Operating Instructions
Device Description
98 Transceiver Family 620X DV14307.03 Issue 04 March 2016
A voice communication test shall be performed before starting
the engine.
It should be noted that, if the communication test is carried out
close to a ground station, the results may be positive even if the
antenna cable is broken or short-circuited. In such a case, at a
distance of 5 to 10 km and above, communication might not be
possible.
• Speak always loud, clear and not too fast for optimal voice communication.
• Keep the microphone always close to the lips otherwise a special suppressing circuit in
the VHF COM will not be capable to suppress normal cabin noise.
• Use only microphones or headsets which are suitable for use in an aircraft.
o In aircraft made of wood, synthetic materials or in gliders or helicopters, incoming
radiation can affect the integrated amplifier of the microphone (feedback), noticeable in
the ground station by whistling and/or heavy distortion.
If the power supply voltage drops below the "Low Battery Threshold" (default value is 10.5 V), the
"LOW BATTERY" message will appear each 3 seconds in the lower part of the display.
If the power supply voltage drops below 10 V the system enters
power saving mode:
• Speaker output of the transceiver is automatically
switched "OFF"
• Speaker sign will no longer be presented on LCD
display
• The pilot must use headphones to continue listening.
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