Operation and Installation Manual
KRT2 VHF-Communication Transceiver
Doc.-No: KRT2.A-MAN.en
Rev. 0101
Page
21
4.4.3 VOX – Intercom voice trigger level setting
Pressing the AUD button twice enables the turning knob to change the voice level which triggers the
intercom.
The intercom voice trigger level must be set to a value which prevents normal cockpit noise from be-
ing heard in the earphones. The intercom system should only be activated when talking at a normal
voice level into the microphone.
The higher the trigger level the louder the voice must be in order to trigger the intercom system.
VOX on condition is indicated by flag “v”.
VOXnn
Range: 01 – 10
The larger the value, the louder one must speak in order to activate the Inter-
com connection.
VOX on condition is indicated by flag “v”.
For installation with loudspeakers set VOX to 10 to switch it off.
4.4.4 Manual Intercom
With cockpit loud background noise or with uncompensated microphones the Intercom can be con-
trolled manually by using an external switch. Therefore the VOX system must be activated perma-
nently by selecting VOX: 01.
To turn off the Intercom the talk switch (default closed) must be opened, which will be indicated by “e”.
Deactivation of the intercom is done with an opened external microphone button (Ground connection
to pin 12), this is indicated with an “e” on the display.
This mode only works with a deactivated external audio input (see “4.4.7 EXT – External Audio Input
Volume”).
In gliders the VOX has to be set to 10 in order to disable the speaker control.
4.4.5 TXm – PTT switch selection
Pressing the AUD button three times enables the turning knob to enable certain PTT switches.
On transmission the microphone which is related to the PTT-L/R will be enabled. The equivalent indi-
cation is TX (TXm**), TX1 (TXm*-) TX2 (TXm-*).
On transmission the PTT-L/R related microphone will be the only one activated.
TXm** *
- Left / -
*
Right /
**
Both
