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Transmitting
NOTE: Audio level of the COM radio(s) is con-
trolled by the COM volume controls located on
both the PFD and MFD (see the NAV/COM sec-
tion).
When a transmitter is keyed, the active transceiver
MIC key annunciator blinks approximately once per sec-
ond. A white TX indication appears next to the active
COM frequency on both the PFD and the MFD during
transmission.
PA FUNCTION
A passenger address function is provided by pressing
the PA key to deliver messages. Push-to-talk (PTT) must
be used to deliver PA announcements over the speaker .
When PA is selected on the audio panel, the annunciator
blinks about once per second, the COM MIC annunciator
is no longer lit, and the active COM frequency changes to
white, indicating that there is no COM selected.
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 cen-
ter for details.
190-00592-00 Rev. A
MARKER BEACON RECEIVER
Description and Operation
ILS system. The marker beacon receiver is always ON and
receives at 75 MHz. The audio panel provides a marker
audio muting capability.
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.
ciator light illuminates and the audio signal can be heard
over the speaker or headsets during marker reception.
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.
by a Garmin-authorized service center.
Garmin G1000 Pilot's Guide for the Diamond DA40
The audio panel marker beacon is used as part of the
The receiver detects the three marker tones – outer,
The marker beacon indicators operate
NOTE:
independently of the marker beacon audio
and cannot be turned off.
When the MKR/MUTE key is selected, the annun-
When the MKR/MUTE key is annunciated and a
The marker beacon audio volume level can be adjusted
AUDIO PANEL
5-5
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