
Garmin G1000 Cockpit Reference Guide for Mooney M20M & M20R
38
SECTION 3 – AUDIO PANEL
3.3 MARKER BEACON RECEIVER
Description and Operation
The GMA 1347 provides a marker beacon receiver to
be used as part of an ILS approach. In addition to the
normal marker beacon receiver functions, the GMA 1347
provides an audio muting capability. The marker bea-
con receiver is always “ON” and receives at 75 MHz.
The receiver detects three (3) tones associated with the
outer, middle and inner approach markers, respectively,
and illuminates the appropriate marker beacon indica
-
tor lights located to the left of the Altimeter on the PFD.
The outer marker signal frequency is 400 Hz, and a blue
light indicates its reception. The middle marker signal
frequency is 1,300 Hz, and an amber light indicates its
reception. The inner marker signal frequency is 3,000
Hz, and a white light indicates its reception.
When the
MKR/MUTE key is selected, the
corresponding annunciator light becomes illuminated
and the audio signal can be heard over the headsets.
When the
MKR/MUTE key is annunciated and a
marker beacon tone is received, pressing the MKR/MUTE
key mutes the audio but does not affect the
corresponding
annunciator light. The audio returns when the next (dif-
ferent) marker signal is received. If the MKR/MUTE key
is pressed while the marker beacon audio is muted, the
marker audio becomes deactivated and the MKR/MUTE
annunciator light is turned off.
NOTE: The marker beacon receiver lights operate
independently of the marker beacon audio and
cannot be turned off.
The marker beacon audio level is aligned at the factory
to produce its rated audio output. Audio output level is
also adjustable in Configuration mode. Please consult a
Garmin-authorized service center for details.
NOTE: The unit provides output for driving
external marker beacon lamps and it provides
a middle marker sense output for use with an
autopilot.
Marker Beacon Signal Augmentation
The HI SENS key can be pressed to augment marker
beacon signal reception sensitivity. The HI SENS function
is typically used either over airway markers or to receive
an earlier indication of a nearing outer marker during an
approach.
The middle marker sense indicator provides input to
the autopilot.
The lamp and audio keying of the marker beacon re
-
ceiver are summarized in Table 3-1.
Figure 3-4 Marker Beacon
NOTE: The marker beacon signal sensitivity
threshold can be set in Configuration mode.
Please consult a Garmin-authorized service
center for details.
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