Installation manual

User & Installation manual
VHF- Communication Transceiver
Doc.-Nr:
DE-3000-800100e
KRT2 & KRT 2A
Revision 4.0
30 of 45
5.6. Electrical Connections
The 15-pin D-Sub connector contains all electrical connections except the
antenna.
The battery plus connection must be protected with a
4-amps slow blow fuse !
5.6.1. Microphone-Connection
Both the L (left) and R (right) microphone input channels can either be
connected to standard microphones (standard signal level 1Vpp) or to
dynamic microphones (standard signal level 5mV to 10mV).
For standard microphones a supply voltage of 8V at 330
Ω is provided.
Elementary Electret microphones can also be connected. They have
considerably lower signal levels and therefore require an 8V supply
voltage.
The microphone input channel amplifier gain can be selected via the the
MIC-Setup menu 3.4.10.
When dynamic microphones are used in gliders the 8V supply voltage is
switched off for power saving purposes.
Standard microphones normally used in headsets together with dynamic
microphones generally can not be used at the same time.
Motor gliders should have a toggle switch installed to differentiate
between motor less flight with dynamic microphones and powered flight
with headsets.
When the AUTO mode is selected in the MIC-Setup menu the KRT2
automatically recognizes to which microphone type has been switched
and acts accordingly.