Garmin GMA 245, GMA 245R Installation manual

GMA 245/245R

Installation Manual

190-01879-11

March, 2018

Revision 7

© 2018

Garmin Ltd. or its subsidiaries All Rights Reserved

Except as expressly provided herein, no part of this manual may be reproduced, copied, transmitted, disseminated, downloaded or stored in any storage medium, for any purpose without the express prior written consent of Garmin. Garmin hereby grants permission to download a single copy of this manual and of any revision to this manual onto a hard drive or other electronic storage medium to be viewed and to print one copy of this manual or of any revision hereto, provided that such electronic or printed copy of this manual or revision must contain the complete text of this copyright notice and provided further that any unauthorized commercial distribution of this manual or any revision hereto is strictly prohibited.

Garmin International, Inc.

1200 E. 151st Street

Olathe, KS 66062 USA

Aviation Panel-Mount Technical Support Line (Toll Free) 1.888.606.5482

Garmin (Europe) Ltd.

Liberty House, Hounsdown Business Park

Southampton, Hampshire SO40 9LR U.K.

Garmin aviation support and warranty information can be found at www.flygarmin.com.

		RECORD OF REVISIONS
Revision	Revision Date	Description
2	03/18/16	Updated bracket names
3	06/06/16	Added Bluetooth install guidance
4	08/22/16	Added Disabling Bluetooth info
5	02/06/17	Updated lighting bus info
6	08/21/17	Updated Transmitter Grant of Equipment Authorization info
7	03/09/18	Updated Post Installation Checkout Procedure

190-01879-11	GMA 245/245R Installation Manual
Rev. 7	Page A

CURRENT REVISION DESCRIPTION

	Revision	Page	Section	Description of Change
		Number	Number
		ii	Front Section	Added Software License Agreement
		2-3	2.3.2	Updated insulating washer list
		2-9	2.9.6	Updated Front Panel Configuration info in Figure 2-3
	7	3-19,	3.7	Updated and removed sections of the Post Installation
		3-20		Checkout procedure
		B-6	Appdx B	Added panel cutout drawing Figure B-6
		C-2, C-3,	Appdx C	Updated Figures C-2, C-3, C-5, and C-6
		C-5, C-6

INFORMATION SUBJECT TO EXPORT CONTROL LAWS

This document may contain information which is subject to the Export Administration Regulations ("EAR") issued by the United States Department of Commerce (15 CFR, Chapter VII, Subchapter C) and which may not be exported, released, or disclosed to foreign nationals inside or outside of the United States without first obtaining an export license. The preceding statement is required to be included on any and all reproductions in whole or in part of this manual.

190-01879-11	GMA 245/245R Installation Manual
Rev. 7	Page i

DEFINITIONS OF WARNINGS, CAUTIONS, AND NOTES

WARNING

This product, its packaging, and its components contain chemicals known to the State of California to cause cancer, birth defects, or reproductive harm. This Notice is being provided in accordance with California's Proposition 65. If you have any questions or would like additional information, please refer to our web site at www.garmin.com/prop65.

NOTE

Throughout this document, the use of GMA 245 refers to both the GMA 245 and the GMA 245R unless specifically noted otherwise.

NOTE

The Bluetooth® word mark and logos are registered trademarks owned by Bluetooth SIG, Inc. and any use of such marks by Garmin is under license.

SOFTWARE LICENSE AGREEMENT

BY USING THE DEVICE, COMPONENT OR SYSTEM MANUFACTURED OR SOLD BY GARMIN (“THE GARMIN PRODUCT”), YOU AGREE TO BE BOUND BY THE TERMS AND CONDITIONS OF THE FOLLOWING SOFTWARE LICENSE AGREEMENT. PLEASE READ THIS AGREEMENT CAREFULLY. Garmin Ltd. and its subsidiaries (“Garmin”) grants you a limited license to use the software embedded in the Garmin Product (the “Software”) in binary executable form in the normal operation of the Garmin Product. Title, ownership rights, and intellectual property rights in and to the Software remain with Garmin and/or its third-party providers. You acknowledge that the Software is the property of Garmin and/or its third-party providers and is protected under the United States of America copyright laws and international copyright treaties. You further acknowledge that the structure, organization, and code of the Software are valuable trade secrets of Garmin and/or its third-party providers and that the Software in source code form remains a valuable trade secret of Garmin and/or its third-party providers. You agree not to reproduce, decompile, disassemble, modify, reverse assemble, reverse engineer, or reduce to human readable form the Software or any part thereof or create any derivative works based on the Software. You agree not to export or re-export the Software to any country in violation of the export control laws of the United States of America.

190-01879-11	GMA 245/245R Installation Manual
Rev. 7	Page ii

Transmitter Grant of Equipment Authorization

1. FCC

Contains FCC ID: QOQWT32I

NOTE

This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions:

(1) this device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.

FCC RF Radiation Exposure Statement:

This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment. End users must follow the specific operating instructions for satisfying RF exposure compliance. This transmitter meets both portable and mobile limits as demonstrated in the RF Exposure Analysis. This transmitter must not be co-located or operating in conjunction with any other antenna or transmitter except in accordance with FCC multi-transmitter product procedures.

