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190-01879-11 May, 2021 Revision 10

GMA 245/245R

Installation Manual

190-01879-11 GMA 245/245R Installation Manual

Rev. 10 Page A

Garmin Ltd. or its subsidiaries

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 is available at garmin.com/aviationwarranty.

RECORD OF REVISIONS

Revision Revision Date Description

6 08/21/17 Updated Transmitter Grant of Equipment Authorization info

7 03/09/18 Updated Post Installation Checkout Procedure

8 02/22/19 Added GMA 245R MKR unit info

9 07/01/19 Updated interconnect drawings

10 05/17/21 Updated accessories info

190-01879-11 GMA 245/245R Installation Manual

Rev. 10 Page i

CURRENT REVISION DESCRIPTION

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.

Revision Page

Number

Section

Number Description of Change

10 2-2, 2-3 2.3.1 Updated Table 2-3, Table 2-9, and added Table 2-4 per

new accessory info

190-01879-11 GMA 245/245R Installation Manual

Rev. 10 Page ii

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

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. 10 Page iii

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. 10 Page iv

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...................................................................................................... 2-2

2.4 Installation Considerations .............................................................................................. 2-5

2.5 GMA 245R Status LED................................................................................................... 2-7

2.6 GMA 245R Installation Guidance for Best Bluetooth Performance ............................... 2-8

2.7 Cabling and Wiring.......................................................................................................... 2-9

2.8 Cooling Air ...................................................................................................................... 2-9

2.9 Configuration, and Adjustment Options........................................................................ 2-10

2.10 Updating Software ....................................................................................................... 2-15

2.11 Noise ............................................................................................................................ 2-16

2.12 Mounting Requirements .............................................................................................. 2-17

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

4.8 Marker Beacon Antenna, GMA 245R MKR Unit Only................................................ 4-11

190-01879-11 GMA 245/245R Installation Manual

Rev. 10 Page vi

LIST OF FIGURES

FIGURE PAGE

Section 1 General Description ...........................................................................1-1

Section 2 Installation Overview.........................................................................2-1

Figure 2-1 GMA 245R MKR Marker Beacon Coaxial Cable D-Sub Termination.............. 2-6

Figure 2-2 GMA 245R Bluetooth Transceiver Location...................................................... 2-8

Figure 2-3 SD Card Slot and DIP Switch Locations .......................................................... 2-11

Figure 2-4 Front Panel Configuration................................................................................. 2-13

Figure 2-5 GMA 245 Unit Rack (115-00262-00)............................................................... 2-17

Figure 2-6 GMA 245R w/Mounting Brackets on Front and Back ..................................... 2-18

Figure 2-7 GMA 245R w/Mounting Brackets on Sides ..................................................... 2-18

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

190-01879-11 GMA 245/245R Installation Manual

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FIGURE PAGE

Figure B-6 GMA 245 Panel Cutout Drawing .......................................................................B-6

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 LEMO Jack Wiring Example Interconnect Drawing .........................................C-7

Figure C-8 J2401 & J2402 Connector Layout Drawing.......................................................C-8

190-01879-11 GMA 245/245R Installation Manual

Rev. 10 Page viii

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 1-5 GMA 245/245R Power Requirements ................................................................. 1-5

Table 1-6 GMA 245 Power Requirements ........................................................................... 1-5

Table 1-4 Speaker Output ..................................................................................................... 1-5

Table 1-8 Reference Documents........................................................................................... 1-6

Table 1-7 GMA 245R Power Requirements......................................................................... 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.................................................. 2-2

Table 2-3 Contents of GMA 245R Standard Kit .................................................................. 2-2

Table 2-4 Contents of GMA 245R MKR Standard Kit ........................................................ 2-2

Table 2-5 Contents of GMA 245 Back Plate Kit (011-00678-00, also used for

GMA 240/340)....................................................................................................................... 2-2

Table 2-6 Contents of GMA 245 Conn Kit (011-02302-00, also used for GMA 35/350) ... 2-3

Table 2-7 Contents of GMA 245 Ring Terminal Kit (011-04151-00) ................................. 2-3

Table 2-8 Contents of GMA 245 Pre-bagged Screws “D” (011-02650-03)......................... 2-3

Table 2-9 Contents of GMA 245R Conn Kit (011-03828-00/-10) ....................................... 2-3

Table 2-10 Pin and Crimp Tool Part Numbers ..................................................................... 2-6

Table 2-11 Status LED Indications....................................................................................... 2-7

Table 2-12 GMA 245 DIP Switch Configuration Settings ................................................. 2-11

Table 2-13 GMA 245R DIP Switch Configuration Settings .............................................. 2-12

Table 2-14 Hardwire Configuration Options...................................................................... 2-14

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

190-01879-11 GMA 245/245R Installation Manual

Rev. 10 Page ix

TABLE PAGE

Table 4-4 CAN Bus .............................................................................................................. 4-4

Table 4-5 Lighting Bus ......................................................................................................... 4-5

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

Table 4-17 Marker Beacon Antenna Pins........................................................................... 4-11

Section A Installation Considerations for Upgrading from a Garmin

GMA 240 ............................................................................................A-1

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.

The GMA 245R is a remote mount version of the GMA 245. The GMA 245R provides audio system

capabilities to a Garmin avionics system such as the G3X Touch (which provides control integration for

the GMA 245R). Garmin provides two versions of the GMA 245R which are identifiable by the Garmin

Part Number (GPN) marked on the side of the unit. The GMA 245R marked with the GPN 011-03784-10

adds Marker Beacon Receiver capability to the unit. For referencing purposes only, this document

identifies this version of the GMA 245R as GMA 245R MKR when applicable.

