Garmin Legacy Software Versions Guide de l'utilisateur télécharger pdf (Page 114)

190-00498-00 Rev. A

Garmin G1000 Pilot’s Guide for Cessna Nav III

5-6

AUDIO PANEL

SPEAKER

All of the radios can be heard over the cabin speaker.

Pressing the SPKR key selects and deselects the cabin

speaker. Speaker audio is muted when the PTT switch

is keyed.

The speaker volume is adjustable above and below

a nominal value. Contact a Garmin-authorized service

center for details.

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.

NOTE:

The GMA 1347 is capable of driving

external marker beacon lamps.

The receiver detects the three (3) marker tones, outer,

middle, and inner, and illuminates the appropriate marker

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 1300 Hz 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.

NOTE:

The marker beacon indicators operate

independently of the marker beacon audio

and cannot be turned off.

When the MKR/MUTE key is selected, the annunciator

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

marker 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.

The marker beacon audio output level is adjustable by

a Garmin-authorized service center.

Marker Beacon Signal Sensitivity

Press the HI SENS key (Figure 5-3) 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 Keys

MARKER BEACON VOLUME ADJUSTMENT

The level of marker beacon receiver audio can be

adjusted by a Garmin-authorized service center, if

desired.

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Garmin Legacy Software Versions Guide de l'utilisateur Page 114

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