2. IC

Contains IC: 5123A-BGTWT32I

NOTE

This device complies with Innovation, Science and Economic Development Canada license-exempt RSS standard(s). Operation is subject to the following two conditions: (1) this device may not cause interference, and (2) this device must accept any interference, including interference that may cause undesired operation of the device.

Cet appareil est conforme aux normes RSS sans licence du ministére Innovation, Sciences et Développement économique Canada. Son fonctionnement est soumis aux deux conditions suivantes :

(1) ce périphérique ne doit pas causer d’interférences et (2) doit accepter toute interférence, y compris les interférences pouvant entraîner un fonctionnement indésirable de l’appareil.

3. Declaration of Conformity

Hereby, Garmin declares that this product is in compliance with the Directive 2014/53/EU. The full text of the EU declaration of conformity is available at the following internet address: www.garmin.com/compliance.

Radio frequency/protocol: Bluetooth® wireless technology 2.4 GHz @ -0.49 dBm nominal

190-01879-11	GMA 245/245R Installation Manual
Rev. 7	Page iii

TABLE OF CONTENTS

PARAGRAPH PAGE

Section 1 General Description ...........................................................................		1-1
1.1	Introduction......................................................................................................................	1-1
1.2	Equipment Description ....................................................................................................	1-1
1.3	Technical Specifications ..................................................................................................	1-2
1.4	Reference Documents ......................................................................................................	1-6

Section 2 Installation Overview.........................................................................			2-1
2.1	Introduction......................................................................................................................		2-1
2.2	Installation Materials .......................................................................................................		2-1
2.3	Available Accessories......................................................................................................		2-1
2.4	Installation Considerations ..............................................................................................		2-4
2.5 GMA 245R Status LED...................................................................................................			2-4
2.6	GMA 245R Installation Guidance for Best Bluetooth Performance ...............................		2-4
2.7	Cabling and Wiring..........................................................................................................		2-5
2.8	Cooling Air ......................................................................................................................		2-5
2.9	Configuration, and Adjustment Options..........................................................................		2-6
2.10		Updating Software .......................................................................................................	2-11
2.11		Noise ............................................................................................................................	2-12
2.12		Mounting Requirements ..............................................................................................	2-13

Section 3 Installation Procedure........................................................................		3-1
3.1	Unpacking Unit................................................................................................................	3-1
3.2	Electrical Connections .....................................................................................................	3-1
3.3	Jackscrew and Shield Block Backshell Installation Instructions.....................................	3-2
3.4	Backshell Assembly.......................................................................................................	3-17
3.5	Audio Shield Termination .............................................................................................	3-17
3.6	Unit Installation .............................................................................................................	3-18
3.7	Post Installation Checkout .............................................................................................	3-19
3.8	Continued Airworthiness ...............................................................................................	3-20
3.9	Diagnostics Information ................................................................................................	3-21
3.10 Disabling Bluetooth .....................................................................................................		3-21

Section 4 System Interconnects .........................................................................		4-1
4.1	Connector Description .....................................................................................................	4-1
4.2	Pin List.............................................................................................................................	4-1
4.3	Aircraft Power..................................................................................................................	4-4
4.4 CAN Bus..........................................................................................................................		4-4
4.5	Lighting Bus ....................................................................................................................	4-5
4.6	Audio Inputs/Outputs and Mic Keys ...............................................................................	4-6
4.7	Discrete Inputs ...............................................................................................................	4-10

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Rev. 7	Page iv

PARAGRAPH PAGE

Section A Installation Considerations for Upgrading from a Garmin
	GMA 240 ............................................................................................	A-1
A.1	Mechanical Considerations............................................................................................	A-1
A.2	Electrical Considerations ...............................................................................................	A-1
A.3 GMA 240 to GMA 245 Retrofit Connections ...............................................................		A-2
Appendix B Outline and Installation Drawings .............................................		B-1
Appendix C Interconnect Drawings.................................................................		C-1

190-01879-11	GMA 245/245R Installation Manual
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LIST OF FIGURES