190-01879-11 GMA 245/245R Installation Manual

Rev. 10 Page 1-2

1.2.1 Features 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

• Marker Beacon Receiver (GMA 245R MKR version only)

1.3 Technical Specifications

1.3.1 Physical 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

panel to rear of connector backshells) 8.09 inches (205.0 mm)

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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Rev. 10 Page 1-3

1.3.2 Electrical Specifications

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 (011-03784-00) Weight

(Unit, Mounting Bracket, and Connectors) 1.39 lbs (0.63 kg)

GMA 245R MKR (011-03784-10) Weight

(Unit, Mounting Bracket, and Connectors) 1.42 lbs (0.64 kg)

Table 1-3 Electrical Characteristics

Characteristic Specification

Temperature

Range

-20º C to +55º C (Operation)

-55º C to +85º C (Storage)

-40º C to +70º C (Short term)

Altitude 55,000 Feet

Overpressure -15,000 Feet

Audio Panel

Functions

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)

Input impedance: 600 Ω

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

190-01879-11 GMA 245/245R Installation Manual

Rev. 10 Page 1-4

Intercom Functions

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)

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.

Headphone

Outputs

Output amplifiers: 3 Stereo - Pilot, Copilot, Passengers

Power, Load, and Distortion: 65 mW into 150 Ohms with <10%

THD+N @ 10% output <3% THD+N

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 Functions

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

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

Connectivity

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

Band Speech mode), A2DP, and AVRCP.

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

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.

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 1-3 Electrical Characteristics

Characteristic Specification

190-01879-11 GMA 245/245R Installation Manual

Rev. 10 Page 1-6

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 1-7 GMA 245R Power Requirements

Characteristic Current Draw Power Consumption

Idle Current* 0.32 A @ 14 VDC

0.18 A @ 28 VDC

4.48 W @ 14 VDC

5.04 W @ 28 VDC

Typical Operating Current without USB charge

port being used.

0.60 A @ 14 VDC

0.32 A @ 28 VDC

8.40 W @ 14 VDC

8.96 W @ 28 VDC

Maximum Current with no USB charge port

connection

0.92 A @ 14 VDC

0.77 A @ 28 VDC

12.88 W @ 14 VDC

21.56 W @ 28 VDC

Maximum Current with USB charge port

connection

2.1 A @ 14 VDC

1.35 A @ 28 VDC

29.40 W @ 14 VDC

37.80 W @ 28 VDC

*Unit current drawn with power applied, no audio.

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. 10 Page 2-1

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

2.2.1 Unit 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

items in Table 2-2 )010-01318-01 011-03519-00

GMA 245R Unit Only 010-01471-00 011-03784-00

GMA 245R Standard Kit

(includes items in Table 2-3 )010-01471-01 011-03784-00

GMA 245R MKR Unit Only 010-01471-10 011-03784-10

GMA 245R MKR Standard Kit

(includes items in Table 2-4 )010-01471-11 011-03784-10

190-01879-11 GMA 245/245R Installation Manual

Rev. 10 Page 2-2

2.3 Available Accessories

2.3.1 Standard 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) ( 011-00678-00Table 2-5)

Conn Kit, GMA 245/245R (also used for GMA 35/350) (Table 2-6) 011-02302-00

Sub-Assy, GMA 245, Ring Terminal screw/washer access kit (Table 2-7) 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 115-02282-00 (ordered as 011-04150-00)

Connector Kit, GMA 245R (see ) 011-03828-00Table 2-9

Table 2-4 Contents of GMA 245R MKR Standard Kit

Item Part Number

Side Mount Bracket, GMA 245R, PMA 115-02282-10 (ordered as 011-04150-10)

End Mount Bracket, GMA 245R, PMA 115-02283-10 (ordered as 011-04150-11)

Connector Kit, GMA 245R, PMA (see ) 011-03828-10Table 2-9

Table 2-5 Contents of GMA 245 Back Plate Kit (011-00678-00, also used for GMA 240/340)

Item Part Number Quantity

Pre-bagged screws “D” ( ) 011-02650-03 1Table 2-8

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

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Rev. 10 Page 2-3

Table 2-6 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 2-7 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 2-8 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 2-9 Contents of GMA 245R Conn Kit (011-03828-00/-10)

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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2.3.2 Additional 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

190-01879-11 GMA 245/245R Installation Manual

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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.

2.4.1 Marker Beacon Antenna Installation

2.4.1.1 Location Considerations

The marker beacon antenna should be mounted on a flat surface on the underside of the aircraft body.

NOTE

Do not install the antenna inside the aircraft. Installing the antenna inside the aircraft

limits the antenna reception and increases the antennas susceptibility to radiation from

components inside the aircraft.

Mount the antenna so that there is a minimum of structure between it and the ground radio stations. Locate

it as far away as possible from transmitter antennas.

2.4.1.2 Marker Beacon Antenna Mounting

Install the antenna according to the antenna manufacturer’s instructions. If the antenna is being installed on

a composite aircraft, ground planes must sometimes be added. Conductive wire mesh, radials or thin

aluminum sheets embedded in the composite material provide the proper ground plane allowing the

antenna pattern (gain) to be maximized for optimum performance.

2.4.1.3 Marker Beacon Antenna Cable

Use coaxial cable meeting the applicable aviation regulation for the marker beacon antenna. Any cable

meeting specifications is acceptable for the installation. When routing antenna cables, observe the

following precautions:

• All cable routing should be kept as short and as direct as possible

• Avoid sharp bends

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

for fluorescent lighting

• Allow a 12 inch minimum separation between any other cables, including antenna cables (e.g

ADF, COM, NAV, GS, MARKER)

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2.4.1.4 Marker Beacon Antenna Cable Installation

This section provides guidance for terminating the coaxial cable into the D-Sub connector. See the system

interconnect section for pin assignments.

