Garmin GMA 350H Manual

GMA 350H
pilot’s guide

Copyright © 2011-2012 Garmin Ltd. or its subsidiaries. All rights reserved.
This manual reflects the operation of GMA 350H Audio Panel. Some differences
in operation may be observed when comparing the information in this manual to
some installations as configuration changes can be made by the installer.
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January, 2012 190-01134-14 Rev. C Printed in the U.S.A.

LIMITED WARRANTY
This Garmin product is warranted to be free from defects in materials or
workmanship for two years from the date of purchase. Within this period, Garmin
will, at its sole option, repair or replace any components that fail in normal use.
Such repairs or replacement will be made at no charge to the customer for parts
and labor, provided that the customer shall be responsible for any transportation
cost. This warranty does not cover failures due to abuse, misuse, accident, or
unauthorized alterations or repairs. In addition, Garmin reserves the right to
refuse warranty claims against products or services that are obtained and/or used
in contravention of the law of any country.
THE WARRANTIES AND REMEDIES CONTAINED HEREIN ARE EXCLUSIVE AND IN
LIEUOFALLOTHERWARRANTIESEXPRESSORIMPLIEDORSTATUTORY,INCLUDING
ANY LIABILITY ARISING UNDER ANY WARRANTY OF MERCHANTABILITY OR
FITNESS FOR A PARTICULAR PURPOSE, STATUTORY OR OTHERWISE. THIS
WARRANTY GIVES YOU SPECIFIC LEGAL RIGHTS, WHICH MAY VARY FROM STATE
TO STATE.
IN NO EVENT SHALL GARMIN BE LIABLE FORANY INCIDENTAL,SPECIAL,INDIRECT
OR CONSEQUENTIAL DAMAGES, WHETHER RESULTING FROM THE USE, MISUSE,
OR INABILITY TO USE THIS PRODUCT OR FROM DEFECTS IN THE PRODUCT. Some
states do not allow the exclusion of incidental or consequential damages, so the
above limitations may not apply to you.
Garmin retains the exclusive right to repair or replace the unit or software, or to
offer a full refund of the purchase price, at its sole discretion. SUCH REMEDY SHALL
BE YOUR SOLE AND EXCLUSIVE REMEDY FOR ANY BREACH OF WARRANTY.
To obtain warranty service, contact your local GarminAuthorized Service Center. For
assistance in locating a Service Center near you, visit the GarminWeb site at“http://
www.garmin.com” or contact Garmin Customer Service at 800-800-1020.
CAUTION: Incorrect aircraft wiring could short the left channel or
both channels to ground if a monaural headset is plugged into
the stereo jacks. If wired incorrectly, fail-safe operation will not
work.

Table of Contents
190-01134-14 Rev. C Garmin GMA 350H Pilot’s Guide i
Controls................................................................................................................1
Features and Operation...................................................................................... 4
Power-UP..............................................................................................................4
Mono/Stereo Headsets ....................................................................................... 5
Transceivers .........................................................................................................5
Enabling/Disabling Monitored COM Muting.............................................................5
Split-COM Mode .....................................................................................................5
Transmit Indications ................................................................................................6
Receivers..............................................................................................................7
Marker Beacon Receiver ..........................................................................................7
Intercom System (ICS) ........................................................................................9
Copilot Configured as Crew or Passenger ................................................................9
Intercom MODES...................................................................................................10
Intercom Volume and Squelch................................................................................14
Speaker.................................................................................................................17
3D Audio............................................................................................................. 18
Clearance Recorder and Player........................................................................ 20
Voice Recognition .............................................................................................21
Entertainment Inputs .......................................................................................27
Telephone and Entertainment Muting ....................................................................27
Fail-Safe Operation...........................................................................................28

