Intercom Operation
0638.420-071 Issue 06 02/2021 VHF Transceiver 31
• The transceiver has two internal intercom circuits.
• Up to four headsets are connectable.
• The pilot and co-pilot are connected to the first intercom circuit.
o When intercom is active, both microphone signals are mixed and
amplified.
o The signal is audible on both headphone outputs.
o The internal communication with headsets between both pilots is
possible.
• The passenger headsets are connected to the second intercom circuit.
• ALL mode - Everyone connected to the intercom hear all communications.
o Pilots hear passengers and passengers hear pilots.
• ISOL mode - Isolated intercoms for the pilots (intercom circuit 1) and the
passengers (intercom circuit 2).
o This lets pilots communicate with each other and air traffic, while the
passengers are isolated.
o The passengers on the intercom circuit 2 can hear auxiliary audio (e.g.
from MP3 player) and can communicate with each other.
• An external ISOL input gives the possibility to change between ALL mode
and ISOL mode.
• If the PTT1 input is started and ISOL is active the passenger intercom
operation on second intercom circuit is still possible.
• The intercom operation can be started automatically with
VOX.
• The VOX threshold is adjustable in the intercom menu.
o In tandem installations (application with additional
controller) make the adjustments on the primary
controller.
o In tandem installations with a second intercom circuit
make the adjustments for the second circuit on the
secondary controller.
• The intercom operation cannot be started if:
o The speaker is enabled (see "VOX & Speaker Operation"
page 32).
o The user turned VOX off.
• The display shows the symbol if:
o VOX is off.
The speaker is enabled.
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