190-01878-02
GMA 342/345 Installation Manual
Rev. 5
Page 2-10
2.8.6 Front Panel Configuration
NOTE
The GMA 345 (2-COM version) is used as the example for this section. Some of the
GMA 345 3-COM unit button text labels differ from the 2-COM version. Where this
occurs, the 3-COM unit text label will be indicated in brackets following the 2-COM
version button text label. For example: SPKR key [COM3 MIC for 3-COM unit].
Enter configuration mode by holding down the COM1 MIC and SPKR [COM3 MIC for 3-COM unit]
buttons while turning the unit on.
When in configuration mode:
• Pressing the PLAY button will annunciate the current software/database product version, e.g.
“system two dot zero zero”.
• Pressing the COM1 MIC key selects volume mode.
◦ Press the COM1 MIC key until the desired volume is annunciated, e.g “auxiliary one
volume”.
• Pressing the COM2 MIC key selects Master Avionics Squelch mode.
• Pressing the SPKR [COM3 MIC for 3-COM unit] key annunciates the current option, e.g. “Music
During Isolation Enabled” or “Cockpit High Noise Disabled”.
◦ Cockpit High Noise configuration applies more filtering to the intercom mic audio. In higher
noise cockpits, this can improve voice intelligibility. In moderate to lower noise cockpits,
the default filter usually provides better intelligibility.
◦ Music During Isolation configuration changes the behavior of the PILOT and CREW
isolation modes such that music is still heard by the pilot and copilot when they are isolated
from the passengers.
• Pressing the TEL key selects Marker Beacon sensitivity offset mode. Press the TEL key until the
desired Marker Beacon sensitivity mode is annunciated, e.g. "Marker Beacon Low Sensitivity".
• Pressing the PILOT key increases the selected setting as indicated by the LEDs on the Level Bar.
• Pressing the CREW key decreases the selected setting as indicated by the LEDs on the Level Bar.
• When adjusting Options in configuration mode, the PILOT and CREW keys are used to indicate
the current state and change the state.
◦ If the option is enabled, the PILOT key is lit solid and the CREW key flashes (indicating that
the CREW key can be pushed to disable the option).
◦ If the option is disabled, the CREW key is lit solid and the PILOT key flashes (indicating
that the PILOT key can be pushed to enable the option).
◦ The Level Bar is not used when in the options mode.
• The LEDs in the Level Bar (Figure 2-3) light to indicate an increase/decrease in the selected
setting.
• Pressing COM1 and MKR buttons simultaneously resets the configuration and operating state
back to factory defaults.
