Product Transponder Configuration ADS-B  Suitability Compliance Supply
Voltage
Antenna Options Sales Part Number
TN72  X (SIL 3)  U.S. – TN72 allows light-sport, home built and experimental aircraft to fly in U.S. 2020 rule ADS-B airspace.

Can also be used by experimental gliders in U.S. 2020 rule ADS-B airspace.

 FAR 91.227 (GPS source) 11-33V Fit a TA70 or suitable alternative Light-sport bundle available includes TT22 XPD, TN72 and TA70 antenna that can be ordered as a single kit. 01685-00-01
TN72 TABS (SIL 1) Europe – ideal for voluntary VFR use

U.S. – suitable for voluntary use (including certified gliders and Part 23 a/c) for use outside of  ADS-B 2020 rule airspace.

Australia – approved for use in gliders & balloons.

New Zealand – ADS-B policy is subject to regulatory review.

TSO-C199

 

 

 

 

 

11-33V

Fit a TA70 or suitable alternative

01685-00-01

Specification TN72 GPS Receiver
Type TABS GNSS
Certification TSO-C199 Class B
Compliance TSO-C199 Class B, DO-160G
Supply voltage (DC) 11 – 33 V
Typical consumption (at 14v) at 14V – 0.1A
Operating temperature -40°C to + 70°C
Cooling requirement no fan required
Weight 110 grams / 3.8 ounces
Connector GPS (power, ground and GPS data) – 9 way D type
Antenna – 5V phantom power – QMA male
Dimensions (mm) H 30 x L 90 x W 63mm (W with base flange 80mm)
Dimensions (inches) H 1.2” x L 3.6” x W 2.5” (W with base flange 3.2”)

What's in the box

  • All Trig products come with a two year warranty, starting from the day of installation
  • Installation manual and Operating manual
  • Installation kit
  • EASA Form One

Frequently Asked Questions

I fly in a certified aircraft in the US, can I use the TN72?
In you are in North America and you wish to fly in ADS-B 2020 rule airspace then you will require full ADS-B compliance. You can use a TN70 GPS Receiver, which is TSO-C145 compliant. If you already have a GNS or GTN WAAS Navigator you can use this as a GPS position source with a suitable Class 1 Trig transponder (TT31 or TT22).
If you only wish to fly outside 2020 rule airspace then the TN72 can be used.

Can the TN72 really help in collision avoidance?
Yes - The TN72 GPS was tested and evaluated as part of Project EVA, a European wide project EASA (SESAR) initiative to test ADS-B technology. Because the TN72 uses certified GPS technology it can be relied upon to provide dependable position reporting for collision avoidance. Unlike uncertified GPS units the TN72 will be visible to all ADS-B In equipped technology.

What are the key benefits of an aviation GPS source like the TN70 or TN72 compared to a consumer GPS receiver?
With good satellite coverage, both will give an accurate position fix – they use the same technology and the same GPS satellite sources. The big difference is how they behave when coverage is poor or lost. A consumer GPS will estimate a position and trajectory for some time after losing satellite data. That gives the user apparent continuity when driving under bridges, or walking past tall buildings, but that behaviour is not suitable for safety critical applications, especially in a dynamic 3d environment like an aircraft. An aviation GPS will perform fault detection and exclusion to remove poor satellite data from any position solution, and will report loss of position integrity or loss of position very quickly. That appears to users that the aviation GPS is “worse” than the consumer GPS, since it gives up reporting a position when the consumer GPS keeps running. That is a deliberate safety design decision.

Why does my certified GPS take longer to find a position fix than my uncertified handheld device when I switch them both on?
Once it has locked on to the satellite transmissions, any GPS receiver needs data on the position of the satellites – called ephemeris data – to calculate the receiver position. Each satellite transmits its own data every 30 seconds. It takes 18 seconds to send the ephemeris data and the other 12 seconds in the cycle contains data about the rest of the satellite constellation. Depending on where in the 30 second cycle the satellites were when the receiver was switched on, it could take between 18 and 30 seconds to acquire the ephemeris data. The downlinked data has parity bits for error detection, but does not support error correction or higher integrity checks. For a safety of life application like aviation, the solution is that a certified receiver must hear the same ephemeris data twice before it is allowed to use it. This means a minimum acquisition time for each satellite of 48 to 60 seconds. Total time will be longer than this taking into account system initialisation, interference, and other environmental factors, but a fix after a minute or so is normal. So how does an uncertified GPS beat that? The first speed gain is simple – consumer GPS doesn’t wait for the second copy of the ephemeris data, it simply believes what it was told the first time. As a result, it can have a position fix in between 18 and 30 seconds. But an even quicker solution is available to a GPS built into a phone or anything else with a data link – instead of waiting for the ephemeris data to be transmitted slowly from the satellite, it fetches the same data from an online server. With a good data connection like a 3G phone, it might take only 1 or 2 seconds to receive all the ephemeris data over the line, and then a GPS position can be determined in less than 5 seconds.

Can the TN72 be used in Europe?
Yes - EASA are keen to encourage pilots to equip with ADS-B equipment. The more pilots who equip with ADS-B Out equipment the greater the opportunity to reduce air to air collisions and improve safety.

Can I use a small puck antenna with the TN72?
Our TA70 antenna is recommended - it provides a highly reliable source for a good quality GPS signal. For alternative antennas our Installation Manual says;
"The TN72 is compatible with any GPS antenna approved to ETSO C 190 or C144a.
Where a non TSO antenna is used, the antenna must include;
- Gain of 20dB or more.
- Active 5 volt powered unit with less than 40mA current.
- Unrestricted view of the horizon.

Note - the antenna socket of the TN72 requires a QMA connector or use of a suitable adaptor.

Can I use an uncertified GPS antenna with the TN72
Yes - the TN72 is a certified product but it is permissible to use an uncertified antenna in combination with the TN72. Naturally the performance of an uncertified antenna should be checked after installation to ensure satisfactory operation.

I already use an ADS-B In traffic receiver - why do I need a TN72?
Many pilots have ADS-B In traffic receivers, but it is important to also have a certified Mode S and ADS-B Out solution. A Trig transponder and TN72 provides a high quality output which is visible to all ADS-B In traffic products. In contrast using an uncertified GPS will make you invisible to certain popular traffic receivers which reject uncertified GPS traffic information.

Can I use a TN72 X GPS outside of the U.S. ?
At the current time the use of a TN72 (configured to SIL3) is for light-sport and experimental types (including experimental gliders) in the U.S. This configuration should be avoided elsewhere as TABS is appropriate transponder setting in Europe for both gliders and powered aircraft.

Can the TN72 be used in Australia and New Zealand
At the current time the TN72 can be used for gliders, balloons and lighter than air types in Australia. In New Zealand, regulators are considering if TABS technology might be suitable for other types. A decision on future ADS-B policy for GA and TSO-C199 equipment use is under review.

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