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GMA 345 3-COM Audio Panel
The marker beacon signal sensitivity threshold can be set to either a
regular or high sensitivity. To toggle between the two, press and hold the
MKR/MUTE Key for one second. The HI SENS annunciator illuminates
when signal sensitivity is set to high.
The receiver detects the three marker tones (outer, middle, and inner).
Audio
Frequency
400 Hz
(Outer)
1300 Hz
(Middle)
3000 Hz
(Inner)
The GMA 345 3-COM provides three states of marker beacon operation;
On, Muted, and Deselected. The MKR/MUTE key annunciator indicates
when marker beacon audio is selected. Marker beacon audio is not
heard when the annunciator is off or when the annunciator is on with the
marker beacon audio muted.
T
M
urning
With the MKR/MUTE annunciator off, press the MKR/MUTE Key
to activate marker beacon audio and illuminate the MKR/MUTE
annunciator.
M
M
uTing
During marker beacon audio reception, press the MKR/MUTE Key
to mute the audio. The MKR/MUTE annunciator remains lit, but the
current marker tone is silenced. Audio muting deactivates automatically
and marker beacon audio is heard when the next marker beacon signal
is received.
16
Audio Keying
− − − − −
−−−−−
B
arker
eacon
B
a
arker
eacon
Garmin GMA 345 3-COM Pilot's Guide
a
o
udio
n
udio
Lamp Actuated
Blue
Amber
White
190-01878-05 Rev. A
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