FIGURE			PAGE
Section 1	General Description ...........................................................................		1-1
Section 2	Installation Overview.........................................................................		2-1
Figure 2-1 GMA 245R Bluetooth Transceiver Location......................................................			2-4
Figure 2-2 SD Card Slot and DIP Switch Locations ............................................................			2-7
Figure 2-3		Front Panel Configuration...................................................................................	2-9
Figure 2-4 GMA 245 Unit Rack (115-00262-00)...............................................................			2-13
Figure 2-5 GMA 245R w/Mounting Brackets on Front and Back .....................................			2-14
Figure 2-6 GMA 245R w/Mounting Brackets on Sides .....................................................			2-14
Section 3	Installation Procedure........................................................................		3-1
Figure 3-1 GMA 245R Jackscrew Backshell Assembly ......................................................			3-4
Figure 3-2 GMA 245 Shield Block Backshell Assembly.....................................................			3-5
Figure 3-3 Method A.1 for Shield Termination...................................................................			3-6
Figure 3-4		Insulation/Contact Clearance .............................................................................	3-8
Figure 3-5 Method A.2 (Daisy Chain) for Shield Termination .........................................			3-10
Figure 3-6 Method B.1 (Quick Term) for Shield Termination..........................................			3-12
Figure 3-7 Method B.2 (Daisy Chain-Quick Term) for Shield Termination......................			3-13
Figure 3-8 Daisy Chain between Methods A and B ..........................................................			3-14
Figure 3-9		Jackscrew D-Sub Spliced Signal Wire illustration ...........................................	3-15
Figure 3-10		Shield Block D-Sub Spliced Signal Wire illustration.....................................	3-16
Figure 3-11 Rear View of Rack and Connectors................................................................			3-17
Figure 3-12 GMA 245 Audio Shield Termination (top and bottom) .................................			3-17
Figure 3-13 GMA 245R Audio Shield Termination (top and bottom)...............................			3-18
Figure 3-14 Diagnostics Mode ...........................................................................................			3-21
Section 4	System Interconnects .........................................................................		4-1
Figure 4-1 Rear View of Backplate and Connectors ............................................................			4-1
Figure 4-2 Rear Connectors J2401 & J2402, Viewed from Back of Unit............................			4-1
Section A Installation Considerations for Upgrading from a Garmin
	GMA 240 ............................................................................................		A-1
Figure A-1 GMA 240 to GMA 245 Retrofit Connections...................................................			A-2
Appendix B Outline and Installation Drawings .............................................			B-1
Figure B-1 GMA 245 Outline Drawing................................................................................			B-1
Figure B-2 GMA 245 Installation Drawing..........................................................................			B-2
Figure B-3 GMA 245R Outline Drawing, End Mount Bracket Installation .......................			B-3
Figure B-4 GMA 245R Outline Drawing, Side Mount Bracket Installation........................			B-4
Figure B-5 GMA 245R Installation Drawing, End and Side Bracket Mounting .................			B-5
Figure B-6 GMA 245 Panel Cutout Drawing.......................................................................			B-6

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Rev. 7	Page vi

FIGURE PAGE

Appendix C	Interconnect Drawings ................................................................		C-1
Figure C-1 Notes for Example Interconnect Drawings ........................................................			C-1
Figure C-2 J2401		Connector Example Interconnect Drawing..............................................	C-2
Figure C-3 J2402		Connector Example Interconnect Drawing..............................................	C-3
Figure C-4	Lighting Bus Example Interconnect Drawing....................................................		C-4
Figure C-5	Mono Audio Example Interconnect Drawing ....................................................		C-5
Figure C-6	Four Passenger Headset Wiring Example Interconnect Drawing ......................		C-6
Figure C-7	J2401	& J2402 Connector Layout Drawing.......................................................	C-7

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Rev. 7	Page vii

LIST OF TABLES

TABLE PAGE

Section 1 General Description ...........................................................................		1-1
Table 1-1	Physical Characteristics GMA 245 ......................................................................	1-2
Table 1-3	Electrical Characteristics......................................................................................	1-3
Table 1-2 Physical Characteristics GMA 245R....................................................................		1-3
Table 1-4 Speaker Output .....................................................................................................		1-4
Table 1-5 GMA 245/245R Power Requirements .................................................................		1-5
Table 1-6 GMA 245 Power Requirements ...........................................................................		1-5
Table 1-7	GMA 245R Power Requirements.........................................................................	1-5
Table 1-8	Reference Documents...........................................................................................	1-6

Section 2 Installation Overview.........................................................................			2-1
Table 2-1 Catalog Part Numbers		..........................................................................................	2-1
Table 2 - 2	Contents of GMA 245	Standard Installation Kit ..................................................	2-1
Table 2-3	Contents of GMA 245R ..................................................................Standard Kit		2-1
Table 2-5	Contents of GMA 245 ...	Conn Kit (011 - 02302 - 00, also used for GMA 35/350)	2-2
Table 2-6	Contents of GMA 245 .................................	Ring Terminal Kit (011 - 04151 - 00)	2-2
Table 2-7	Contents of GMA 245 .........................	Pre - bagged Screws “D” (011 - 02650 - 03)	2-2
Table 2 - 8	Contents of GMA 245R .............................................Conn Kit (011-03828-00)		2-2
Table 2 - 4	Contents of GMA 245	Back Plate Kit (011 - 00678 - 00, also used for
GMA 240/340).......................................................................................................................			2-2
Table 2 - 9	Status LED Indications.........................................................................................		2-4
Table 2 - 10	GMA 245 DIP Switch ...................................................Configuration Settings		2-7
Table 2 - 11	GMA 245R DIP Switch ................................................Configuration Settings		2-8
Table 2 - 12	Hardwire Configuration ......................................................................Options		2-10

Section 3 Installation Procedure........................................................................		3-1
Table 3-1 Pin Contact Part Numbers ....................................................................................		3-1
Table 3-3	Parts supplied for a GMA 245R Jackscrew Backshell Installation (Figure 3-1) . 3-2
Table 3-2 Recommended Crimp Tools.................................................................................		3-2
Table 3-4	Parts supplied for a GMA 245 Backshell Installation (Figure 3-2) .....................	3-3
Table 3-5	Parts not supplied for a Backshell Installation (Figure 3-1).................................	3-3
Table 3-6	Shielded Cable Preparations for Garmin Connectors...........................................	3-6
Table 3-7	Shielded Cable Preparations – (Quick Term).....................................................	3-12

