Garmin GMA 340 Manual

GMA 340

Audio Panel

pilot's guide

Front Panel Controls (GMA 340)

Front Panel Controls (GMA 340 Dual ADF)

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Front Panel Controls (GMA 340H)

Function Selection Switches

The left small knob (5,7) on all unis controls ON/OFF function.

MKR

BCN

l. MarkerBeaconlamps

7. Marker Beacon ReceiverAudio Select/Mute Button

3. Markr Beacon Receler Sensitruty Indicator LED's

4. Marker Beacon Receiver Sensitivrry Selection Button

5. hlot Intercom System (lCS) Volume (Also PassengerVolume on 340H)

6. hlot ICS Voice Activated (VOX) lntercom Squelch Level

7 , Copilot and Passenger ICS Volume Control (putt out for PassengerVolume)

B. Copilot and PasengerVOX lntercom Squelch Level

9. Crew Isolation lntercom Mode Button

10. hlot Isolation lntercom Mode Button

1 l. Passenger Addres (PA) Function Button

12. Speaker Function Button

rcs

13. TiansceiverAudio Selector Buttons (CCltvt l, COM 2, COM 3)

COM/ 14. Transmitter(AudioA4ic) SelectionButtons

NAV 15. Split COM Button (NotAvailable inDualADF)

16. Aircraft Radio Audio Selection Buttons (NAV l, NAV 2, D\4E, ADF l, ADF 2)

17 . AnnuncntorTestButton

lB. Locking ScrewAcces

19. Photocell-AutomaticAnnunciatorDimming

On. Off. and Failsafe Operation

The GMA 340 is powered off when the lelt smallknob (5, 7) is rotated frlly CCW into the detent.

To tum the unit on rotate the knob clockwrse past the click. The left small knobs also lunctions as the

pilot or copilot's ICS volume control on the appropriate unit. A failsafe circuit connects the pilot's headset

and microphone directly to COM I in case the power is intemrpted or the unit is tumed off.

Lighting

LED Button annunciator and markerbeacon lamp intensity are controlled automatica\by a bulhin

photocell on the front panel. Nomenclature backlighting is controlled by the aircraft dimmer buss.

Transceivers

Audio level is controlled by the selected C)M radio volume control.

SelectionofeitherCOM I,COM Z,orCON4 3(13)forbothMlCandaudiosourceisaccomplished

by pressrng either COM I N4lC, CON4 2 N4lC, or COM 3 MIC (14). The active com audio rs always heard

on theheadphones.

Additiona\ each audio source canbe selectedindependentlybypressrry COM 1, COM 2,or COM 3

(13) When selected in this way,they remain active as audio sources regardless olwhich transceiver has

been selected formicrophone use.

When a microphone is keyed, the active [ransceiver's MIC button LED blinks appro]omately once per

second to indicate that the radio is transmittlng.

Split COM (Not Available on Dual ADFI

Pressingthe CON{ l/2 button (15) actlates the Sp1lt COM function. When this mode is active,

COM I is dedicated sole1y to the pilot lor Ml0audio while COM 2 is dedicated to the copilot for MIO

audio. The pilot and copilot can srmuhaneously transmit in this mode over separate radios. Both pilots

can still listen to COM 3, NAV l, NAV 2, DI\4E, ADE and MKR as selected. The Split COM mode is

cancelled by pressrng the CON4 1/2 button a second time.

When rn the Split COM mode the copilot may make PA announcements whrle the pilot continues

usrry COM I independently When the PAbutton is pressed after the Split COM mode is activated, the

copilot's mic is output over the cabrn speaker when keyed. A second prcss of the PA button returns the

copilot to normal spht COM operation.

lf the C)M radios utilize a "transmit interlock" system, the Split C)M

function may require that this feature is enabled. Refer to the radio's

installation manual for guidance. GARMIN makes no expressed or implied

guarantees regarding the suitability of the Split C)M feature in a given

installation,

Com Swap Function

The GMA 340 allows the use of a remote mounted swrtch (typically on the yoke) to altemately

ftansfer the actn e microphone back and forth between COM I and COM 2. Pressrng the remote swrtch

will have no affect if COM 3 is the active transceiver. Ask your installing agency for details.

