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Trig Avionics Limited

Company Overview
Trig Avionics Limited was founded in January 2004 to develop innovative avionics products for general aviation.  Based in Edinburgh, Scotland, Trig are specialists in low power, high tech solutions to existing and emerging requirements in general aviation avionics. Trig is a privately held limited company.

New TY91 Panel Mounted Aviation Radio
The new TY91 radio is a very interesting product. It looks great in the panel next to a Trig TT21 or TT22 transponder. The dual-montitor function makes it possible to hear transmissions on the standby frequency if nothing is being received on the main frequency - enhancing safety.

TT21 & TT22
The TT21 and TT22 are a very interesting new transponders.  They are Mode S transponders with built-in altitude encoders, and remote heads - at a great price!  Also, the TT21 uses half the power used by the Becker ATC4401 - which is very impressive.  You can see a current draw comparison that includes the current required by the altitude encoder used by a Becker transponder here: Transponder Comparison Table.  The TT21 is a Class 2 transponder with 125 Watts of transmit power which is rated for use up to 15,000 feet.  The TT22 is a Class 1 transponder with 250 Watts of transmit power.  Class 1 transponders are used on high performance aircraft – those cruising faster than 175 knots, and operating above 15,000 feet.

ADS-B Out
The Trig TT-21 does not meet the FAA 2020 ADS-B Out requirement for powered aircraft (that gliders are exempt from), and therefore also may not be suitable to provide ADS-B out in gliders should gliders lose that exemption in future. The higher power Trig TT22 does meet the FAA 2020 ADS-B Out requirements. Both the Trig TT21 and TT22 are usable as basic transponders (without 1090ES Out) in the USA, now and after 2020.

A Transponder in Every Sailplane
I strongly believe that every sailplane should have a working transponder in it. I'm sure you will think that is because I sell them. But the main reason is that I fear that in the future a collision will occur between a glider (without a transponder) and a commercial airliner.  In addition to the tragic loss of life, we soaring pilots may lose access to airspace.  It is my sincere hope that this transponder will break down many of the barriers which have kept glider pilots from installing transponders in their gliders.  The units small size and low power consumption make it very attractive. 

Brochures and Manuals
TT21
TT22

Transponder Overview Article
Eric Greenwell has written a very nice article which gives an overview of transponder terminology and available products.  This article was originally published as two articles in Soaring magazine in February and March 2002,
and updated January, 2008 for publication on the Soaring Safety Foundation web site.  Eric flies with a Becker transponder in his motorglider. 
The article is available here: http://www.soaringsafety.org/prevention/articles.html.

Transponder Comparison Table
The Transponder Comparison Table makes it easy to compare specifications of the available transponders.

Transponder Antenna Tips
DG has an excellent document on their web site with details on how to mount transponder antennas to gliders. 
http://www.dg-flugzeugbau.de/Data/TN-DG/service-infos/2004-53-e.pdf

Warranty (U.S.A. Customers)
SEA_TT21_Warranty.pdf


Example Radio Systems

TY91 Radio - for Single-seat Sailplane
Trig TY91
Panel Mount
Aviation Radio

Cable-TY91-1SeatGlider-0p5
Wiring
Harness

Peiker KL-1 Speaker
4 Ohm, 5 Watt
Dittel F10050
Push-To-Talk
Switch
Peiker TM168-24in
Gooseneck Microphone
TY91 Radio - for Two-seat Sailplane
Trig TY91
Panel Mount
Aviation Radio

Cable-TY91-2SeatGlider-0p5
Wiring
Harness

Peiker KL-1 Speaker
4 Ohm, 5 Watt
Dittel F10050
Push-To-Talk
Switch
Peiker TM168-24in
Gooseneck Microphone
 

Example Transponder Systems

TT21 Transponder System
or or or
Trig TT21
Transponder
(certified to 15,000 ft)