Section 4 System Interconnects .........................................................................			4-1
Table 4-1 J2401		Pin Assignments ........................................................................................	4-1
Table 4-2	J2402	Pin Assignments ........................................................................................	4-3
Table 4-3	Aircraft Power ......................................................................................................		4-4
Table 4-4	CAN Bus ..............................................................................................................		4-4
Table 4-5	Lighting Bus .........................................................................................................		4-5

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TABLE		PAGE
Table 4-6	Mic Audio Inputs and Mic Keys	.......................................................................... 4-6
Table 4-7	COM Audio and Mic Keys ..................................................................................	4-6
Table 4-8	Alert Audio I/O ....................................................................................................	4-7
Table 4-9	AUX and NAV Audio Inputs...............................................................................	4-7
Table 4-10	Failsafe Warning Audio .....................................................................................	4-8
Table 4-11	Music Inputs .......................................................................................................	4-8
Table 4-12	TEL Audio/XCVR 3 I/O ....................................................................................	4-9
Table 4-13	Headset Outputs .................................................................................................	4-9
Table 4-14	Speaker Audio Output ......................................................................................	4-10
Table 4-15	Discrete Inputs..................................................................................................	4-10
Table 4-16	Discrete Outputs ...............................................................................................	4-10

190-01879-11	GMA 245/245R Installation Manual
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1 GENERAL DESCRIPTION

1.1 Introduction

This manual is intended to provide mechanical and electrical information for use in the planning and design of an installation of the GMA 245 into an aircraft. This manual is not a substitute for an approved airframe-specific maintenance manual, installation design drawing, or complete installation data package. Attempting to install equipment by reference to this manual alone and without first planning or designing an installation specific to your aircraft may compromise your safety and is not recommended.

1.2 Equipment Description

The Garmin GMA 245 Audio Panel is not a TSO-certified product and has received no FAA approval or endorsement.

The GMA 245 is a high-fidelity digital audio panel that collects, processes, and distributes audio signals to crew and passengers. The GMA 245 digital signal processing (DSP) core filters the audio signals and provides digital audio routing to minimize noise.

The GMA 245 provides a speaker output for use as a cockpit speaker. The GMA 245 also includes a cockpit voice recorder and playback feature to help in situations where a COM transmission may need to be heard again. In addition, the GMA 245 uses Bluetooth for listening to music and making phone calls, or sending headset audio to a VIRB XE, and a 10 Watt USB charge port for phones and tablets.

Other features include intuitive configuration, a lighting bus input, SD Card socket for code loads and Bluetooth firmware updates, an 8 position DIP switch for installation settings, and multiple audio switching functions. LED-illuminated push-buttons (keys) allow audio selection and annunciation for selection of NAV, COM, and other audio. Photocell dimming circuitry automatically adjusts the brightness of the annunciators. Backlighting is controlled by the aircraft lighting bus inputs if the lighting bus is connected. If the lighting bus is not connected, backlighting is controlled by the photocell. A fail-safe circuit connects the pilot's headset and microphone directly to COM 1 and a fail-safe warning audio input in the event that power is interrupted or the unit is turned off.

The GMA 245 has 2 music inputs in addition to the Bluetooth, NAV, COM, and ICS selections. The GMA 245 is easily configurable without an external PC connection. The GMA 245 has automatic intercom squelch and optional keyed intercom squelch. The GMA 245 also contains a CAN Bus that will interface to the G3X Touch system.

190-01879-11	GMA 245/245R Installation Manual
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1.2.1Features Summary

•6 Microphone Inputs - Pilot, Copilot, 4 Passenger

•2 Microphone Keys - Pilot, Copilot

•3 Transceiver Channels - COM 1, COM 2, TEL

•5 Receiver Inputs - NAV 1, NAV 2, AUX 1, AUX 2, AUX 3

•2 Music Inputs

•4 Alert Inputs (unswitched)

•1 Speaker Output

•3 Headset Outputs - Pilot, Copilot, Passenger (passenger output can drive 4 headsets)

•5 Discrete Inputs

•1 Discrete Outputs

•1 Failsafe Channel - (only heard during failed mode or power off)

•1 CAN Bus Interface

•Lighting Bus

•Bluetooth (not shared with Music 1 or Music 2)

•SD Card Socket

•8 Position DIP Switch

•USB Charge Port

1.3Technical Specifications

1.3.1Physical Characteristics

Table 1-1 Physical Characteristics GMA 245

	Characteristic	Specification
	Bezel Height	1.30 inches (33.0 mm)
	Bezel Width	6.30 inches (160.0 mm)
	Rack Height (Dimple to Dimple)	1.33 inches (34.0 mm)
	Rack Width	6.30 inches (160.0 mm)
	Depth Behind Panel with Connectors (measured from face of aircraft	8.09 inches (205.0 mm)
	panel to rear of connector backshells)
	GMA 245 Weight (Unit Only)	1.10 lbs (0.49 kg)
	GMA 245 Weight (Installed with rack, backplate, and connectors)	1.78 lbs (0.81 kg)

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Table 1-2 Physical Characteristics GMA 245R

