Pilot's Guide

Garmin G1000 Pilot’s Guide for Tiger AG-5B 190-00617-00 Rev. A
5-6
OPERATION
MARKER BEACON RECEIVER
Description and Operation
The audio panel marker beacon is used as part of the
ILS system. The marker beacon receiver is always ON and
receives at 75 MHz. The audio panel provides a marker
audio muting capability.
The receiver detects the three (3) marker tones,
outer,
middle and inner, and illuminates the appropriate mark-
er beacon indicators. The marker indicators are located
to the left of the Altimeter on the PFD (Figure 5-4). The
outer marker frequency is 400 Hz with a blue indicator,
the middle marker frequency is 1300Hz with an amber
indicator and the inner marker frequency is 3000 Hz with
a white indicator. Refer to Table 5-1 for a summary of the
marker beacon signal characteristics.
When the
MKR/MUTE key is selected, the annun-
ciator light illuminates and the audio signal can be heard
over the speaker or headsets during marker reception.
When the
MKR/MUTE key is annunciated and a mark-
er beacon tone is received, pressing the MKR/MUTE key
mutes the audio but does not affect the annunciators. The
audio returns when the next marker signal is received. If
the MKR/MUTE key is pressed during signal reception,
while marker beacon audio is muted, marker audio and
the MKR/MUTE key annunciator light are turned off.
NOTE: The marker beacon receiver indicators
operate independently of the marker beacon
audio and cannot be turned off.
The marker beacon audio output level is adjustable by
a Garmin-authorized service center.
NOTE: The GMA 1347 is capable of driving
external marker beacon lamps.
Marker Beacon Signal Sensitivity
The HI SENS key can be pressed for increased marker
beacon signal sensitivity. The HI SENS function is used
to receive an earlier indication of nearing a marker during
an approach.
Figure 5-3 Marker Beacon
MARKER BEACON VOLUME ADJUSTMENT
The level of marker beacon receiver audio can be ad-
justed by a Garmin-authorized service center, if desired.
190-00617-00_05A.indd 6 7/6/2005 3:16:33 PM