NOTE

Use coaxial cable meeting the applicable aviation regulation for the marker beacon

antenna. Route the cable to the D-Sub as described in Section 2.4.1.3.

When terminating the coaxial cable into the D-Sub observe the following guidance (refer to Figure 2-1):

• Keep the distance from the end of the exposed shield to D-Sub as short as possible.

• Ensure the distance from the beginning of the exposed shield to D-Sub is no more than

1.5 inches long.

• Terminate the center conductor by directly connecting it to the D-sub through a crimp pin

without a pigtail.

Figure 2-1 below represents a suggested method for terminating the marker beacon coaxial cable using

M17/128-RG400 terminated into a high density D-Sub connector. Refer to Table 2-10 for Crimp Tool, Pin,

and Crimp Tool Insert part numbers.

Figure 2-1 GMA 245R MKR Marker Beacon Coaxial Cable D-Sub Termination

Table 2-10 Pin and Crimp Tool Part Numbers

CRIMP TOOL PIN CRIMP TOOL INSERT

DANIELS MANUFACTUING CORP

DMC M22520/2-01 GAGE

AFM8 CRIMPING TOOL

Garmin Part Number

336-00021-00 K42

Garmin Part Number

336-00044-00 K774

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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 2-11 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

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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 2-2.

Figure 2-2 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.

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.

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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 ). These configuration/Section 2.9.6

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)

• Marker Beacon Receiver RF Threshold and Marker Audio Volume (GMA 245R MKR only)

2.9.1 Master 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.

2.9.2 High Cockpit Noise Option

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

default.

2.9.3 Music In Isolation Option

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

Disabled by default.

2.9.4 Alert Mute Music Option

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

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2.9.5 DIP Switch Configuration

The DIP switches are used to select the configuration settings listed in Table 2-12, and are located on the

right side of the unit next to the SD card slot as shown in Figure 2-3.

Figure 2-3 SD Card Slot and DIP Switch Locations

2.9.5.1 GMA 245 DIP Switch Configuration Settings

The GMA 245 DIP switch configuration settings are listed in Table 2-12. Per the label attached to the

top cover of the unit, the down switch position is ON, the up switch position is OFF.

Table 2-12 GMA 245 DIP Switch Configuration Settings

Switch Function Description

1ENABLED KEYED

ICS

When set to ON, the intercom system (ICS) will only allow intercom

MIC audio to be heard when the corresponding ICS KEY for the MIC

position is pressed. When set to ON, auto squelch will NOT be active.

2PILOT IN RIGHT

SEAT

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

positioned to the right in the Pilot’s headset. When set to ON, this

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.

3MUTE ON COM

When set to ON, the monitored COM radio is muted during mic-

selected COM transmission (mic-selected COM is still heard, but not

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

8CONFIGURATION

LOCKOUT

When set to ON, this prevents use of the GMA 245’s config mode UI.

When installed in a G3X Touch system, this setting prevents the use of

the GMA 245’s config mode UI, but it does not prevent an integrated

G3X Touch system from configuring the unit.

SD CARD SLOT

DIP SWITCHES

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Rev. 10 Page 2-12

2.9.5.2 GMA 245R DIP Switch Configuration Settings

The GMA 245R DIP switch configuration settings are listed in Table 2-13.

Table 2-13 GMA 245R DIP Switch Configuration Settings

Switch Function Description

1ENABLED KEYED

ICS

When set to ON, the intercom system (ICS) will only allow intercom

MIC audio to be heard when the corresponding ICS KEY for the MIC

position is pressed. When set to ON, auto squelch will NOT be active.

2PILOT IN RIGHT

SEAT

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

positioned to the right in the Pilot’s headset. When set to ON, this

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.

3MUTE ON COM

When set to ON, the monitored COM radio is muted during mic-

selected COM transmission (mic-selected COM is still heard, but not

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

8CONFIGURATION

LOCKOUT LEAVE SWITCH IN OFF POSITION

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2.9.6 Front Panel Configuration (GMA 245 only)

Enter configuration mode by holding down the COM1 MIC and SPKR keys while turning the unit on.

When in configuration mode, pressing the PLAY key will annunciate the current software/database

product version, e.g. “system two dot zero zero”.

When in configuration mode, pressing the COM1 MIC key selects volume mode. Press the COM1 MIC

key until the desired volume is annunciated, e.g “auxiliary one volume”.

When in configuration mode, pressing the COM2 MIC key selects Master Avionics Squelch mode.

When in configuration mode, pressing the SPKR key annunciates the current option, e.g. “Alerts Mute

Music Enabled” or “Cockpit High Noise Disabled”.

When in configuration mode, pressing the PILOT key increases the selected setting as indicated by the

LEDs on the Level Bar.

When in configuration mode, pressing the CREW key decreases the selected setting as indicated by the

LEDs on the Level Bar.

When adjusting Options in configuration mode, the PILOT and CREW keys are used to indicate the

current state and change the state. If the option is enabled, the PILOT key is lit solid and the CREW key

flashes (indicating that the CREW key can be pushed to disable the option). Likewise, if the option is

disabled, the CREW key is lit solid and the PILOT key flashes (indicating that the PILOT key can be

pushed to enable the option. The Level Bar is not used when in the options mode.

When in configuration mode, the LEDs in the Level Bar (Figure 2-4) light to indicate an increase/decrease

in the selected setting.

When in configuration mode, pressing COM1 and AUX keys simultaneously resets the configuration and

operating state back to factory defaults.

Figure 2-4 Front Panel Configuration

TOP ROW OF KEY ANNUNCIATORS INDICATES THE SELECTED

LEVEL OF ITEM BEING ADJUSTED (VOLUME AND MASQ ONLY).