Characteristic	Specification
Unit Height	1.36 inches (34.5 mm)
Unit Width	6.29 inches (159.8 mm)
Unit Depth	6.59 inches (167.3 mm)
Unit Depth w/End Mount Bracket Installation	7.71 inches (195.7 mm)
Unit Depth w/End Mount Installation and Connectors	9.06 inches (230.1 mm)
Unit Width w/Side Mount Bracket Installation	7.21 inches (183.1 mm)
Unit Depth w/Side Mount Bracket Installation and Connectors	8.50 inches (215.8 mm)
GMA 245R Weight (Unit, Mounting Bracket, and Connectors)	1.39 lbs (0.63 kg)

1.3.2Electrical Specifications

Table 1-3 Electrical Characteristics

	Characteristic	Specification
	Temperature	-20º C to +55º C (Operation)
		-55º C to +85º C (Storage)
	Range
		-40º C to +70º C (Short term)
	Altitude	55,000 Feet
		Overpressure -15,000 Feet
		Dedicated Transceiver inputs: 3 (including TEL)
		Dedicated Receiver inputs: 5 (AUX 1, 2, and 3, selected with a single key; NAV
		1 and 2 independently selectable)
		Alert (unswitched) inputs: 4 (each with configurable volume)
	Audio Panel	Input impedance: 600 Ω
	Functions	Input isolation: 60 dB minimum
		Alert/Receiver/Transceiver bandwidth: 100 Hz to 6.5 kHz
		Special functions: Fail-safe operation
		All inputs use MASQ™ processing (Master Avionics Squelch)
		Max input 5 Vrms
		Positions: 6 - Pilot, Copilot, 4 Passengers
		Volume controls: 4 (Pilot ICS, Pilot Music, Copilot/Passenger ICS,
		Copilot/Passenger Music)
		Microphone input impedance: 150 Ω (compatible with 150 to 600 Ω mics)
	Intercom Functions	Microphone bias voltage: 11 Vdc delivered through 470 Ω
		Intercom isolation modes: 3 - Pilot, Crew, and All
		Telephone interfaces: 1 full-duplex (use rear LRU pins or Bluetooth)
		ICS Auto-Squelch/VOX: Independent DSP (digital signal processing) determined
		thresholds for each mic
		Note that keyed intercom is optional. Auto-squelch not available when using
		keyed ICS.

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	Table 1-3 Electrical Characteristics
Characteristic	Specification
	Output amplifiers: 3 Stereo - Pilot, Copilot, Passengers
	Power, Load, and Distortion: 65 mW into 150 Ohms with <10%
Headphone	THD+N @ 10% output <3% THD+N
Outputs	Typical Operating Distortion: <1% THD+N
	3dB Frequency Response Bandwidth: 20 Hz to 20 kHz for Music
	350 Hz to 6.5 kHz for Other Audio (MICs, Radios, Alerts)
	Music inputs (stereo): 2
	Music input impedance: 600 Ω (differential)
	Music gain: +24dB @ max. volume
	Music input level:<200 mVrms for full power* output @ max music volume knob
Music Functions	position (typ.)
	3.0 Vrms max music input level
	Music bandwidth: 20 Hz to 20 kHz @ full power output
	Music distortion: <0.1% THD+N (typ.) @ full power, full bandwidth
	*Full power output refers to 65 mW into 150 Ω at the headset
	Bluetooth 3.00 Compliant, allows music, cell phone calls, and interface with the
	VIRB XE action camera. Bluetooth supports HFP (including HFP v1.6 Wide
Bluetooth	Band Speech mode), A2DP, and AVRCP.
Connectivity	The GMA stores 10 paired devices and overwrites the least recently connected
	device when a new device is paired. Only 1 Bluetooth connection allowed at one
	time. The VIRB XE cannot be connected when using a phone (and vice versa).
	USB charge port - Rated for 10 W. The GMA 245 charge port features USB port
	detection that will connect the optimum charge rate for the device connected.
USB Charge Port	The charge port supports a maximum of 2.1 Amp charge current for devices.
	The USB charge port will shutdown and protect the GMA for current draw above
	2.3 Amps.

Table 1-4 Speaker Output

	Aircraft Voltage	Speaker Impedance	Output Power
	14V	4 Ω	3 Watts
		8 Ω	Not Recommended
	28V	4 Ω	10 Watts
		8 Ω	7 Watts

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1.3.3Power Requirements

The GMA 245/245R will operate down to emergency voltage (9 Volts). Below 11 Volts, the USB charge port and the speaker are disabled.

Table 1-5 GMA 245/245R Power Requirements

Characteristic	Specification
Input Voltage Range	11 to 33 Vdc
Leakage Current*	< 1 mA

*Current the unit draws if turned off (GMA 245 is turned of by the knob, GMA 245R can only be turned off by breaker).

Table 1-6 GMA 245 Power Requirements

	Characteristic	Current Draw	Power Consumption
	Idle Current*	0.32 A @ 14 VDC	4.48 W @ 14 VDC
		0.18 A @ 28 VDC	5.04 W @ 28 VDC
	Typical Operating Current without USB charge	0.77 A @ 14 VDC	10.78 W @ 14 VDC
	port being used.	0.40 A @ 28 VDC	11.20 W @ 28 VDC
	Maximum Current with no USB charge port	1.11 A @ 14 VDC	15.54 W @ 14 VDC
	connection	0.87 A @ 28 VDC	24.36 W @ 28 VDC
	Maximum Current with USB charge port	2.31 A @ 14 VDC	32.34 W @ 14 VDC
	connection	1.45 A @ 28 VDC	40.60 W @ 28 VDC

*Unit current drawn with power applied, no audio, and minimum lighting.

