190-01115-01 G3X™/G3X Touch™ Avionics Installation Manual
Rev. AV Page 30-171
30.4.27.1 GTR 20 Communication Radio Configuration
For installations using the GTR 20 communication radio, the available options are described in the
following text.
COM Volume - Used to set the received audio volume.
Emergency Volume - Used to set the COM radio volume that will be used if the GTR 20 has
automatically tuned the emergency frequency as a result of losing communication with the G3X system.
Transmit Sidetone - Used to set the volume of the sidetone audio during transmit.
Microphone Gain - Increases or decreases the percent of transmitted modulation which affects the volume
of the received signal, also affects own transmit sidetone.
RF Squelch - Used to set the received signal level required to break squelch. Increasing this setting
increases the signal level required to break squelch. Receiver squelch can be set from 0-10, a setting of 0
(default) represents the factory calibration.
MON Mode On Swap - Setting to Preserve MON will keep the Monitor feature ON when pressing the
Frequency Transfer Key. Setting to Disable MON will turn off the Monitor feature when the Frequency
Transfer Key is pressed.
Discrete Input 1/2 - Used to configure the operation of the discrete inputs per the following listed options:
• Disabled - Discrete input is disabled
• Pilot ICS Key - Discrete input activates the pilot ICS function. Auto squelch and manual squelch
are overridden when the Pilot ICS Key is asserted.
• Copilot ICS Key - Discrete input activates the copilot ICS function. Auto squelch and manual
squelch are overridden by Copilot ICS Key selection.
• Frequency Swap - Discrete input activates the frequency swap function (a beep tone is sounded). If
the discrete input is active for more than two seconds, the emergency frequency will be tuned.
• Toggle MON Mode - Discrete input toggles the state of the MON function
Internal Intercom - Used to enable or disable the internal intercom. The internal intercom is intended for
use in aircraft where the GTR 20 is the radio and there is no separate audio panel or intercom. The internal
intercom must be disabled when used with a separate audio panel or intercom, and/or in a dual-radio
installation. If the communication radio's internal intercom is enabled, the following additional options are
available.
Intercom 3D Audio - When enabled, this option makes the audio sound as if the pilot and copilot are
sitting side by side. The Pilot 3D Position option is then used to select which side of the airplane the pilot
sits on for the purposes of the simulated 3D effect.
Pilot 3D Position - Select Pilot on Left or Pilot on Right to select pilot location. When Pilot on Right is
selected, the copilot is positioned to the left of the pilot for 3D audio processing. The Pilot 3D Position
selection only appears if Intercom 3D Audio is enabled.
Cockpit Noise Level - For very high noise cockpit environments select the High Noise setting, otherwise
select Normal.
Audio Out Gain - When the intercom is enabled, RECEIVER AUDIO OUT will output everything the
pilot hears in the headset ear speakers with the exception of music audio. If RECEIVER AUDIO OUT is
used as the source of audio to a recording device then adjust the AUDIO OUT GAIN setting for desired
audio level at the recording device.
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