4.6.1 Two PTT configuration
There are two different PTT assigned for each of the left and right side microphones. This enables the
deactivation of the unused one preventing additional noise and unintentional talking on transmission.
In case there is just one PTT and multiple headsets in use both the PTT-L and PTT-R must be tied
together, see chapter “4.4.5 TXm – PTT Switch Selection”.
4.6.2 Self-Test monitor
Software diagnostics operate continuously in the background in order to test the system.
The field for battery status & error (see Control Elements Overview) is used to display warnings and in
case of hardware failure, different error reports will be displayed here.
The warnings are:
BAT Low battery voltage (becomes active < 10,5V)
At transmission
A-match Bad antenna match or defective antenna.
Also while transmitting the TX-flag (left top) will change to:
Te if transmission time has exceeded (> 2 minutes).
All other reports starting with Er_…. Indicating a major hardware failure and consequently the radio
has to be returned to the factory.
4.6.3 Optical side tone
Especially when used in gliders, where headsets are generally not worn and thus no side tone is
heard, it is very helpful to see if the microphone is operating properly.
At left lower side, there is a modulation indicator that depicts the voice level. When there is no modu-
lation it becomes a small dot approximately in the centre.
Also if it lays far off centre, it indicates that there is bad antenna matching.
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