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position the high sensitivity is selected
which permits you to hear the outer
marker tone about a mile from the
marker beacon transmitter. At this
point you may select the "LO SENS"
(middle) position to temporarily
silence the tone. It will start to sound
again when you are closer to the
marker, giving you a more precise
indication of its location. Many pilots
choose to leave the switch in the low
sensitivity position.
Holding the toggle switch in the
"TEST" position simply applies
voltage to all three marker lamps in
the unit and any external marker
lights. The "TEST" position is spring
loaded so that when the toggle switch
is released it returns to the "LO
SENS" position.
The photocell in the faceplate
automatically dims the marker lights
as well as the green annunciators in
the Audio Select Buttons for night
operation.
When marker audio is heard, the
pilot may momentarily push the
Marker Mute Button, if desired, to
silence the marker audio while the
aircraft is passing over this marker
beacon. The marker audio will
automatically be reset so that it will be
heard when passing over the next
marker beacon. The Marker Mute
Button has no effect on the Marker
Beacon Lamps.
Intercom
The KMA 26 contains a very versatile
built-in six station intercom. Intercom
operation is normally installed to be
voice activated (VOX), where the
intercom becomes active
automatically when a crew member or
passenger begins to speak. It may
optionally be installed for keyed
activation, where a separate
microphone switch must be keyed to
activate the intercom.
In order to set the proper VOX
sensitivity, momentarily press and
release the left inner knob when no
one is speaking into their
microphones. The VOX sensitivity
should be set if a background hissing
sound is heard in the headphones or
if intercom communications are
"clipped", i.e. the first syllable is lost
during intercom operation. The VOX
sensitivity may need to be reset when
there is a large change in the noise
level in the cockpit or cabin. The VOX
level should also be reset each time
power is applied to the KMA 26.
NOTE: To properly set the VOX
sensitivity make sure that no one is
speaking into the microphone. The
pilot may wish to put the intercom in
the "ALL" position to ensure that there
is no microphone activity before
momentarily pushing the left inner
knob. In addition, make sure that
none of the microphones are in a
position to pick up extraneous noise
such as wind noise from an open
window/vent or vibration from laying
on an instrument panel or against a
window. It is highly recommended that
any unused headsets be unplugged.
The intercom has three modes:
"ALL", "CREW", and "PILOT," which
are selected with the toggle switch on
the lower left side of the faceplate. In
the "ALL" position the pilot, copilot
and passengers are all on the same
intercom "loop" and everyone hears
the radios. In the "CREW" position the
pilot and copilot are on one intercom
loop and can hear the radios while the
passengers have their own dedicated
intercom and do not hear the radios.
KMA 26
3
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