Cable-TT21-TC20-0.5
or
Cable-TT21-TC20-1
or
Cable-TT21-TC20-3

or
Cable-TT21-TC20-5
Wiring
Harness

Cable-Ant-LMR240-BNCm-TNCm-3
Antenna Cable
Antenna
RAMI-AV-22 or RAMI-AV-74-1
or AAE L2
 
TT22 Transponder System
or or or
Trig TT22
Transponder
(certified to 35,000 ft)
Cable-TT21-TC20-0.5
or
Cable-TT21-TC20-1
or
Cable-TT21-TC20-3

or
Cable-TT21-TC20-5
Wiring
Harness
Cable-Ant-LMR240-BNCm-TNCm-3
Antenna Cable
Antenna
RAMI-AV-22 or RAMI-AV-74-1
or AAE L2
 

Wiring harness for connecting TT21 or TT22 to TC20 and 12V power - $145 (0.5 m or 1 m) or $155 (3 m)
The basic system includes all the required connectors, but they are not wired together.  This is a pre-wired wiring harness which makes installation faster and trouble-free.  It may also save you delays and repair bills should you accidentally connect something incorrectly.  This wiring harness is assembled and tested using a cable tester by Larry Goddard.  It has a DB-9f connector at the TC20 end and a DB-25m connector at the TT21 end.  It also includes power leads for 10 to 30 VDC. There are 3 cable length options: 0.5 m (19.7 inches), 1 m (3.281 feet) and 3 m (9.84 feet).  The 0.5 m length is perfect for installations where the TT21 Transponder Unit will be mounted near the TC20 Control Unit (such as in front of the instrument panel in the nose of a glider) and the 3 m version should be long enough for mounting the TT21 unit behind the pilot, near where the antenna is installed.
Note: Wiring for external "Squat" and "Ident" switches is not included.  The squat switch input is only for aircraft with built-in squat switch circuitry.  It is my understanding that a landing gear switch in a glider can not be used as a squat switch because it would cause the transponder to send incorrect information while the landing gear is down during aerotow and in the landing pattern.  The "Ident" switch is not necessary because the "IDT" pushbutton on the TC210 control unit has the same function.

Antenna Cables
I offer transponder antenna cables made by Larry Goddard in several lengths.  They include a TNC connector for connection to the transponder and a BNC connector for connection to a transponder antenna.  They are available in 1 m (3.281 ft), 3 m (9.84 feet) and 5 m (16.4 feet) lengths.

Transponder Antennas
Several transponder antenna options are listed on the Antennas page.  The RAMI rod style and "shark fin" styles are the most popular.  I recommend the shark fin style because I recall from my fluid dynamics courses that the two worst types of bodies in regard to drag are spheres and cylinders.  For installations inside fiberglass, wood and fabric gliders, or in the vertical fin in carbon fiber gliders (with the fin made of fiberglass) you may want to consider the L2 antenna from AAE.

Size Comparison
Below is a photo showing just how much smaller the TT21 is than a Becker ATC4401 transponder.  The Becker transponder and ACK A-30.4 altitude encoder are on the left.  The TT21 transponder and TC20 control unit are on the right.  Click on the image to view a larger version.


How to Order
To order a product, click on the
button next to the product. 
When you are ready to complete your order, click on the
button. 
Click on the small images to view larger versions.

Part # Description Photo
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Price

Lead-time

Trig-TY91

Trig TY91 Panel Mount Aviation Radio
The new TY91 radio is a very interesting product. It looks great in the panel next to a Trig TT21 or TT22 transponder. The dual-montitor function makes it possible to hear transmissions on the standby frequency if nothing is being received on the main frequency - enhancing safety.

The Trig TY91 takes up minimal space and weight. The innovative use of a control head and separate radio hardware unit provides more installation options, especially when space is at a premium.

The control head can be conveniently mounted in a full 57mm round hole or even smaller compact mount. Fitting is straightforward, and once installed the depth of the radio control head is only 74mm. In practice this means that the Trig TY91 and TY92 control head can be located in an aircraft instrument panel where a ‘single box’ radio will simply not fit.

