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Trig Avionics

All prices exclude VAT.
Not all of our products are online at this time, but we do sell the entire Trig Avionics range and will price match to any authorised seller. Try the search facility (top right) or please call us on 01488 71774 if you cannot find what you are looking for.

TY91 & TY92 833kHz Compact VHF Radios

TY91 and TY92 Controller and hardware.jpg
TY91 and TY92 Controller and hardware.jpg

TY91 & TY92 833kHz Compact VHF Radios

from 995.00

All prices exclude VAT.

Free Postage & Packing on this item. Signed for tracking will be applied regardless of which postage option you choose.

Trig’s compact radio is the ideal retro-fit that can be installed in the smallest panel. The TY91 is certified and highly capable. Easy to use and faster to tune, it takes up minimal space and weight. The unique ‘Push Step’ feature provides the fastest in class frequency selection. Dual Watch allows you to monitor two channels at the same time – it’s like having two radios in one. Compatibility with various EFIS systems enables remote control of the TY91 radio – it can even populate the on-route frequency from a connected GPS. A memory function provides fast frequency selection for your most used frequencies. A built-in intercom with mic gain adjustment on each headset ensures great performance, even when headsets brands don’t match.

The TY92 is the hi-power version to satisfy IFR requirements.

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Compact size, low weight – takes minimal panel space, only 74mm deep

  • Unique ‘Push Step’ feature provides the ‘fastest in class’ frequency selection

  • Dual watch – monitor two frequencies at the same time

  • Manual dimming feature (adjustable backlight)

  • Dual Control – two controller option for tandem cockpits

  • Simple Installation

  • Free European Minor Change approvals


With a crisp clear display and simple user interface the Trig radio benefits from some great features; ‘Dual Watch’ feature allows monitoring of two frequencies at the same time. There are 9 pre-set channel memories which are easily selectable.

Trig’s compact radio is EASA ETSO and FAA TSO approved so it can be used worldwide. Our ‘Push Step’ feature enables the fastest tuning  in its class – three times faster than in an 8.33 environment! 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 if required.

Trig radios also feature a built-in high quality two place intercom with an aux-input, saving further cost and weight.


The radio can integrate with popular GPS units; this allows the automatic display of en-route radio frequencies. Control of the radio via an EFIS display is also possible using industry standard SL40 and GTR225 protocols. This unique capability integrates your Trig radio with other avionics and provides real user flexibility.


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 compact control head can be located in an aircraft instrument panel where a ‘single box’ radio will simply not fit. The compact radio is the perfect comms partner to our compact transponder Mode S (1090 ES ADS-B Out transponders).


The compact radio display is clear and bright, showing both primary and secondary frequencies. A ‘Push Step’ knob allows the fastest change from 8.33 kHz to 25 kHz – so you can tune the radio quickly without compromising your look-out. The Dual Watch feature allows two frequencies to be monitored at the same time – it’s like having two radios in one.


The Trig compact radio two place intercom is optimised for use with standard aviation headsets – a number of adjustments allow the radio to be used successfully in noisy aircraft.  The compact radio 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.


  • Trig products come with a two year warranty, starting from the day of installation

  • Installation manual and Operating manual

  • Installation kit (including plastic brackets for round mounts)

  • Tray

  • EASA Form One


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.

How does the 'Push Step' feature affect 8.33kHz tuning?
When you push the 'Push Step' button (right hand knob), you are swapping between 8.33kHz and 25kHz tuning steps. This does not affect the radio behaviour. It is purely to allow for faster tuning. So while your radio might display 25kHz in the bottom right of the screen, this does not mean you have lost 8.33kHz capability. It means that when you tune your radio, it moves in 25kHz steps.

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.

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?
Trig's compact radios 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?
Yes - Trig's compact 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. Please find the manuals in the left hand navigation of the Trig Avionics Webpage found here.