Table of Contents
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Garmin GMA 350H Pilot’s Guide
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190-01134-14 Rev. C Garmin GMA 350H Pilot’s Guide 1
GMA 350H Audio Panel
CONTROLS
GMA 350H Controls
21
14 15 1712 1311 19 20 18
16
10
8642 3 5 7 9
1
NOTE: When a key is selected, a triangular annunciator above the key is
illuminated.
1
MKR/MUTE – Selects marker beacon receiver audio. Mutes the
currently received marker beacon receiver audio. Deactivates
automatically and marker beacon audio is heard when the next marker
beacon signal is received. Also, stops play of recorded COM audio.
2
COM1 – When selected, audio from the #1 COM receiver can be
heard. Press and hold to enable/disable monitored COM muting
during primary COM reception.
3
COM2 – When selected, audio from the #2 COM receiver can be
heard. Press and hold to enable/disable monitored COM muting
during primary COM reception.
4
COM3 – When selected, audio from the #3 COM receiver can be
heard. Press and hold to enable/disable monitored COM muting
during primary COM reception.

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GMA 350H Audio Panel
5
NAV1 – When selected, audio from the #1 NAV receiver can be heard.
6
AUX – When selected, audio from the AUX inputs can be heard.
7
– Selects and deselects audio from a telephone or entertainment
device connected to the Front Panel Jack. Audio from a telephone
device connected to the rear of the audio panel is used if a device is not
connected to the Front Panel Jack. Press and hold to enable/disable
muting during reception.
8
MUSIC – Selects and deselects music entertainment audio. Press and
hold to enable/disable MUSIC muting during reception.
9
MAN SQ – Manual Squelch annunciator. When lit, squelch is
controlled manually.
10
Volume Indicator – Indicates volume/squelch setting relative to full
scale.
11
Front Panel Jack – Used for an entertainment or telephone input.
12
MIC1 – Selects the #1 transmitter for transmitting. COM1 receive
is simultaneously selected when this key is pressed allowing received
audio from the #1 COM receiver to be heard. COM2 or COM3 receive
can be added by pressing the COM2 or COM3 Key. Selection of a
second MIC button initiates Split-COM mode (using COM1/COM2 or
COM1/COM3). When in Split-COM mode, the pilot is using the lower
numbered COM, the copilot is using the higher numbered COM.
13
MIC2 – Selects the #2 transmitter for transmitting. COM2 receive
is simultaneously selected when this key is pressed allowing received
audio from the #2 COM receiver to be heard. COM1 or COM3 receive
can be added by pressing the COM1 or COM3 Key. Selection of a
second MIC button initiates Split-COM mode (using COM1/COM2 or
COM2/COM3). When in Split-COM mode, the pilot is using the lower
numbered COM, the copilot is using the higher numbered COM.

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GMA 350H Audio Panel
14
MIC3 – Selects the #3 transmitter for transmitting. COM3 receive
is simultaneously selected when this key is pressed allowing received
audio from the #3 COM receiver to be heard. COM1 or COM2 receive
can be added by pressing the COM1 or COM2 Key. Selection of a
second MIC button initiates Split-COM mode (using COM1/COM3 or
COM2/COM3). When in Split-COM mode, the pilot is using the lower
numbered COM, the copilot is using the higher numbered COM.
15
NAV2 – When selected, audio from the #2 NAV receiver can be heard.
16
PILOT – Controls the pilot intercom system. Press and hold to toggle
3D audio on/off for all headset positions.
17
COPLT – Controls the copilot intercom system. Press and hold to
toggle copilot configuration between crew and passenger.
18
PASS – Controls the passenger intercom system. Press and hold to
enable/disable passenger muting during reception.
19
SPKR – Selects and deselects the cabin speaker. COM, NAV, AUX, and
MKR receiver audio can be heard on the speaker. Press and hold for 2
seconds for Passenger Address (PA). The SPKR key flashes during PA.
20
Cursor (CRSR) Control Knob – Turn to move the cursor (flashing
green or blue annunciator) to the desired source.
21
Volume (VOL) Control Knob – Turn the smaller knob to control
volume or squelch of the selected source (indicated by the flashing
green or blue annunciator). When the volume control cursor is not
active press to switch to Blue-Select mode. If the volume control cursor
is active, press twice (once to cancel the cursor, twice to activate Blue-
Select mode).