Light sport, ultra light, glider and balloon pilots will fit the Trig TY91 radio, this lower powered 6 watt model is ideal for the majority of GA users.

Features:

  • Low Weight
  • Minimal Panel Space
  • Low Power Consumption
  • 6 Watts Nominal Output
  • 8.33 and 25 kHz channel spacing
  • Simple Installation

The TY91 is the perfect comms partner to our TT21 and TT22 Mode S (1090 ES ADS-B Out transponders).

The TY91 is TSO approved for fitting to European and FAA registered aircraft.

Antenna Connector
The TY91 utilzes a TNC (not BNC) connector for the antenna cable connection. TNC connectors are commonly used on transponders. Most sailplane radio installations use BNC connectors. A crimp-on TNC connector is included. Specifications for the required crimping tool are listed in the manual. Or you can use the simple TNC to BNC adapter found below.

Low Voltage Operation
I asked Trig about the low voltage operation of the unit. Their response is below.

This is a common question, but is not well addressed by the certification standards. The "normal minimum voltage" is defined by the RTCA and therefore the FAA as being 11 volts (for 14 volt equipment) or 22 volts (for 28 volt equipment) - we didn't choose that specification point. The corresponding "emergency operating voltage" is defined as 9 volts respectively. This is because according to the standards the nominal bus voltage is 14 volts rather than 12 volts, which is the voltage with the alternator on-line. For those of you who forgot to fit an engine to your airplanes, we understand this can be tricky :-)

At voltages greater than or equal to 11 volts - the voltage chosen by the FAA - wemeet all of the TSO standards, including the rated transmitter power. Our radio is also certified for use in an emergency, and it is considered an emergency whenever the bus voltage is below 11 volts, down to 9 volts bus voltage. At voltages BELOW 11 volts (down to 9 volts) we are allowed to back off the transmit power, which is a good thing because it makes the battery last longer. The Trig radio therefore continues to work, but will transmit a proportionally reduced output power as the bus voltage falls. FYI, at 9 volts the radio will be about 2.7 watts carrier power.

I believe this is how most of the other radios on your comparison page are designed. Some were only designed to work to the 11 volt "minimum". Those that have included the "emergency" voltage all back off to some extent when less volts are available.

The radio puts a warning message on the screen when the voltage falls through 10 volts.

Microphone Compatibility
The TY91 requires an amplified "aviation style" microphone. It will not work with Becker or Dittel or Peker "dynamic" microphones. It will work with the Peiker TM168-24in gooseneck microphone.

Speaker Compatibility
The TY91 requires a speaker of 4 or 8 Ohm, 4 or more Watts. I recommend the Peiker KL-1 speaker.

Wiring Harness
Cumulus Soaring, Inc. offers a Goddard wiring harness for the TY91.

If you prefer to make your own wiring harness - the necessary connectors are included.

Example Systems
See some example systems with wiring harness, speaker, micrphone and PTT switch here: Example Radio Systems

TY91 Brochures, Operating Manuals and Installation Manuals






$1495

In Stock

Adapter-TNCf-BNCm

Adapter - TNC to BNC
This adapter is used to connect an antenna cable with a BNC connector to a radio that has a TNC connector.

$15

In Stock

Trig-TT21

Trig TT21 Class 2 Mode S Transponder with Built-in Altitude Encoder
The TT21 is a very interesting new transponder.  It is a Mode S transponder with a built-in altitude encoder, and a remote head - at a great price! 

Important Note
This Trig TT-21 does not meet the FAA 2020 ADS-B Out requirement for powered aircraft (that gliders are exempt from), and therefore also may not be suitable to provide ADS-B out in gliders should gliders lose that exemption in future. The higher power Trig TT-22 (below) does meet the FAA 2020 ADS-B Out requirements (when used with an approved GPS source). Both the Trig TT-21 and TT-22 are usable as basic transponders (without 1090ES Out) in the USA, now and after 2020.

