TruTrak KRT2 Comm Radio IR - Manual (Page 31)

31
•
In
order
to
avoid
interference
the
distance
between
a
COM
an
NAV
antenna
or
between
a
COM
and
another
COM
antenna
should
be
as
large
as
possible.
A
distance
of
2
meters
normally
is
sufficient.
•
The
antenna
must
vertically
be
installed
as
far
as
possible
away
from
parts
like
propeller,
landing-­‐gear,
rudder
etc.,
that
may
influence
propagation
of
the
radio
signals.
•
In
gliders
the
internal
antenna
provided
by
the
airplane
manufacturer
is
to
be
used.
The
RF-­‐antenna
cable
may
not
be
part
of
other
cable
sets
like
power-­‐supply
or
microphone.
It
must
not
be
placed
together
with
any
other
COM,
NAV,
or
transponder
antenna
cable.
4.7
Microphone
General
The
correct
setting
of
the
MIC
and
VOX
values
is
of
great
importance
for
the
proper
function
of
the
Intercom
system
(see
3.4.3.
VOX
Intercom
Voice
Trigger
Level
and
3.4.10.
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
shall
not
be
triggered
by
normal
cockpit
noise.
When
there
is
extreme
cockpit
noise
or
there
are
uncompensated
microphones
VOX
can
be
deactivated
with
VOX=01
to
enable
manual
intercom
operation.
The
manual
intercom
operation
is
activated
with
one
or
two
separate,
parallel
connected,
optional
intercom
switches.
These
switches
are
not
the
PTT
switches.
The
intercom
switches
connect
pin
12
(intercom)
with
GND
(pin1-­‐and-­‐9).
An
e
will
be
indicated
if
pin
12
is
not
on
GND.
Communication
with
the
VOX
system
requires
pin
12
to
be
connected
to
GND
by
means
of
one
or
two
intercom
switches.
The
KRT2
unit
transmits
only
when
a
PTT
switch
is
pressed.
Cockpit
noise
suppression
is
only
possible
with
differential
microphones
used
in
modern
headsets.
Normal
Electret
microphones
are
not
suitable.