Radio FAQ's

Below are some FAQ’s regarding Trig radios

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.

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. If using a dynamic microphone with a Trig radio please note an amplified adaptor will be required.

How does the 'Push Step' feature affect 8.33kHz tuning?

The 8.33/25K push step does not affect the mode of the radio. You cannot turn off the 8.33 capability. The push step is only changing the size of the steps when you are tuning. It’s there to make tuning faster – 4 times less turns to reach your desired frequency. For example, if you tune to an 8.33 channel, then click the push step to display the small 25k symbol, then you are still transmitting and receiving on the 8.33 channel you selected… only the size of the tuning steps changes for when you next turn the tuning knob.

Can I play music through the radio?

All Trig 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 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.

However, the TY97 requires a supply of 22 to 33 volts so cannot be powered by battery.

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

For information on installing Trig radios both the operation manual and install manual can both be viewed or downloaded from the Radio Product Pages on the Trig web site. Click here for the TY91 product page and here for the TY96 product page.

Can I use CS-STAN to install a Trig radio?

Trig has created a CS-STAN document to help with your TY96/TY97 installations in EASA aircraft. To find out more about how to use a CS-STAN document – click here.

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 display window.

TC90 software version 1.5 adds support for 8.33 channel spacing on an SL40 GPS.

I've experienced a problem wiring the 25 way connector?

Trig VHF radio installation kits contain a standard 25 way D connector shell made by Amphenol – Trig part number 00866-00.

Each connector has a number assigned to each pin, embossed on the plastic face. Unfortunately a small number of these connectors have the pin numbers marked incorrectly. This has been traced to a specific batch, supplied to Trig. It is possible that a very small quantity of these connectors are in circulation.

We pride ourselves on the quality of our products. If you believe you have an incorrectly numbered connector please get in touch with Trig Support, so we can assist you.

If I am required to comply with the ICNIRP public limits for my aircraft radios, what do I need to do?

The ICNIRP is the International Commission on Non-Ionizing Radiation Protection, and they have proposed limits on the amount of radio frequency energy that the public should be exposed to. These limits cover every transmitting source, from TV stations to 5G mobile phone masts, and includes aircraft radios.

Because the amount of energy that reaches a body is a function of the distance from the transmitter, and because we know the transmit power of our radios, we can work out the safe distance that must be maintained to meet these limits. Fortunately, the average power of our radios is low compared to most broadcast transmitters, and therefore our safe distances are very small. For any Trig transponder, although the instantaneous pulse power is high, the duty cycle and the total transmitter-on time is so short that the average power is well below the 10 W applicability limit for ICNIRP, and therefore your transponder is not affected by ICNIRP.

For our VHF radios, although you probably don’t transmit all the time, it is certainly possible to exceed the 10 W limit. That is even true for our 6 W rated transmitters – because the ICNIRP limit takes account of the antenna gain and directionality, and the field strength can be higher than the nominal power. You therefore need to consider the safe distance for these radios between the transmitting antenna and any member of the public. The actual safe distance will depend on the transmitting antenna configuration, but we have calculated the distances for conventional aircraft antennas.

Allowing for typical antenna cable losses, for our 16 W radios, such as TY97 and TY92, the safe distance is about 1.8 metres or 6 feet. For our 10 W radios, such as TY96 or TY96A, the safe distance is about 1.51 metres, or 5 feet. Finally, for our 6 W radios the distance is about 1.17 metres, or 3 feet 10 inches.

You can see that none of these distances will affect members of the public near to your aircraft in flight, or even whilst operating on the ground. The definition of “general public” also does not include the pilot of the aircraft, or anyone involved in operating the aircraft – they are assumed to be aware of the risks, and to have taken an informed decision to participate.

The “general public” however, does include passengers. You therefore need to consider the orientation of the passenger seats in relation to any transmitting antenna, and the extent to which they are shielded by the cabin structure and by any ground plane provisions. For many metal aircraft the construction means that the occupants are naturally shielded from transmissions, making this less of an issue. For other types, you may need to perform more analysis. Solving that is outside the scope of this FAQ for information about the ICNIRP see