The TT21 is a Class 2 transponder - certified for use up to 15,000 feet.  The TT22 (below) is a Class 1 transponder - certified for use up to 35,000 feet.  If you plan to fly over 15,000 feet, you will probably want the TT22 (below).

With a front panel controller smaller than a standard instrument, and a remote transponder that is not much bigger than a pack of cards, the TT21 can fit into the smallest of aircraft – and yet it is fully certified and compliant with all the transponder requirements.

  • Low Weight - less than 500 grams!
  • Minimal Panel Space
  • Low Power Consumption
  • 130 Watts Nominal Output
  • Integrated Altitude Encoder
  • Simple Installation
  • Easy to use rotary knobs
  • Support for 1090ES ADS-B Out

The TT21 system is the smallest, lightest, Mode S general aviation transponder. This two part system, which includes an integrated altitude encoder, can fit into the smallest of aircraft – and yet it is fully certified and compliant with all the transponder requirements.

The front panel controller can be installed in a standard 2¼ inch instrument cut-out, or where space is really tight it can fit a compact cut-out just 45mm high. The TT21 transponder itself is also only 45mm high, and can be installed anywhere convenient in the airframe.

Mode S for Light Aviation
The TT21 transponder is an ED-73B Class 2 compliant Mode S level 2 datalink transponder, with support for extended squitter. It meets all the requirements for Mode S elementary surveillance transponders in Europe for aircraft flying below 15,000 feet and with airspeeds below 175 knots. It can be used for both IFR and VFR flight.

The TT21 also supports 1090 MHz Automatic Dependent Surveillance Broadcast (ADS-B) extended squitter, known as “ADS-B out”. This provides improved airborne surveillance, vital information for airport ground surveillance, and is a key feature of future airspace plans. An appropriate GPS receiver is required to enable the ADS-B capability.

Flexible Installation
The TT21 system can be easily fitted to aircraft even when there are space and weight constraints. The front panel controller fits into any panel, and takes less space than a standard instrument. Only a few centimetres are needed behind the panel to allow room for the connector and the static port interface. This means that the TT21 transponder is not just suitable for conventional light aircraft; it can be fitted into gliders, antique aircraft, and flex-wing microlight panels. The control panel is splash proof for open cockpit installations.

A lightweight cable runs from the control panel to the transponder unit which can mounted anywhere in the aircraft. The transponder unit then connects to the antenna and aircraft power supply. A quick release latch secures the main unit to the mounting tray, allowing it to be easily removed for security.

Low Power Design
The TT21 has one of the lowest power consumptions for any transponder. With typical power consumption of around 5 watts, it can operate from battery power for gliders or balloons for long duration flights. In powered aircraft you can be sure that the TT21 is not making heavy demands on your electrical system.

Operating Controls
The front panel controller has easy to operate rotary controls, and a simple layout. The clear LCD screen shows the Squawk Code, reported Flight Level, and operating mode of the transponder.

An altitude encoder is built into the controller, so no extra boxes are needed to complete the transponder system.

Finally, the controller also acts as the configuration module for the combined system. With the controller remaining attached to the aircraft, swapping the TT21 transponder box is possible without needing any reprogramming of airframe settings.

Light Weight
The TT21 system weighs less than 500 grams, with less than 100 grams in the front panel controller. For all aircraft low weight translates into more payload and better efficiency, but for microlight aircraft where certification weight limits are tight the low weight of the TT21 system may make it possible for the first time to fit a transponder.

