Operation and Installation Manual
KRT2 VHF-Communication Transceiver
Doc.-No: KRT2.A-MAN.en
Rev. 0101
Page
36
Because the 8V supply voltage is switched off when dynamic microphones are used during glider
flight the second (co-pilot) headset microphone is disabled.
A maximum of two microphones of same type may be connected to each microphone input channel.
Standard microphones have a large difference in power consumption; therefore different models must
not be mounted in parallel.
6.7.2 Speaker & open microphone:
An installation with open microphone together with a speaker and intercom is not possible.
Running a speaker together with an open microphone (goose neck) the Intercom operation hast to be
turned off by setting VOX=10 or opening the intercom switch (indicating “e”) otherwise a feedback
from the speaker will occur.
6.7.3 Earphone connection
Several earphones of same type can be connected in parallel. The total impedance should not be less
than 60 Ohms.
6.7.4 External audio input
Audio alarms can be made available via the external audio input. When this input is not used it must
be connected to ground in order to avoid noise. PIN5 must be connected to ground (GND).
6.7.5 Speaker connection
The high output power for the speaker requires a differential interconnection.
Obey:
This does not allow for one side of the speaker wires to be grounded. Both the wires have to
be installed fully insulated.
Special intention has to be paid off at gliders after retrofitting on older installations. Check with a me-
ter the resistance between one of the speaker wire and the case of KRT-2, it should be at high im-
pedance.
After turn on it will appear this warning on the screen in case the speaker is grounded.
Running under that condition may cause a defect.
