User & Installation manual
VHF- Communication Transceiver
Doc.-Nr:
DE-3000-800100e
KRT2
Revision 12.2
Jan. 2016
25 / 61
individually. The microphone signal level is dynamically displayed as bar
and as numeric value (from-0.00-to-1.00) in the line below.
The initial MIC-level should be 05, the engine should be running, use a
headset or earphone and speak at a normal voice level to fine-tune the
MIC-level. Whenever a new MIC-level is selected, the dynamic bar
indicator should then be at about 50%.
Special hint: At activation of MIC-Setup the present condition of speaker switch will
remain (SQU on/off). At speaker use a feet back can become active.
The range of the MIC-level for standard microphones is 01 to 09.
MIC levels 10 and 11 are special settings for low microphone levels like
dynamic micro-phones often used in gliders.
Those levels are valid for the left (L) input only.
10 is used for non-amplified Electret microphones with a 8 volt supply
voltage.
11 is for dynamic microphones only.
For high gain selection (> 9) the use of side tone can lead to a feed back at
transmission. In that case it should be set to SIT01.
When the microphone setup menu is terminated, the new value is stored.
To activate AUTO the menu should be terminated with this selection, else
leave in L or R position.
In the AUTO mode (up to Firmware version 6.16 every 30 sec. then at
transmission start) the left microphone impedance is measured. When a
dynamic microphone is recognized, the left channel is switch to 11, the
right channel is unaffected. When returning to the standard configuration,
the L and R values are restored.
A simultaneous operation on Electret and Dynamic
microphones is not possible, because there is just one DC
source for both ports. For dynamic mode this source must be
turned off automatically.