TT21 Specifications

Type:

Class 2 Mode S Level 2 Datalink

Certification:

ETSO 2C112b, C88a, TSO C112, C88b

Compliance:

ED73B, DO160E, DO178B level B, DO254, DO181C, DO260A

Supply Voltage (DC):

10 – 33 V (works down to 9 V)

Typical Current Consumption:

Idle: 0.15 A (at 14V)

 

Active: 0.28 A (at 14V)

Transmitter Power:

130W nominal at connector

Operating Temperature:

-40 to +70 C

Cooling Requirement:

No fan required

Weight:

1.0 lb (450 g)

Dimensions:

Controller: 64 x 45 x 45 mm
Transponder: 62 x 45 x 141 mm

Included:

  • TT21 Transponder Unit (box)
  • TC20 Control Unit (User Interface)
  • Mounting Tray for TT21 transponder unit
  • Adapter for mounting the TC20 in a 57 mm (2 1/4") instrument hole (with mounting screws)
  • Mounting screws for mounting the TC20 without the use of the adapter for 57 mm instrument hole
  • Pneumatic tubing for connection to static port (connects to TC20 Control Unit)
  • Tee connector for pneumatic tubing
  • 2 x Straight connector for pneumatic tubing
  • DB-25 m Connector and backshell for TT21 unit
  • DB-9f Connector and backshell for TC20 unit
  • Hose clamps for securing pneumatic tubing in aircraft
  • TNC connector for antenna (connects to TT21 box)
  • Installation Manual
  • Operating Manual

Not Included:

  • Wiring harness for connecting TT21 to TC20 and 12V power.  Wiring details are in the installation manual (see link below).  All connectors are included, but they are not wired together.  Pre-made wiring harnesses are available.  You can see details here.

TT21 and TT22 Brochures, Operating Manuals and Installation Manuals

  $2280 In Stock
Trig-TT22

Trig TT22 Class 1 Mode S Transponder with Built-in Altitude Encoder
The TT22 is a very interesting new transponder.  It is a Mode S transponder with a built-in altitude encoder, and a remote head - at a great price! 

Important Note
The Trig TT-21 (above) does not meet the FAA 2020 ADS-B Out requirement for powered aircraft (that gliders are exempt from), and therefore also may not be suitable to provide ADS-B out in gliders should gliders lose that exemption in future. This higher power Trig TT-22 does meet the FAA 2020 ADS-B Out requirements (when used with an approved GPS source). Both the Trig TT-21 and TT-22 are usable as basic transponders (without 1090ES Out) in the USA, now and after 2020.
At this time, a "certified" GPS ($3500) is required for use with the TT22 to meet the FAA's ADS-B Out requirements. Howver, I explect lower cost GPD units to be approved for use with the TT22 before 2020.

The TT22 is a Class 1 transponder - certified for use up to 35,000 feet.  The TT21 (above) is a Class 2 transponder - certified for use up to 15,000 feet.  If you plan to fly over 15,000 feet, you will probably want the TT22 (this one).

With a front panel controller smaller than a standard instrument, and a remote transponder that is not much bigger than a pack of cards, the TT22 can fit into the smallest of aircraft – and yet it is fully certified and compliant with all the transponder requirements.

  • Low Weight - less than 500 grams!
  • Minimal Panel Space
  • Low Power Consumption
  • 250 Watts Nominal Output
  • Integrated Altitude Encoder
  • Simple Installation
  • Easy to use rotary knobs
  • Support for 1090ES ADS-B Out

The TT22 system is the smallest, lightest, Mode S general aviation transponder. This two part system, which includes an integrated altitude encoder, can fit into the smallest of aircraft – and yet it is fully certified and compliant with all the transponder requirements.

The front panel controller can be installed in a standard 2¼ inch instrument cut-out, or where space is really tight it can fit a compact cut-out just 45mm high. The TT22 transponder itself is also only 45mm high, and can be installed anywhere convenient in the airframe.

Mode S for Light Aviation
The TT22 transponder is an ED-73B Class 1 compliant Mode S level 2 datalink transponder, with support for extended squitter. Class 1 transponders are used on high performance aircraft – those cruising faster than 175 knots, and operating above 15,000 feet.

