190-01182-02 GTR 225/GNC 255 TSO Installation Manual
Rev. B Page 6-11
6.4.4 Audio Configuration
6.4.4.1 COM Sidetone
The COM Sidetone page (Figure 6-18) allows the installer to adjust the COM sidetone volume. COM
sidetone is the audio spoken into the COM microphone. This setting only affects the volume of the
sidetone for the GTR/GNC COM during PTT. To adjust the COM sidetone volume, rotate the smaller
inner knob to the desired value. This field is adjustable in the range of 0 (zero) to 100. The default is 50.
Figure 6-18. COM Sidetone Page
6.4.4.2 Mix NAV Audio
The Mix NAV Audio page (Figure 6-19) allows the installer to configure whether NAV audio is mixed
with the COM headphones. With this option set to ‘On’, the NAV audio will be sent along with COM
audio to the pilot’s headphones and the audio will be ‘mixed’. With this option set to ‘Off’, the NAV audio
will not be heard in the pilot’s headphones. The NAV audio will still be sent over the analog audio lines on
P2002-16 and 17. In installations with an audio panel, this should be set to ‘Off’. Use the smaller inner
knob to select On or Off. Press ENT when the appropriate selection is displayed.
Figure 6-19. Mix NAV Audio Page
6.4.4.3 Hi-Fidelity Audio
The Hi-Fidelity Audio page (Figure 6-20) allows the installer to enable or disable the hi-fidelity Aux audio
input on the GTR/GNC. If a music audio source is connected to P2001-3 and 19, it may be desirable to
enable the Hi-Fidelity audio. Use the smaller inner knob to select On or Off. Press ENT when the
appropriate selection is displayed.
Figure 6-20. Hi-Fidelity Audio Page
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