Table 1-7 GMA 245R Power Requirements

	Characteristic	Current Draw	Power Consumption
	Idle Current*	0.32 A @ 14 VDC	4.48 W @ 14 VDC
		0.18 A @ 28 VDC	5.04 W @ 28 VDC
	Typical Operating Current without USB charge	0.60 A @ 14 VDC	8.40 W @ 14 VDC
	port being used.	0.32 A @ 28 VDC	8.96 W @ 28 VDC
	Maximum Current with no USB charge port	0.92 A @ 14 VDC	12.88 W @ 14 VDC
	connection	0.77 A @ 28 VDC	21.56 W @ 28 VDC
	Maximum Current with USB charge port	2.1 A @ 14 VDC	29.40 W @ 14 VDC
	connection	1.35 A @ 28 VDC	37.80 W @ 28 VDC
	*Unit current drawn with power applied, no audio.

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1.4 Reference Documents

The following publications are sources of additional information for installing the GMA 245. The installer should read all referenced materials along with this manual before attempting installation.

	Table 1-8 Reference Documents
Part Number		Document
190-01115-01		G3X Installation Manual
190-01754-00		G3X Touch Pilot’s Guide
190-01879-10		GMA 245 Pilot's Guide

190-01879-11	GMA 245/245R Installation Manual
Rev. 7	Page 1-6

2 INSTALLATION OVERVIEW

2.1 Introduction

This section provides the necessary information for the installation and checkout of the GMA 245 Audio Panel. Installation of the GMA 245 will differ according to equipment location and other factors. The appendices contain interconnect wiring diagrams, mounting dimensions, and information pertaining to installation.

Careful planning and consideration of the suggestions in this section are required to achieve the desired performance and reliability from the GMA 245. The guidance of FAA advisory circulars AC 43.13-1B and AC 43.13-2B, where applicable, may be found useful for making retro-fit installations that comply with FAA regulations.

2.2 Installation Materials

2.2.1Unit Configurations

Table 2-1 Catalog Part Numbers

			Model	Catalog Part Number	Unit Only Part Number
	GMA 245	Unit Only		010-01318-00	011-03519-00
	GMA 245	Standard (includes		010-01318-01	011-03519-00
	items in Table 2-2)
	GMA 245R		Unit Only	010-01471-00	011-03784-00
	GMA 245R		Standard Kit	010-01471-01	011-03784-00
	(includes items in Table 2-3)

2.3 Available Accessories

2.3.1Standard Accessories

Table 2-2 Contents of GMA 245 Standard Installation Kit

Item	Part Number
Sub-Assy, Back Plate, GMA 245/245R (also used for GMA 240/340) (Table 2-4)	011-00678-00
Conn Kit, GMA 245/245R (also used for GMA 35/350) (Table 2-5)	011-02302-00
Sub-Assy, GMA 245, Ring Terminal screw/washer access kit (Table 2-6)	011-04151-00
SMP, Install Rack, GMA 245 (also used for GMA 240/340)	115-00262-00

Table 2-3 Contents of GMA 245R Standard Kit

Item	Part Number
Side Mount Bracket, GMA 245R	011-04150-00
Connector Kit, GMA 245R (see Table 2-8)	011-03828-00

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Rev. 7	Page 2-1

Table 2-4 Contents of GMA 245 Back Plate Kit (011-00678-00, also used for GMA 240/340)

Item	Part Number	Quantity
Pre-bagged screws “D” (Table 2-7)	011-02650-03	1
Nut Cover, SMP	115-00261-00	1
Connector Plate Assembly, DCP	125-00040-00	1
Nut, Std, English, SS, #6-32	210-00036-07	1
Screw, 4-40 x 0.250, PHP, SS/P, w/NYL	211-60234-08	2

Table 2-5 Contents of GMA 245 Conn Kit (011-02302-00, also used for GMA 35/350)

Item	Part Number	Quantity
Backshell w/Hardware 25 and 44 pin	011-00950-02	2
Ground Adapter, Shell 1-3	011-01169-00	4
Screw 4-40 x 0.437, FLHP100, SS/P, Nylon	211-63234-11	4
Hi Density D-Sub Connector, Mil Crimp, 44 ckt	330-00185-44	2
Contact Pin, Mil Crimp, Size 22D	336-00021-00	94

Table 2-6 Contents of GMA 245 Ring Terminal Kit (011-04151-00)

Item	Part Number	Quantity
Screw, 8-32 x 0.312, PHP, SS/P	211-60209-09	8
Washer, Split Lock, Size 8	212-00018-04	8
Washer, Flat, Non-Std, SS, ID 0.195, OD 0.354	212-20065-00	8

Table 2-7 Contents of GMA 245 Pre-bagged Screws “D” (011-02650-03)

Item	Part Number	Quantity
Screw, 4-40 x 0.250, PHP, SS/P, w/NYL	211-60234-08	4
Cable Tie, 4.0”	231-10001-00	1

Table 2-8 Contents of GMA 245R Conn Kit (011-03828-00)

Item	Part Number	Quantity
Jackscrew Backshell	011-01855-02	2
Screw, 8-32 x 0.312, PHP, SS/P	211-60209-09	8
Washer, Split Lock, Size 8	212-00018-04	8
Washer, Flat, Non-Std, SS, ID 0.195, OD 0.354	212-20065-00	8
Hi Density D-Sub Connector, Mil Crimp, 44 ckt	330-00185-44	2
Contact Pin, Mil Crimp, Size 22D	336-00021-00	88

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2.3.2Additional Equipment Required

•Cables: The installer will fabricate and supply all system cables. Interconnect wiring diagrams are detailed in Appendix C.