The TT22 also supports 1090 MHz Automatic Dependent Surveillance Broadcast (ADS-B) extended squitter, known as “ADS-B out”. This provides improved airborne surveillance, vital information for airport ground surveillance, and is a key feature of future airspace plans. An appropriate GPS receiver is required to enable the ADS-B capability.

Flexible Installation
The TT22 system can be easily fitted to aircraft even when there are space and weight constraints. The front panel controller fits into any panel, and takes less space than a standard instrument. Only a few centimetres are needed behind the panel to allow room for the connector and the static port interface. This means that the TT22 transponder is not just suitable for conventional light aircraft; it can be fitted into gliders, antique aircraft, and flex-wing microlight panels. The control panel is splash proof for open cockpit installations.

A lightweight cable runs from the control panel to the transponder unit which can mounted anywhere in the aircraft. The transponder unit then connects to the antenna and aircraft power supply. A quick release latch secures the main unit to the mounting tray, allowing it to be easily removed for security.

Low Power Design
The TT22 has one of the lowest power consumptions for any transponder (other than the TT21). With typical power consumption of around 6 watts, it can operate from battery power for gliders or balloons for long duration flights. In powered aircraft you can be sure that the TT22 is not making heavy demands on your electrical system.

Operating Controls
The front panel controller has easy to operate rotary controls, and a simple layout. The clear LCD screen shows the Squawk Code, reported Flight Level, and operating mode of the transponder.

An altitude encoder is built into the controller, so no extra boxes are needed to complete the transponder system.

Finally, the controller also acts as the configuration module for the combined system. With the controller remaining attached to the aircraft, swapping the TT22 transponder box is possible without needing any reprogramming of airframe settings.

Light Weight
The TT22 system weighs less than 500 grams, with less than 100 grams in the front panel controller. For all aircraft low weight translates into more payload and better efficiency, but for microlight aircraft where certification weight limits are tight the low weight of the TT22 system may make it possible for the first time to fit a transponder.

TT22 Specifications

Type: Class 1 Mode S Level 2 Datalink

Certification:

ETSO 2C112b, C88a, TSO C112, C88b

Compliance:

ED73B, DO160E, DO178B level B, DO254, DO181C, DO260A

Supply Voltage (DC):

10 – 33 V (works down to 9 V)

Typical Current Consumption:

Idle: 0.15 A (at 14V)

 

Active: 0.34 A (at 14V)

Transmitter Power:

250 W nominal at connector

Operating Temperature:

-40 to +70 C

Cooling Requirement:

No fan required

Weight:

1.0 lb (450 g)

Dimensions:

Controller: 64 x 45 x 45 mm
Transponder: 62 x 45 x 141 mm

Included:

  • TT22 Transponder Unit (box)
  • TC20 Control Unit (User Interface)
  • Mounting Tray for TT22 transponder unit
  • Adapter for mounting the TC20 in a 57 mm (2 1/4") instrument hole (with mounting screws)
  • Mounting screws for mounting the TC20 without the use of the adapter for 57 mm instrument hole
  • Pneumatic tubing for connection to static port (connects to TC20 Control Unit)
  • Tee connector for pneumatic tubing
  • 2 x Straight connector for pneumatic tubing
  • DB-25 m Connector and backshell for TT22 unit
  • DB-9f Connector and backshell for TC20 unit
  • Hose clamps for securing pneumatic tubing in aircraft
  • TNC connector for antenna (connects to TT22 box)
  • Installation Manual
  • Operating Manual

Not Included:

  • Wiring harness for connecting TT22 to TC20 and 12V power.  Wiring details are in the installation manual (see link below).  All connectors are included, but they are not wired together.  Pre-made wiring harnesses are available.  You can see details here.

TT21 and TT22 Brochures, Operating Manuals and Installation Manuals

  $2295 In Stock

Cumulus Soaring, Inc.
Paul E. Remde

8661 Connelly Place
Savage, Minnesota 55378
USA


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