THE ANNUNCIATORS TURN ON FROM LEFT TO RIGHT AS THE

ADJUSTMENT LEVEL INCREASES.

LEVEL BAR: ABOUT:

PRESSING AUDIBLY ANNUNCIATES

SOFTWARE AND DATABASE

PRODUCT VERSIONS (BOOT

BLOCK, SYSTEM, AUDIO, AND

BLUETOOTH).

ADJUSTMENTS:

‘PILOT’ USED FOR INCREASING

LEVELS OR ENABLING OPTIONS.

‘CREW’ USED FOR DECREASING

LEVELS OR DISABLING OPTIONS.

VOLUMES:

PRESSING CYCLES THROUGH

VOLUMES (AUX 1, 2, 3;

ALERT 1, 2, 3, 4;

WIRED TELEPHONE; SPEAKER).

MASQ:

PRESSING ENABLES MASQ

ADJUSTMENTS.

OPTIONS:

PRESSING CYCLES THROUGH

OPTIONS (ALERTS MUTE MUSIC,

COCKPIT HIGH NOISE, MUSIC

DURING ISOLATION).

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2.9.7 Hardwired Configuration Options

The configuration options in Table 2-14 are available by wiring the inputs to a pushbutton to ground (see

Figure C-2 and ). Figure C-3

Table 2-14 Hardwire Configuration Options

Connector Pin Description Type Function

J2401 16 PILOT ICS

KEY* Input

If DIP switch 1 is on, this active low input, when

grounded, will allow microphone audio to the intercom

from Pilot MIC.

J2401 24 COM ACTIVE

OUT* Output

This output is active when Receiving selected COM

audio or when transmitting on the MIC selected COM.

This output can be used to connect to other devices to

inhibit other devices from playing audio into the GMA

while there is COM activity.

J2402 13 PASSENGER

ICS KEY* Input

If DIP switch 1 is on, this active low input, when

grounded, will allow microphone audio to the intercom

from Passenger MIC.

J2402 20 COM SWAP* Input When grounded the MIC selected COM will swap.

J2402 22 PLAY KEY* Input

When grounded the last voice recorded message will

play. While playing, if grounded again, the previous

message will play.

J2402 30 COPILOT ICS

KEY* Input

If DIP switch 1 is on, this active low input, when

grounded, will allow microphone audio to the intercom

from Copilot MIC.

*Active Low

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2.10 Updating Software

The G3X Touch system is used to update the GMA 245R software. The GMA 245 (if connected in a G3X

Touch system), will also get software updates from the G3X Touch system. See the G3X Installation

Manual for instruction on performing software updates using the G3X Touch system.

When the GMA 245 is not integrated in a G3X Touch system, updating software is performed using an SD

card. Garmin recommends using a 4GB Sandisk® SD Card.

2.10.1 Checking Software Version

The GMA 245 comes pre-loaded with system software. However, if the software is out of date, it is

recommended that current software be loaded from an SD card into the GMA 245.

The current version of software can be retrieved in the configuration operating mode. See Section 2.9.6 for

instructions.

2.10.2 Creating a Software Loader SD Card

The software update mode allows the installer to load unit software using an SD software loader card.

NOTE

The application to create a loader card requires Windows 2000, XP, Vista, Windows 7, or

Windows 10. There is no Mac support at this time.

1. Go to the GMA 245 web page on Garmin’s website.

2. Download the GMA 245 software to your PC.

3. Ensure that an SD card (Garmin recommends a Sandisk® brand 4GB SD card) is connected to the

PC in the SD card slot.

4. Run the executable file that was downloaded and follow the prompts on the screen to create the

software loader card.

5. After the card has been created, select finish to complete the process.

6. Remove the card from the slot. The loader card is now ready to use.

2.10.3 Loading Software to the GMA 245

1. Remove the unit from the rack using a 3/32” Allen tool.

2. The SD card slot is on the right side of the unit next to the dip switches. Insert the SD card with

pins facing down (toward the bottom of the unit).

3. Install the unit back into the rack using a 3/32” Allen tool.

4. Press and hold the COM1 MIC and TEL keys while turning the unit on.

5. The GMA 245 will begin checking the SD card for updated software.

a) Do not turn the GMA 245 off or remove power during the update process.

b) The top row of keys, from left to right, will indicate the progress of the update process.

c) If a problem is encountered during the update process, all keys on the top row will flash at a

1 Hz rate.

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6. If a problem is encountered during the update process, follow the below steps for possible

solutions.

a) Use the Pilot Knob to power cycle the GMA 245, then perform the process again.

b) Attempt to re-download the GMA 245 software to the PC, recreating the loader SD card,

and perform the process again.

c) Recreate the loader card using the recommended Sandisk® brand 4GB SD card, and attempt

the update process again.

d) If still having difficulty performing the update, contact Garmin Aviation Technical support.

7. Once the update process is finished the GMA 245 will automatically reboot back into normal

operating mode.

8. The update card does not need to be removed after the update process and can be left in the GMA

245 at the installer’s discretion.

Once the unit has been updated, verify the correct software version is installed (see Section 2.9.6 for

instructions). If a Bluetooth firmware update is included with the software update, the Bluetooth firmware

will be updated automatically after the GMA 245 reboots. While a Bluetooth firmware update is being

performed in the GMA 245, the Bluetooth annunciator will blink in an ON - ON - OFF pattern for several

minutes. When the Bluetooth update is completed, the Bluetooth functions will return to normal operation.

2.11 Noise

Because the audio panel is a point in the aircraft where signals from many pieces of equipment are brought

together, care must be taken to minimize effects from coupled interference and ground loops.

