Trig Avionics


TY91 - Compact VHF Radio - 6 Watt

Trig - Better by Design

Not all compact radios are the same. The TY91 is easier to use and faster to tune, consistent with our ‘better by design’ philosophy. The TY91 has a unique ‘push step’ feature providing the fastest in class frequency selection. With additional features like Dual Watch and a built-in intercom the TY91 is ideal for most GA users requiring a certified aviation radio.

To order your TY91 contact your Approved Trig Dealer now.

Product features

  • Compact size, low weight – takes minimal panel space, only 74mm deep
  • 8.33 and 25 kHz channel spacing – compliant where 8.33 is required.
  • Unique ‘Push Step’ feature provides the ‘fastest in class’ frequency selection
  • Dual watch – monitor two frequencies at the same time
  • Displays on route frequency and airfield identifiers (requires compatible GPS)
  • Optional control of radio via third party EFIS (includes GTR 225 protocol)
  • Manual dimming feature (adjustable backlight)
  • Dual Control – two controller option for tandem cockpits
  • Low power consumption
  • 6 Watts nominal output
  • Simple installation
  • EASA ETSO and FAA TSO certification
  • Free European Minor Change approvals
  • Unbeatable value and quality – designed and manufactured in the U.K.
  • Two year worldwide warranty

Product description

The Trig TY91 takes up minimal space and weight. With a crisp clear display (with manual dimming) and simple user interface the Trig radio benefits from some great features; ‘Dual Watch’ allows the monitoring of two frequencies at the same time. There are 9 pre-set channel memories which are all easily selectable. The radio can integrate with popular GPS units; this allows the automatic display of on route radio frequencies (uses industry standard SL40 protocol). The radio also has a built-in two place intercom with an aux-input, saving further cost 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 (2 ¼”) round hole or even smaller compact mount.  Fitting is straightforward, and once installed the depth of the radio control head is only 74mm (3”).  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. The TY91 is the perfect comms partner to our TT21 and TT22 Mode S (1090 ES ADS-B Out transponders).

The TY91 is EASA ETSO and FAA TSO approved so it can be used worldwide. For customers who do not require 8.33 channel spacing this feature can be disabled, allowing speedy selection between 50 kHz and 25 kHz spacing. This enables rapid change of frequency whilst providing fine tuning in 25 kHz steps. The TY91/TY92 are both 8.33 kHz and 25 kHz radios, this means they already comply with future planned airspace changes in Europe, when 8.33 kHz becomes mandatory.

The TY91 Trig radio two place intercom is optimised for use with standard aviation headsets – a number of adjustments allow the radio to be used in noisy aircraft.  The TY91 also has a built in speaker amplifier that can drive an external speaker, this is preferred by some glider pilots. If using a dynamic microphone with a Trig radio please note an amplified adaptor will be required.

All Trig products come with a two year warranty, supported by our global network of Approved Trig Dealers and Approved Trig Service Centers in the U.S. and Australia. Contact your nearest Approved Trig Dealer now and benefit from our smart, affordable and future proof avionics.

Are Trig radios easy to use?

The radio interface is simple and intuitive. All controls are positive and give good feedback, and can be used with gloves on. The ‘PUSH STEP’ button is a unique feature and allows the fastest selection between 25 kHz or 8.33 kHz steps.

In areas where 8.33 kHz is not used the push step function can be set to change between 25 kHz and 50 kHz steps, making frequency selection just as rapid.


Is the controller display visible in all lighting conditions?

The LCD display is clear and crisp in all lighting, full sunlight generates a very clear contrast and in dull or dark lighting the inbuilt lighting ensures the unit remains clear and legible. The controller has a backlight and manual dimming can be selected to increase or decrease brightness.

How does the compact fit or full round installation work?

All units ship with the necessary parts to enable you to choose to install the radio either as a compact mount or 2 ¼ “ full round. The TY91 and TY92 kit includes a template to assist you in cutting an accurate compact mount hole in the panel. If a full round mounting is required then you simply fit the included plastic blanks above and below the body of the TC90 controller.

What are the main differences between the TY91 and the TY92?

The TY91 is a lower powered 6W radio the TY92 is a 16W radio, which is suited to high performance types. The TY91 will operate on 11-33 volts, the TY92 on 22-33 volts..

Can I link my GPS to the radio?

Yes, if your GPS supports the SL40 protocol then 8.33 channels, in addition to 25 kHz and 50 kHz frequency data and airfield identifiers will be displayed in the TC90 Controller display window. TC90 software version 1.5 adds support for 8.33 channel spacing on an SL40 GPS.

Will I need to change my antenna?

The TY91 and TY92 are designed to operate with your existing operational antenna. One of the advantages of the Trig radio is that the hardware box can be mounted away from the panel and close to the antenna. A shorter antenna cable reduces signal loss and improves performance.

Can I play music through the radio?

Both radios have the capability to play music through your headset via an auxiliary input (mono).

What type of headset should I use?

Trig radios are designed to work with a standard aviation headset. Audio performance is good on both noise cancelling and standard headsets. If you wish to use the radio with headsets that have a built in intercom, such as those used in microlights you are advised to contact to check compatibility. You may require a third party intercom adaptor.

Can I use the radio without a headset?

Both radios have a built in speaker amplifier, this supports the connection of an auxiliary speaker allowing headset free operation. This is ideal suited to glider pilots, who may prefer to fly without a headset. If using a dynamic microphone with a Trig radio please note an amplified adaptor will be required.

Can I use the radios in open cockpit flying?

The TC90 Controller is designed to be splash proof and can be used in these open and harsh environments.

Can I operate the radio on batteries?

Operation of the radio from a battery is a practical option given the efficiency of the radio.  Your Trig radio can be relied upon for many hours when powered by battery, our installation guide, on the Trig web site provides guidance on the best power sources to select and the duration you should expect these to operate for.

Can I use a second control head, connected to the main hardware unit?

Yes – this is called Dual Control and is ideal for tandem gliders and tandem training aircraft.

 How can I find out about the wiring required to install the radio?

For information on installing the radio both the operation manual and install manual can both be viewed or downloaded from the TY91 and TY92 Product Pages on the Trig web site.

When I buy a TY91 or TY92 radio what comes in the box?

When you purchase a TY91 or TY92 Radio (complete) you will receive the following items: radio control head,  hardware unit and tray, install kit, installation and user manuals (in English, German and French) and an EASA Form 1. You will need to supply wiring and have an existing or new antenna.

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