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GMA 350H Audio Panel
FEATURES AND OPERATION
The GMA 350H Audio Panel provides the traditional audio selector functions
of microphone and receiver audio selection. The Audio Panel includes an
intercom system (ICS), a marker beacon receiver, and a COM clearance
recorder. Ambient noise from the aircraft radios is reduced by Avionics
Squelch (ASQ). When no audio is detected, ASQ processing further reduces
the amount of background noise. The MAN SQ Key toggles between manual
and automatic intercom system (ICS) squelch. In automatic ICS squelch
mode, threshold adjustments are handled automatically by the system. In
manual ICS squelch mode, individual threshold adjustments can be made
for the pilot, copilot, and passenger microphones by the crew. The ability to
adjust individual thresholds for each ICS position further reduces the amount
of background noise from the radios.
Pushbutton keys control audio selection. When a key is selected, a triangular
annunciator above the key is illuminated. Annunciator brightness is adjusted
automatically by photocell dimming. Key brightness is adjusted by the radio
dimming bus control. Three Aux inputs are available for additional avionics
or audio devices.
Upon installation, the unit may be configured in various ways depending
on aircraft type and the needs of the pilot.
POWER-UP
The GMA 350H performs a self-test during power-up. During the self-
test all Audio Panel annunciator lights illuminate for approximately two
seconds. Once the self-test is completed, most of the settings are restored
to those in use before the unit was last turned off.

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GMA 350H Audio Panel
MONO/STEREO HEADSETS
Stereo headsets are recommended when using the GMA 350H. Using a
monaural headset in a stereo jack shorts the right headset channel output to
ground. While this does not damage the Audio Panel, a person listening on
a monaural headset hears only the left channel in both ears. If a monaural
headset is used at one of the passenger positions, any other passenger using
a stereo headset hears audio in the left ear only.
TRANSCEIVERS
NOTE: Transceiver functions may also be accessed via Voice Recognition
commands. Refer to theVoice Recognition section for more information.
Audio from the #1, #2, or #3 COM receiver can be selected independently
by pressing the respective Key(s) (COM1, COM2, or COM3).
Pressing MIC1, MIC2, or MIC3 selects the #1, #2, or #3 transmitter and
simultaneously selects the related COM receiver (COM1, COM2, or COM3)
allowing received audio to be heard. The remaining COM receivers can be
added by pressing their respective keys. During reception of audio from the
COM radio selected for transmission, audio from the other COM radio(s)
are muted.
ENABLING/DISABLING MONITORED COM MUTING
Press and hold COM1, COM2, or COM3 to enable/disable monitored
COM muting during reception of audio from the COM radio selected for
transmission. The aural message “Mute Monitored COM on Primary
COM Reception Enabled/Disabled” is heard.
SPLIT-COM MODE
NOTE: Split COM performance is affected by the distance between
the COM antennas and the separation of the tuned frequencies. If the
selected COM frequencies are too close together, interference may be
heard during transmission on the other radio.

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GMA 350H Audio Panel
During Split-COM operation, both the pilot and the copilot can transmit
simultaneously over separate radios.
Pressing more than one MIC Keys simultaneously initiates Split-COM
Mode (i.e., COM1/COM2, COM1/COM3, or COM2/COM3). The
respective COM1/MIC1, COM2/MIC2, or COM3/MIC3 annunciators
are illuminated indicating Split-COM operation. Split-COM operation is
cancelled by pressing one of the selected MIC Keys again.
When in Split-COM mode, the pilot is using the lower numbered COM,
the copilot is using the higher numbered COM.
COM2 Radio is Selected
Selecting a COM Radio for Transmit
TRANSMIT INDICATIONS
During COM transmission, the active transceiver (MIC1, MIC2, or
MIC3) Key Annunciator flashes approximately once per second.
During Split-COM transmission, the MIC1 or MIC2 annunciator
flashes when the pilot’s microphone PTT is pressed. The MIC2 or MIC3
annunciator flashes when the copilot’s microphone PTT is pressed.
COM Radio Transmit Indication
Annunciator
Flashes During
Transmission