Coupled interference can sneak into audio system interconnecting cables when they are routed near large

AC electric fields, AC voltage sources, and pulse equipment (strobes, spark plugs, magnetos, EL displays,

CRTs, etc). Interference can also couple into audio system interconnecting cables by magnetic induction

when they are routed near large AC current-carrying conductors or switched DC equipment (heaters,

solenoids, fans, autopilot servos, etc).

Ground loops are created when there is more than one path in which return currents can flow, or when

signal returns share the same path as large currents from other equipment. These large currents create

differences in ground potential between the various equipment operating in the aircraft. These differences

in potential can produce an additive effect at an audio panel signal input.

The audio panel may "see" the desired input signal plus an unwanted component injected by ground

differentials, a common cause of alternator-related noise. This is the main reason why all audio jacks

should be isolated from ground. Terminating audio shields just at one end eliminates another potential

ground loop injection point.

Single-point grounding cannot be overstressed for the various avionics producing and processing audio

signals. Single-point, in this context, means that the various pieces of equipment share a single common

ground connection back to the airframe. Good aircraft electrical/charging system ground bonding is also

important.

The wiring diagrams and accompanying notes in this manual should be followed closely to minimize noise

effects.

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2.12 Mounting Requirements

The GMA 245 mounting surface must be capable of providing structural support and electrical bond to the

aircraft to minimize radiated EMI and provide protection from High-Intensity Radiation Fields (HIRF).

The GMA 245 is mounted using a GMA 245 unit rack (Figure 2-5). See Section 3.6 for installation

instructions.

NOTE

Rear support is recommended to ensure a sturdy mount.

CAUTION

The top cover of the unit has a connector number (1 and 2) stamped into it and centered in

front of each connector. The 011-00678-00 backplate also has a stamped number on it. To

prevent damage to the unit, verify the connectors are positioned correctly (connector 1 is

connected in position 1) for the number 1 and number 2 locations. The stamped number 1

refers to J2401, and 2 refers to J2402.

Figure 2-5 GMA 245 Unit Rack (115-00262-00)

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Figure 2-6 GMA 245R w/Mounting Brackets on Front and Back

NOTE

The GMA 245R is shipped in the configuration shown in Figure 2-6.

Figure 2-7 GMA 245R w/Mounting Brackets on Sides

NOTE

The side mounting bracket show in Figure 2-7 is an additional part included in the

standard kit, and is also available as an optional accessory.

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3 INSTALLATION PROCEDURE

3.1 Unpacking Unit

Carefully unpack the equipment and make a visual inspection of the unit for evidence of damage incurred

during shipment. If the unit is damaged, notify the carrier and file a claim. To justify a claim, save the

original shipping container and all packing materials. Do not return the unit to Garmin until the carrier has

authorized the claim.

Retain the original shipping containers for storage. If the original containers are not available, a separate

cardboard container should be prepared that is large enough to accommodate sufficient packing material to

prevent movement.

3.2 Electrical Connections

All electrical connections to the GMA 245 are made through two 44-pin D-subminiature connectors (see

Figure 3-11). defines the electrical characteristics of all input and output signals. Required Section 4

connector and associated hardware are supplied in the connector kits. Refer to Section 2.3 for the

GMA 245 and GMA 245R standard kit part numbers that contain the necessary hardware. See

Appendix C for interconnect wiring diagrams.

CAUTION

Check wiring connections for errors before inserting the GMA 245 into the rack, or

connecting the GMA 245R. Incorrect wiring could cause internal component damage.

Table 3-1 Pin Contact Part Numbers

Manufacturer

44 pin D-Subminiature Connectors (P2401, P2402)

18-20 AWG

(Power and Ground Only) 22-28 AWG

Garmin P/N 336-00044-00* 336-00021-00

Military P/N N/A M39029/58-360

*Used for 18 AWG wire, is not included in the GMA 245/245R installation kits, and is not needed to

install the GMA 245/245R. GPN 336-00021-00 is used for 22 AWG wire and is included in the

GMA 245/245R installation kits. Use the 336-00044-00 if installing 18 AWG wire for Power and Ground.

190-01879-11 GMA 245/245R Installation Manual

Rev. 10 Page 3-2

NOTE

1. Non-Garmin part numbers shown are not maintained by Garmin and consequently are subject to

change without notice.

2. Extracting #18 and #20 contacts requires that the expanded wire barrel be cut off from the contact.

It may also be necessary to push the pin out from the face of the connector when using an extractor

due to the absence of the wire. A new contact must be used when reassembling the connector.

3.3 Jackscrew and Shield Block Backshell Installation Instructions

3.3.1 Backshell Installation Parts

Table 3-3 and Table 3-5 list the parts needed to install a Jackscrew Backshell (GMA 245R), the item

numbers in these tables correspond to Figure 3-1. Table 3-4 and Table 3-5 list the parts needed to install a

Shield Block Backshell (GMA 245). The item numbers in these tables correspond to Figure 3-2. Parts

listed in Table 3-5 are to be provided by the installer.

The items listed in Table 3-3 are provided in the GMA 245R Connector Kit (Table 2-9).