•Hardware: #6-32 100° flat head screw (6 ea.) and #6-32 self-locking nut (6 ea.). Hardware required to mount the GMA 245 installation rack is not provided.

•Stereo headphone jacks (up to 6), microphone jacks (up to 6), 3.5mm stereo jacks (up to 2). Insulating type jacks or insulating washers should be used for all jacks to isolate them from aircraft chassis.

•For GMA 245R, Hardware: (4-6 ea) #10-32 bolts and (4-6 ea) #10-32 self-locking nut for installing the mounting bracket to the aircraft frame.

•For GMA 245, Tool: 3/32" Allen for tightening the unit into the rack and backplate.

•Push/Pull (that can be manually reset) circuit breaker (5 Amp recommended).

•Tie Wraps or Lacing Cord

•Ring Terminals (for grounding) #8 size, Yellow, Blue, and Pink.

•Silicon Fusion Tape (GPN 249-00114-00) to wrap the cable bundle. Silicone fusion tape is available at most major suppliers like Mouser, Digi-key, and Home Depot.

•Solder Sleeves for terminating the shields of the cable to the GMA backshell. See Section 3.3 for part numbers.

•Optional USB Type A Panel Mount/Bulkhead Jack to Type A USB male cable to use with GMA 245R for connecting to a panel mounted USB jack. Example L-COM parts for reference- UPMAA-1M (3.3 feet), UPMAA-075M (2.46 feet), UPMAA-05M (1.64 feet).

•Heat shrink tubing

•SD card needed for updating software in the GMA 245 when not integrated in a G3X Touch system. Garmin recommends using a 4 GB Sandisk® SD card.

Insulating Washers for Headset and Microphone Jacks can be found at the following suppliers:

Dallas Avionics

100053 - Shoulder Washer

100054 - Flat Washer

Digi-key

SC1147-ND - Shoulder Washer SC1146-ND - Flat Washer

Mouser

502-S-1029 – Shoulder Washer

502-S-1028 – Flat Washer

Newark

S1029 - Shoulder Washer

S1028 - Flat Washer

Switchcraft

S1029 – Shoulder Washer

S1028 – Flat Washer

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2.4 Installation Considerations

The GMA 245 interfaces with various avionics equipment. Fabrication of a wiring harness is required. Sound mechanical and electrical methods and practices are required for installation of the GMA 245.

NOTE

3D audio is not available when using a mono headset or in aircraft wired with mono headset jacks. 3D audio (even if enabled), will not be available with mono audio headset jacks or mono headsets. It is recommended that stereo jacks and stereo headsets be used.

2.5 GMA 245R Status LED

The GMA 245R has red and green status LEDs visible on the front of the unit that indicate the unit’s current status. The status indications are:

Table 2-9 Status LED Indications

	LED Indication	Description
	No Light	No Power
	Steady Green	On, but not communicating via CAN Bus
	Flashing Green	On and communicating via CAN Bus
	Red	Hardware Fault
	Alternating Red/Green	CAN bus network error two similar devices are
		configured with the same unit ID

2.6 GMA 245R Installation Guidance for Best Bluetooth Performance

The GMA 245 (panel mount) provides optimal Bluetooth performance because the Bluetooth transceiver is mounted inside the cockpit with an unobstructed view of the phone and other devices being used in the cockpit. Good Bluetooth performance can be also be obtained with the GMA 245R (remote mount) if mounting location and orientation are selected to keep the instrument panel (and other aircraft metal structures) from blocking the Bluetooth signal.

GMA 245R mounting location/orientation will vary for each installation depending on aircraft body type (metal or fiberglass) and the surrounding structures/equipment. The GMA 245R Bluetooth transceiver is located behind the black plastic front face of the unit as shown in the red rectangle in Figure 2-1.

Figure 2-1 GMA 245R Bluetooth Transceiver Location

For best performance, mount the GMA 245R with the front of the unit facing the cockpit and centered laterally between the two aircraft sides. For example, mounting the GMA 245R at the bottom of a center radio stack facing into the cockpit (aft) typically works well, although mounting it just below the instrument panel would likely produce better results.

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Mounting the GMA 245R with the front of the unit facing perpendicular to the cockpit (facing the left or right side of the aircraft), whether vertically or horizontally mounted, may have reduced connectivity depending on which side of the aircraft surrounding structures/equipment are located.

Mounting the GMA 245R with the face down can function well in locations where the face of the GMA 245R is oriented towards the aircraft cockpit floor, with the area between the floor and the aircraft panel open. Mounting the GMA 245R with the face up can work well depending on what structures/ equipment are located between the GMA 245R and the cockpit.