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GMA 350H Audio Panel
RECEIVERS
NOTE: Receiver functions may also be accessed via Voice Recognition
commands. Refer to theVoice Recognition section for more information.
Pressing the NAV1 and/or NAV2 Key(s) selects/deselects the receiver
audio for the corresponding navigation radio source. The selected audio
source can be heard over the headset and the speaker (if selected). All
radios can be selected individually or simultaneously.
Selecting a NAV Radio Receiver
MARKER BEACON RECEIVER
The marker beacon receiver detects any marker beacon signal within
the reception range of the aircraft.
The GMA 350H has the ability to drive optional external marker lamps.
Marker beacon lamps operate independently of any audio selection and
cannot be turned off.
The marker beacon signal sensitivity threshold can be set to High, Low,
or User Selectable (toggle switch required).
The receiver detects the three marker tones (outer, middle, and inner).
Audio Frequency Audio Keying Lamp Actuated
(optional)
400 Hz
(Outer) − − − − − Blue
1300 Hz
(Middle) −−−−−Amber
3000 Hz
(Inner)  White

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GMA 350H Audio Panel
The GMA 350H 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.
Turning Marker Beacon audio on
With the MKR/MUTE annunciator off, press the MKR/MUTE Key to
enable marker beacon audio.
MuTing Marker Beacon audio
During marker beacon audio reception, press the MKR/MUTE Key
to mute the audio. The MKR/MUTE annunciator remains lit, but the
current marker tone is silenced. Audio muting deactivates automatically
and marker beacon audio is heard when the next marker beacon signal
is received.
deselecTing Marker Beacon audio
To deselect marker beacon audio, press the MKR/MUTE Key twice
during marker beacon reception or once if a marker beacon signal is
not detected.
Marker Beacon Key

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GMA 350H Audio Panel
INTERCOM SYSTEM (ICS)
NOTE: Intercom functions may also be accessed via Voice Recognition
commands. Refer to theVoice Recognition section for more information.
The GMA 350H includes a six-position intercom system (ICS), one
MUSIC input, and one telephone/entertainment input for the pilot, copilot
and passengers. The intercom provides Pilot, Copilot, and Passenger audio
isolation.
Intercom Controls
Press the PILOT, COPLT, and/or PASS Keys to distribute as required.
If the annunciators are lit, those positions will share intercom audio. If an
annunciator is NOT lit that position is isolated from the others.
COPILOT CONFIGURED AS CREW OR PASSENGER
NOTE: When the copilot position is configured as a passenger, the COPLT
Key is disabled and the copilot headset is treated as a ‘passenger’ for
intercom and entertainment audio distribution.
The copilot position can be configured as crew (COPLT Key enabled)
or as a passenger (COPLT Key disabled). Pressing and holding the
COPLT Key toggles the copilot position configuration between passenger
and crew. The aural message “Copilot Configured as Passenger” or
“Copilot Configured as Crew” is heard.