Table 3-2 Recommended Crimp Tools

Manufacturer

Hand

Crimping

Tool

18-20 AWG 22-28 AWG

Positioner

Insertion/

Extraction

Tool (Note 2)

Positioner

Insertion/

Extraction

Tool

Military P/N M22520/2-01 N/A M81969/1-04 M22520/2-09 M81969/1-04

Positronic 9507 9502-11 M81969/1-04 9502-3 M81969/1-04

AMP 601966-1 N/A 91067-1 601966-6 91067-1

Daniels AFM8 K774 M81969/1-04 K42 M81969/1-04

Astro 615717 N/A M81969/1-04 615725 M81969/1-04

Table 3-3 Parts supplied for a GMA 245R Jackscrew Backshell Installation ( )Figure 3-1

Item # Description GPN

1 Jackscrew Backshell 125-00173-00

6 Contact Pin, Mil Crimp, Size 22D 336-00021-00

8 Screw,8-32x.312,PHP,SS/P 211-60209-09

9 Wshr,Split Lock,Size 8 212-00018-04

10 Wshr,Flat,Non-Std,SS,ID.195,OD.354 212-20065-00

12 Clamp 115-01078-02

13 Screw,4-40x.375,PHP,SS/P,w/Nylon 211-60234-10

14 Cover 115-01079-02

15 Screw,4-40x.187,FLHP100,SS/P,w/Nylon 211-63234-06

16 Hi Density D-Sub Connector, Mil Crimp, 44 ckt 330-00185-44

190-01879-11 GMA 245/245R Installation Manual

Rev. 10 Page 3-3

The items listed in Table 3-4 are provided in the GMA 245 Connector Kit (Table 2-6 Table 2-7 and ).

NOTE

In Figure 3-1, “AR” denotes quantity “As Required” for the particular installation.

Table 3-4 Parts supplied for a GMA 245 Backshell Installation (Figure 3-2)

Item # Description GPN

1 Cast Backshell Housing 125-00083-00

6 Contact Pin, Mil Crimp, Size 22D 336-00021-00

8 Screw,8-32x.312,PHP,SS/P 211-60209-09

9 Wshr,Split Lock,Size 8 212-00018-04

10 Wshr,Flat,Non-Std,SS,ID.195,OD.354 212-20065-00

12 Clamp 115-00499-02

13 Screw,4-40x.375,PHP,SS/P,w/Nylon 211-60234-10

14 Cover 115-00500-02

15 Screw,4-40x.375,PHP,SS/P,w/Nylon 211-63234-06

16 Hi Density D-Sub Connector, Mil Crimp, 44 ckt 330-00185-44

17* Screw,4-40x.250,FLHP100,SS/P 211-63234-08

18* Adapter, Ring Terminal, Shell SZ 1,2 117-00147-00

19* Screw,4-40x.437,FLHP100, SS/P,Nylon 211-63234-11

*GMA 245 Shield Block Backshell only

Table 3-5 Parts not supplied for a Backshell Installation ( )Figure 3-1

Item # Description GPN or MIL spec

2Multiple Conductor Shielded Cable (2-conductor shown in

Figure 3-1)

Parts used depend on

method chosen

3 Drain Wire Shield Termination (method optional) Parts used depend on

method chosen

4Braid, Flat (19-20 AWG equivalent, tinned plated copper strands

36 AWG, Circular Mil Area 1000 -1300)

Parts used depend on

method chosen

5 Floating Shield Termination (method optional) Parts used depend on

method chosen

Ring terminal, #8, insulated, 18-22 AWG MS25036-149

Ring terminal, #8, insulated, 14-16 AWG MS25036-153

Ring terminal, #8, insulated, 10-12 AWG MS25036-156

11 Silicon Fusion Tape -

190-01879-11 GMA 245/245R Installation Manual

Rev. 10 Page 3-4

Figure 3-1 GMA 245R Jackscrew Backshell Assembly

190-01879-11 GMA 245/245R Installation Manual

Rev. 10 Page 3-6

3.3.2 Shield Termination Technique – Method A.1 (Standard)

NOTE

For the following steps please refer to Figure 3-1 Figure 3-2 or (as appropriate), and

Figure 3-3.

1. The appropriate number of Backshells will be included in the particular LRU connector kit.

Figure 3-3 Method A.1 for Shield Termination

2. At one end of a shielded cable (item 2, Figure 3-1 or ) measure a distance between Figure 3-2

“Window Min” to “Window Max” (Table 3-6) and cut a window (max size 0.35”) in the jacket to

expose the shield (item 4, Figure 3-3). Use caution when cutting the jacket to avoid damaging the

individual braids of the shield. When dealing with a densely populated connector with many

cables, it may prove beneficial to stagger the windows throughout the “Window Min” to “Window

Max” range. If staggering is not needed the “Ideal Window” length is recommended.

Suggested tools to accomplish the window cut:

• Coaxial Cable Stripper

• Thermal Stripper

• Sharp Razor Blade

Table 3-6 Shielded Cable Preparations for Garmin Connectors

Backshell-

Size

Number

of Pins

Std/HD

Float Min

(inches)

Float Max

(inches)

Ideal Float

(inches)

Window

Min

(inches)

Window

Max

(inches)

Ideal

Window

(inches)

44 Pin 44 1.5 2.5 2.0 3.0 5.5 4.5

190-01879-11 GMA 245/245R Installation Manual

Rev. 10 Page 3-7

3. Connect a Flat Braid (item 4, Figure 3-3) to the shield exposed through the window of the prepared

cable assembly (item 2, Figure 3-1 or Figure 3-2) from step 2. The Flat Braid should go out the

front of the termination towards the connector. It is not permitted to exit the rear of the termination

and loop back towards the connector (Figure 3-3). Make this connection using an approved shield

termination technique.

NOTE

FAA AC 43.13-1B Chapter 11, Section 8 (Wiring Installation Inspection Requirements)

may be a helpful reference for termination techniques.

Preferred Method:

Slide a solder sleeve (item 3, or ) onto the prepared cable assembly (item 2, Figure 3-1 Figure 3-2

Figure 3-1 or Figure 3-2) and connect the Flat Braid (item 4, Figure 3-3) to the shield using a heat

gun approved for use with solder sleeves. It may prove beneficial to use a solder sleeve with a pre-

installed Flat Braid versus having to cut a length of Flat Braid to be used. The chosen size of

solder sleeve must accommodate both the number of conductors present in the cable and the Flat

Braid (item 4, Figure 3-3) to be attached.

