User & Installation manual
VHF- Communication Transceiver
Doc.-Nr:
DE-3000-800100e
KRT2
Revision 12.2
Jan. 2016
21 / 61
The Squelch setting is depending on several factors.
For engine driven airplanes an initial setting of 03-05 is recommended. For
gliders a setting of 2 is recommended. The lower the Squelch level value
the higher is the input sensitivity. A high sensitivity setting is susceptible to
noise from other sources like ignition strobe-lights etc. Increase the
number to suppress far stations.
Standard SQ-level is 05 ... 08. Higher setting will suppress
weaker input signals. 01 = Squelch off, 02 = for long range.
Squelch does not influence the intercom system.
3.4.3 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 such a value which
prevents that normal cockpit noise from being heard in the earphones. The
intercom system should only be activated when talking at a normal voice
level into the microphone.
The higher the value the louder one must speak in order to activate the
intercom system.
VOX on condition is indicated by flag “v”.
VOXnn
Range: 01 – 10
In gliders with active speaker use VOX=10 only.
3.4.4 Manual Intercom
With cockpit loud background noise or with uncompensated microphones
the Intercom can be controlled manually by using an external switch.
Therefore the VOX system must be activated permanently by selecting
VOX: 01.
To turn off the Intercom the talk switch (default closed) must be opened,
which will be indicated by “e”.
The manual Intercom turnoff only works by a deactivated external audio
input (see 3.4.7).