Aircraft Radios & Navigation

Audio level is controlted by the selected NAV radio volume control.

Pressing NAV l, NAV 2, DME, ADF l, ADF 2(16),or MKR (2) (see MKR Beacon Receiver, page B)

selects each audio source. A second button press deselecs the audio.

In addition, rhe GMA 340 provides inputs for an unswrtched aircraft radio (TEL RINGER) and an

unmuted, unswitched aircraft radro (ALTWRN).

Speaker Output

Pressing the SPKR button ( l2) selects aircraft radios over the cabin speaker. The speaker output is

muted when a COM microphone is keyed. The GMA 340 speaker output level can be adjusted by your

installing agenq{

PA Function

The PA mode is actwated by pressing the PA button ( I l). Then, when either the pilot's or copilot's

microphone is keyed, the conesponding mic audio is heard over the cabin speaker. If the SPKRbutton is

also actle, rhen any selected speaker audio is muted while the microphone is keyed. The SPKRbutton

does nothaveto be prer,,rously active in order to use the PA function. Pilot and copilot PA microphone

speaker levels are adjustable by your installing agency

Auxiliary Entertainment lnputs

The GMA 340 and340H provrde two stereo entertainment rnpus: MUSIC I and I\4USIC 2. The340

Dual ADF has only MUSIC l. MUSIC I is sofrmuted during all aircraft radio activtty and norma\

dunng ICS actrvrty MUSIC 2 is a non-muted input. These inpus are compatible with popular portable

entertainment der,rces such as cassette tape or CD players. The headphone outputs of these der,rces are

used ancl plugged into MUSIC I or MUS IC 2 . Two 3. 5 mm stereo phone jacks should be installed in a

convenient location for this purpose. MUSIC I and MUSIC zhave charactenstics that are allected by the

active rntercom mode. Refer to the table on page 7.

340H)

Inrercomvolume andsquelch (vox) are adjustedusingthe followingfrontpanel knobs:

o LEFT SMALT KNOB - Unit oN/oFF power control and Pilot lcs volume. Full

CCW DETENT Position is OFE

o LEFT LARGE KNOB - Pilot lcS mic VoX squelch level. cw rotation increases the

amounr of mic audio (VOX level) required to break squelch Full CCW is the "hot mic"

position.

o RIGIIT sMALt KNOB - lN position: Copilot ICS volume. ouT position:

Passenger ICS volume.

o RIGHT IIIRGE KNOB - Copilot and passenger mic VOX squelch level. CW

roration increases rhe amount of mic audio (VOX level) required to break squelch. Fully

CCW is the "HOT M lC" Position.

Each of the sixmicrophone inpushave dedicatedVOXcircuisensuringthat only the active

microphone(s) iJare heard when quelch is broken. This represents a vast rmplovement over the party-

line qrstems and reduces the amount of background noise in the headphones during cockpit communica-

tions Aftertheoperatorhasstoppedtalking,theintercomchannelremainsmomenUrilyopentoavoid

closure between words or normal pauses.

The GMA 340 prrtvides rhree intercom modes: Pllot GREW and ALL. The mode selection is

accomplished usrngthe PILOT and/or CREWbuttors.

Pressrng a mode button activates the corresponding ICS mode. Pressing again deactivates the mode'

Th.op.*toi.unswitch direcdyfromPILOTto CREWorfrom CREWto PllOTbypressrngtheother

rodebuuon. The ALL mode L active when neither PILOT nor CREW LED are lit. To switch from

PILOTtoCREWmode,prestheCREWbutton;fromCREWtoPILOIpressthePILOTbutton AnLED

ON indicates the isolationmode is active.

o PILOT moileisolates the pilot from everyone else and dedicates the aircraft radios to the

pilot exclusively The copilot and passengers share communication between themselves but

cannot communicate wrth the pilot or hear the aircraft radios.

o CkfJf moileplaces the pilot and copilot on a common ICS communication channel.

The passengers are on their own intercom channel and can communicate with each other, but

cannot communicate wrth the crew or hear the aircraft radios.

o ,4LLmade allows full intercom communication between everyone plugged in to the GMA

340. Aircraft radios are heard by all.

o MUSIC I andMUSIC2 stereo entertainment inputs are affected by the intercom mode

selected.