Solder Sleeves with pre-installed Flat Braid

A preferred solder sleeve would be the Raychem S03 Series with the thermochromic

temperature indicator (S03-02-R-9035-100, S03-03-R-9035-100, S03-04-R-9035-100). These

solder sleeves come with a pre-installed braid and effectively take the place of items 3 and 4,

Figure 3-3. For detailed instructions on product use, reference Raychem installation procedure

RCPS 100-70.

Raychem recommended heating tools:

•HL1802E

•AA-400 Super Heater

•CV-1981

•MiniRay

•IR-1759

Individual solder sleeves and Flat Braid

Solder Sleeves:

Reference the following MIL-Specs for solder sleeves.

(M83519/1-1, M83519/1-2, M83519/1-3, M83519/1-4, M83519/1-5)

Flat Braid:

If the preferred Raychem sleeves are not being used, the individual flat braid selected should

conform to ASTMB33 for tinned copper and be made up of 36 AWG strands to form an

approximately 19-20 AWG equivalent flat braid. A circular mil area range of 1000 to 1300 is

required. The number of individual strands in each braid bundle is not specified. (e.g.

QQB575F36T062)

NOTE

Flat Braid as opposed to insulated wire is specified in order to allow continuing air

worthiness by allowing for visual inspection of the conductor.

190-01879-11 GMA 245/245R Installation Manual

Rev. 10 Page 3-8

Secondary Method:

Solder a Flat Braid (item 4, Figure 3-3) to the shield exposed through the window of the prepared cable

assembly (item 2, Figure 3-1 or ). Ensure a solid electrical connection through the use of Figure 3-2

acceptable soldering practices. Use care to avoid applying excessive heat that burns through the

insulation of the center conductors and shorts the shield to the signal wire. Slide a minimum 0.75

inches of Teflon heat shrinkable tubing (item 3, Figure 3-3) onto the prepared wire assembly and

shrink using a heat gun. The chosen size of heat shrinkage tubing must accommodate both the number

of conductors present in the cable and the Flat Braid (item 4, Figure 3-3) to be attached.

Teflon Heat Shrinkable Tubing:

Reference the following MIL-Spec for Teflon heat shrinkable tubing (M23053/5-X-Y).

4. At the same end of the shielded cable (item 2, Figure 3-1 or Figure 3-2) and ahead of the previous

shield termination, strip back “Float Min” to “Float Max” (Table 3-6) length of jacket and shield to

expose the insulated center conductors (Figure 3-3). The “Ideal Float” length may be best to build

optimally.

Preferred Method:

The jacket and shield should be cut off at the same point so no shield is exposed. Slide 0.75 inches

minimum of Teflon heat shrinkable tubing (item 5, Figure 3-3) onto the cable and use a heat gun to

shrink the tubing. The chosen size of heat shrinkage tubing must accommodate the number of

conductors present in the cable.

Secondary Method:

Leave a max 0.35 inches of shield extending past the jacket. Fold this 0.35 inches of shield back

over the jacket. Slide a solder sleeve (item 5, Figure 3-3) over the end of the cable and use a heat

gun approved for solder sleeves to secure the connection. The chosen size of solder sleeve must

accommodate the number of conductors present in the cable.

5. Strip back approximately 0.17 inches of insulation from each wire of the shielded cable (item 2,

Figure 3-4) and crimp a contact (item 6, Figure 3-4) to each conductor. It is the responsibility of

the installer to determine the proper length of insulation to be removed. Wire must be visible in

the inspection hole after crimping and the insulation must be 1/64 – 1/32 inches from the end of

the contact as shown in Figure 3-4.

Figure 3-4 Insulation/Contact Clearance

190-01879-11 GMA 245/245R Installation Manual

Rev. 10 Page 3-9

NOTE

For the item numbers in the following steps 6-13 please refer to Figure 3-1 Figure 3-2, or

as appropriate.

6. Insert newly crimped pins and wires into the appropriate connector housing location as specified

by the installation wiring diagrams.

7. Cut the Flat Braid (item 4) to a length that, with the addition of a ring terminal, will reach one of

the tapped holes of the Jackscrew backshell (item 1). An appropriate amount of excess length

without looping should be given to the Flat Braid (item 4) to allow it to freely move with the wire

bundle.

NOTE

Position the window splice to accommodate a Flat Braid (item 4) length of no more than 4

inches.

8. Guidelines for terminating the newly cutoff Flat Braid(s) (item 4) with insulated ring terminals

(item 7):

• Each tapped hole on the Jackscrew Backshell (item 1) may accommodate only two ring

terminals (item 7).

• It is preferred that only two Flat Braid(s) (item 4) be terminated per ring terminal. Two Flat

Braids per ring terminal will necessitate the use of a Ring terminal, #8, insulated, 14-16

AWG (MS25036-153).

• If only a single Flat Braid is left or if only a single Flat Braid is needed for this connector a

Ring terminal, #8, insulated, 18-22 AWG (MS25036-149) can accommodate this single Flat

Braid.

• If more braids exist for this connector than two per ring terminal, it is permissible to

terminate three braids per ring terminal. This will necessitate the use of a Ring terminal, #8,

insulated, 10-12 AWG (MS25036-156).

9. Repeat steps 2 through 8 as needed for the remaining shielded cables.

10. Terminate the ring terminals to the Jackscrew Backshell (item 1) by placing items on the Pan Head

Screw (item 8) in the following order: Split Washer (item 9), Flat Washer (item 10) first Ring

Terminal, second Ring Terminal (if needed) before finally inserting the screw into the tapped

holes on the Jackscrew Backshell. Do not violate the guidelines presented in Step 8 regarding ring

terminals.