Mounting the GMA 245R with the front face of the unit facing forward may work in some installations, but generally results in reduced Bluetooth performance.

Do not install the GMA 245R in a metal box or beneath a floor panel, as this will attenuate (decrease) the Bluetooth signal. If the installation contains another device that provides a Bluetooth interface, mount the devices apart from each other as much as possible (at minimum, leave a small gap between the devices) to prevent signal interference.

2.7 Cabling and Wiring

Refer to the interconnect examples in Appendix C for wire gauge guidance.

In some cases, a larger gauge wire such as AWG #18 or #20 may be needed for power connections. If using AWG #18 barrel contacts, ensure that no two contacts are mounted directly adjacent to each other. This minimizes the risk of contacts touching and shorting to adjacent pins and to ground.

Use wire and cable meeting the applicable aviation regulation. When routing wire and cable, observe the following precautions:

•Keep wire and cable as short and direct as possible

•Avoid sharp bends

•Avoid routing near power sources (e.g. 400 Hz generators, trim motors, etc) or near power of fluorescent lighting

•For Power and Ground use 2 individual wires for the units to the power source. Do not splice 2 wires to one at the unit for power and ground.

NOTE

Avoid installing the unit near heat sources. If this is not possible, ensure that additional cooling is provided. Allow adequate space for installation of cables and connectors. The installer will supply and fabricate all of the cables.

2.8 Cooling Air

The GMA 245 does not have provisions for attaching cooling air, however the thermal characteristics of the installation should always be assessed. An undesirable thermal condition could be created due to the unit's own internal power dissipation combined with restricted ventilation, or due to heat generated by adjacent equipment. Limiting thermal build up, by means of fan or natural convection is always a good practice and recommended to increase the product life.

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2.9 Configuration, and Adjustment Options

The GMA 245 has several configuration/adjustment options (see Section 2.9.6). These configuration/ adjustments are as follows:

•Wired Telephone Volume

•Auxiliary 1 Volume

•Auxiliary 2 Volume

•Auxiliary 3 Volume

•Alert 1 Volume

•Alert 2 Volume

•Alert 3 Volume

•Alert 4 Volume

•Speaker Volume

•Master Avionics Squelch (Section 2.9.1)

•High Cockpit Noise Option (Section 2.9.2)

•Music In Isolation Option (Section 2.9.3)

•Alerts Mute Music Option (Section 2.9.4)

2.9.1Master Avionics Squelch (MASQ) Function

MASQ functions to prevent low level noise from being passed to the headset ear speakers, this is known as “squelching” or muting the audio. To “break” or “open” squelch means that enough audio signal is present that the signal is passed through and can be heard. Increasing this setting increases the signal level required to break/open squelch. If needed, adjust the MASQ SQ level so the audio background noise is muted.

2.9.2High Cockpit Noise Option

Enable to help reduce intercom background noise in very high noise cockpit environments. Disabled by default.

2.9.3Music In Isolation Option

Enable to allow pilot and copilot to hear selected music when PILOT or CREW isolation mode is active. Disabled by default.

2.9.4Alert Mute Music Option

Disable this option to prevent music from being muted when alert audio is heard. Enabled by default.

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2.9.5DIP Switch Configuration

The DIP switches are used to select the configuration settings listed in Table 2-10, and are located on the right side of the unit next to the SD card slot as shown in Figure 2-2.

SD CARD SLOT

DIP SWITCHES

Figure 2-2 SD Card Slot and DIP Switch Locations

2.9.5.1GMA 245 DIP Switch Configuration Settings

The GMA 245 DIP switch configuration settings are listed in Table 2-10. Per the label attached to the top cover of the unit, the down switch position is ON, the up switch position is OFF.

Table 2-10 GMA 245 DIP Switch Configuration Settings

	Switch	Function	Description
		ENABLED KEYED	When set to ON, the intercom system (ICS) will only allow intercom
	1		MIC audio to be heard when the corresponding ICS KEY for the MIC
		ICS
			position is pressed. When set to ON, auto squelch will NOT be active.
			This setting is for intercom 3D audio. Normally the Pilot will be
			positioned to the left in the Copilot’s headset, and the Copilot will be
	2	PILOT IN RIGHT	positioned to the right in the Pilot’s headset. When set to ON, this
		SEAT	setting reverses that so the Pilot is positioned to the right in the
			Copilot’s headset, and the Copilot is positioned to the left in the Pilot’s
			headset.
		MUTE ON COM	When set to ON, the monitored COM radio is muted during mic-
	3		selected COM transmission (mic-selected COM is still heard, but not
		TX
			the monitored COM radio).
	4	RESERVED	LEAVE SWITCH IN OFF POSITION
	5	RESERVED	LEAVE SWITCH IN OFF POSITION
	6	RESERVED	LEAVE SWITCH IN OFF POSITION
	7	RESERVED	LEAVE SWITCH IN OFF POSITION
			When set to ON, this prevents use of the GMA 245’s config mode UI.
	8	CONFIGURATION	When installed in a G3X Touch system, this setting prevents the use of
		LOCKOUT	the GMA 245’s config mode UI, but it does not prevent an integrated
			G3X Touch system from configuring the unit.

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