The following table summarizes the ICS operation for the different modes supportedby the

GMA34O:

MODE PILOT HEARS COPILOT HEARS PASSENGER

HEARS

MUSIC I MUTING

TRIGGERED BY

PILOT

(LED

LIT)

Selected Radios.

Pilot

Copilot.

Passengers.

MUSIC 1

Passengers.

Copilot.

MUSIC 1

Copilot or passenger

ICS activity,

CREW

(LED

LrT)

Selected Radios.

Pilot.

Copilot.

MUSIC 1

Selected Radios,

Copilot Pilot.

MUSIC 1

Passengers.

MUSIC 2.

(MUSIC 1 in Dual

ADF)

Aircraft radio activity.

MKR activity.

Pilot or Copilot ICS

activity.

ALL

LED,S

0FF)

Selected Radios.

Pilot.

Copilot.

Passengers.

MUSIC 1

Selected Radios.

Pilot.

Copilot.

Passengers.

MUSIC 1

Selected Radios.

Pilot,

Copilot.

Passengers.

MUSIC 1

Aircraft radio activity

MKR activity,

ICS activity.

MUSIC t is normally muted during ICS activity However an installation option is available to disable

ICSMUTE. ThenmutingofMUSlC lwillnotoccurduetolCSactMty Apanelmountedswitchmaybe

installed for this function. The MUSIC I mute trip 1evel is adjustable by the installing agency

Mono/Stereo Headset

The use of stereo headses is highlyrecommended.

lf monaural headsets are plugged into stereo jacks that do not have a switch

installed, the unit will not be damaged.

lf the pilot uses a monaural headset in a stereo jack, no audio will be heard

during failsafe operation. When using a monaural headset the pilot's jack must

be equipped with a stereo/mono switch and it must be set to the 'mono' position

for proper failsafe operation,

A penon listening on a monaural headset will hear only the left channel from the GMA 340 in both ean. If

a monaural headset isused at one o[thenassenserrnsitions. anvothernassenserlisteninson astereoheadset

Limited Warranty

GARMIN Corporation wanants this product to be free from defects in materia]s and worlcnarship for

one year from the date of purchase. GARMIN will, at its sole option, repair or replace any components

which fail in normal use. Such repairs or replacement will be made at no charge to the customer for parts

or labor. The customer rs, however, responsible for any fianspofiation costs. This wananty does not

cover failures due to abuse, misuse, accident or unauthorized alteration or repairs.

THEWARMNT'IESANDREMEDIES CONTAINED HEREINARE EXCLUSMAND IN UEU OFALL

OTHERWARMNTTES EXPRESSED OR IMPUED, INCLUDINGAM LIABIUTYARISING UNDER

WARMNTY OF MERCMNIABILITY OR FITNESS FORA PARNCULARPURrcSE, STAruTORY OR

OTHERWSE. THIS WARRANTY GNES YOU SPECIFIC LEGAL RIGHTS, WHICH MAYVARY FROM

STAIETOSTAIE.

IN NO EVENTSLIALLGARMIN BE L]ABLI FORAMINCIDENTAL, SPECIAL, INDIRECTOR

CONSEQUENT'IALDAMAGES,WHETHERRESULT'INGFROMTHEUSE,MISUSEORINABIUTYTO

USE THIS PRODUCTORFROMDEFECTS lN THEPRODUCT. SOME STAIES DO NOTALLOWTHE

EXCLUSIONS OF INCIDENTAL ORCONSEQUENTIAL DAMAGES, y) TTtrABO\E UMITANONS MAY

NOTAPPLYTOYOU.

To obtain wananty sewice, call the GARMIN Customer Service department (9131397 .8200) for a

retumedmerchandise trackingnumber. The unitshouldb securelypackagedwith the trackingnumber

clearlymarkedon the ouside of thepackage, andsentfreightprepaidandinsuredto a GARMINwananty

service station. A copy ofthe origrnal sales receipt is required as the proofofpurchase forwananty

repalrs. GARMIN retains the exclusive right to repalr or replace the unit or software or offer a fulIrefund

of the purchase price at lts sole discretlon. SUCH REMEDY SFIALL BE YOUR SOLE AND EXCLUSM

REMEDY FORAM BREACH OF WARRANTY.

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