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GMA 350H Audio Panel
INTERCOM MODES
NOTE: In the following modes the copilot position is configured as crew.
NOTE: In the default ICS configuration, only the pilot and copilot
positions can hear aircraft alerts.
all inTercoM Mode
In ‘All Intercom’ mode the Pilot, Copilot, and Passengers hear each
other and hear the aircraft audio.
ICS Keys Mode Operation
Aircraft Audio
PASS
PILOT COPLT

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GMA 350H Audio Panel
PiloT isolaTe Mode
In ‘Pilot Isolate’ mode the Pilot, Copilot, and Passengers hear the
aircraft audio. The Copilot and Passengers also hear each other.
ICS Keys Mode Operation
Aircraft Audio
PASS
PILOT COPLT
Passenger/crew isolaTe Mode
In ‘Passenger/Crew Isolate’ mode the Pilot and Copilot hear the
aircraft audio and each other. The Passengers hear each other.
ICS Keys Mode Operation
Aircraft Audio
COPLTPILOT PASS

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GMA 350H Audio Panel
coPiloT isolaTe Mode
In ‘Copilot Isolate’ mode the Pilot and Passengers hear the aircraft
audio and each other. The Copilot has the option to use Split-COM
mode.
ICS Keys Mode Operation
Aircraft Audio
PASS
PILOT
COPLT
Split-COM Mode
(Optional)
all isolaTe Mode
In ‘All Isolate’ mode the Pilot hears the aircraft audio. The Copilot
has the option to use Split-COM mode. The Passengers hear each other.
ICS Keys Mode Operation
Aircraft Audio
COPLTPILOT PASS
Split-COM
(Optional)

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GMA 350H Audio Panel
PiloT & coPiloT isolaTe Mode
In ‘Pilot & Copilot Isolate’ mode the Pilot and Passengers hear the
aircraft audio. The Copilot has the option to use Split-COM mode.
ICS Keys Mode Operation
Aircraft Audio
PASS
PILOT COPLT
Split-COM
(Optional)
PiloT & Passenger isolaTe Mode
In ‘Pilot & Passenger Isolate’ mode the Pilot and Copilot hear the
aircraft audio. The Passengers hear each other.
ICS Keys Mode Operation
Aircraft Audio
COPLT
PILOT PASS

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GMA 350H Audio Panel
coPiloT & Passenger isolaTe Mode
In ‘Copilot & Passenger Isolate’ mode the Pilot can hear the aircraft
audio. The Copilot has the option to use Split-COM mode. The
Passengers hear each other.
ICS Keys Mode Operation
Aircraft Audio
COPLT
PILOT PASS
Split-COM
(Optional)
INTERCOM VOLUME AND SQUELCH
The VOL/CRSR Knob controls selection and volume or manual squelch
adjustment for audio sources that may not be adjustable anywhere else in
the system. The small knob controls the volume or squelch. Turning the
large knob activates and/or moves the cursor (flashing green annunciator/
or flashing blue annunciator in Blue-Select Mode) to select the audio
source to adjust. The cursor will time-out after a few seconds and the
position of the cursor will always default back to the PILOT Key. Pressing
the small knob cancels the cursor.
Blue-selecT Mode (TelePhone/enTerTainMenT
disTriBuTion)
The music (MUSIC) and telephone/entertainment ( ) audio
are distributed using the Blue-Select Mode. The following example
indicates that the pilot, copilot, and passengers will all hear the
telephone/entertainment audio.
Blue-Select Mode (Telephone/Entertainment Distribution)
The Blue-Select Mode is entered by pressing the small knob when the
volume control cursor (flashing green annunciator) is not active. If the
volume control cursor is active, press the small knob twice. The first
press will cancel the volume control cursor, the second will activate
Blue-Select Mode.
The annunciator over the Key will be flashing blue. Any
combination of the annunciators over the PILOT, COPLT, and
PASS buttons may be blue. Select the desired button to turn the blue
annunciator on or off to distribute the telephone audio to selected crew/
passenger positions. Turn the large knob to select MUSIC, and select
the crew positions to receive the music audio.
Selecting any key other than PILOT, COPLT, PASS, MUSIC, or
will cancel Blue-Select Mode. Pressing the small knob will also
cancel Blue-Select Mode. After approximately ten seconds with no
input, the Blue-Select Mode will automatically cancel.