User & Installation manual
VHF- Communication Transceiver
Doc.-Nr.:
DE-3000-800100e
KRT2, KRT2M, KRT2RC
Revision 13.0
Jul. 2016
57 / 67
6.10 Microphone general
The correct setting of the MIC and VOX values is of great importance for
the Intercom system (see
“4.4.3 VOX – Intercom Voice Trigger Level
” and “4.4.11 MIC – Setup”).
The VOX intercom voice trigger level must be set to such a value that the
intercom system is activated when speaking at a normal voice level into
the microphone. It should be set so that it is not triggered by normal cockpit
noise.
In addition, VOX should be set to level 01 and the intercom switch
permanently enabled.
The manual intercom operation is possible with one or two separate,
optional parallel connected intercom switches. These switches are not the
PTT switches. The intercom switches connect pin12 (intercom) with GND
(pin1).
The intercom-
deactivation will be indicated with “e” if pin12 is not on GND.
The intercom requires the connection pin 12 to GND either permanently or
through the intercom switches.
Cockpit noise suppression is only possible with differential microphones
used in modern headsets. Normal Electret microphones are not suitable.