190-01878-01 Rev. A
Garmin GMA 345 Pilot’s Guide
15
GMA 345 Audio Panel
MARKER BEACON RECEIVER
The marker beacon receiver detects any marker beacon signal within
the reception range of the aircraft.
When a marker beacon signal is detected, the lamps illuminate, and
an associated keyed-tone is heard when MKR audio is selected. Marker
beacon lamps operate independently of any audio selection and cannot
be turned off.
HI SENS Annunciator
Marker Beacon Key & Lamps
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
Audio Keying
Lamp Actuated
400 Hz
(Outer)
− − − − −
Blue
1300 Hz
(Middle)
−
−
−
−
−
Amber
3000 Hz
(Inner)
White
The GMA 345 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.
Summary of Contents for GMA 345
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