11. It is recommended to wrap the cable bundle with Silicone Fusion Tape (item 11)

(GPN: 249-00114-00 or a similar version) at the point where the backshell clamp and cast housing

will contact the cable bundle.

NOTE

Choosing to use this tape is the discretion of the installer.

12. Place the smooth side of the backshell clamp (item 12) across the cable bundle and secure using

the three screws (item 13). Warning: Placing the grooved side of the clamp across the cable

bundle may risk damage to wires.

13. Attach the cover (item 14) to the backshell (item 1) using the two screws (item 15).

190-01879-11 GMA 245/245R Installation Manual

Rev. 10 Page 3-10

3.3.3 Shield Termination Technique - Method A.2 (Daisy Chain)

In rare situations where more braids need to be terminated for a connector than three per ring terminal it is

allowable to daisy chain a maximum of two shields together before coming to the ring terminal

(Figure 3-5). All other restrictions and instructions for the shield termination technique set forth for

Method A.1 are still applicable.

NOTE

The maximum length of the combined braids should be approximately 4 inches.

Figure 3-5 Method A.2 (Daisy Chain) for Shield Termination

190-01879-11 GMA 245/245R Installation Manual

Rev. 10 Page 3-11

3.3.4 Shield Termination – Method B.1 (Quick Term)

If desired, the drain wire termination (item 3, Figure 3-5) and the floating shield termination (item 5,

Figure 3-5) can be effectively combined into a “Quick Term”. This method eliminates the float in the

cable insulation and moves the placement of the window which was described by the dimensions “Window

Min” and “Window Max” from Method A. This technique is depicted in Figure 3-6.

NOTE

The original purpose for separating the shield drain termination (item 3, Figure 3-5) from

the float termination (item 5, Figure 3-5) in Method A was to allow for a variety of lengths

for the drain wires so that the shield drain terminations (item 3, Figure 3-5) would not all

“bunch up” in the harness and to eliminate loops in the drain wires. If Method B is

chosen, as described in this section, care must be taken to ensure that all drain shield

terminations can still be inspected. With connectors which require a large number of

shield terminations it may be best to use Method A. This will allow the drain shield

terminations (item 3, Figure 3-5) a larger area to be dispersed across.

Using this method, the instructions from Section 3.3.2 (Method A) are followed except that:

1. Step 2 is eliminated

2. Steps 3 and 4 are replaced by the following:

At the end of the shielded cable (item 2, Figure 3-1 or Figure 3-2), strip “Quick Term Min” to

“Quick Term Max” (Table 3-7) length of the jacket to expose the shield. Next trim the shield so

that at most 0.35 inches remains extending beyond the insulating jacket. Fold this remaining

shield back over the jacket.

Connect a Flat Braid (item 4, Figure 3-1 or ) to the folded back shield of the prepared Figure 3-2

cable assembly. The flat braid should go out the front of the termination towards the connector. It

is not permitted to exit the rear of the termination and loop back towards the connector

(Figure 3-6). Make this connection using an approved shield termination technique.

NOTE

FAA AC 43.13-1B Chapter 11, Section 8 (Wiring Installation Inspection Requirements)

may be a helpful reference for termination techniques.

Preferred Method:

Slide a solder sleeve (item 3, or ) onto the prepared cable assembly (item 2, Figure 3-1 Figure 3-2

Figure 3-1, or ) and connect the Flat Braid (item 4, or ) to the shield Figure 3-2 Figure 3-1 Figure 3-2

using a heat gun approved for use with solder sleeves. It may prove beneficial to use a solder sleeve

with a pre-installed Flat Braid versus having to cut a length of Flat Braid to be used. The chosen size

of solder sleeve must accommodate both the number of conductors present in the cable and the Flat

Braid (item 4, Figure 3-1 or ) to be attached.Figure 3-2

NOTE

Reference for recommended solder sleeves and flat braid. The same Section 3.3.2

recommendations are applicable to this technique.

190-01879-11 GMA 245/245R Installation Manual

Rev. 10 Page 3-13

3.3.5 Shield Termination-Method B.2 (Daisy Chain-Quick Term)

In rare situations where more braids need to be terminated for a connector than three per ring terminal it is

allowable to daisy chain a maximum of two shields together before coming to the ring terminal

(Figure 3-7). All other restrictions and instructions for the shield termination technique set forth for

Method B.1 are still applicable.

NOTE

The maximum length of the combined braids should be approximately 4 inches.

Figure 3-7 Method B.2 (Daisy Chain-Quick Term) for Shield Termination

190-01879-11 GMA 245/245R Installation Manual

Rev. 10 Page 3-14

3.3.6 Daisy Chain between Methods A and B

In rare situations where more braids need to be terminated for a connector than three per ring terminal and

a mixture of Methods A and B have been used, it is allowable to daisy chain a maximum of two shields

together from a Method A termination to a Method B (Figure 3-8). All other restrictions and instructions

for the shield termination technique set forth for Method A and B are still applicable.

NOTE

The maximum length of the combined braids should be approximately 4 inches.

Figure 3-8 Daisy Chain between Methods A and B

3.3.7 Splicing Signal Wires

Refer to Figure 3-9 for GMA 245R installations, or to Figure 3-10 for GMA 245 installations.

NOTE

Figure 3-9 and Figure 3-10 illustrate that a splice must be made within a 3 inch window

from outside the edge of clamp to the end of the 3 inch max mark.

WARNING

Keep the splice out of the backshell for pin extraction, and outside of the strain relief to

avoid preloading.

Figure 3-9 and Figure 3-10 show a two wire splice, but a maximum of three wires can be spliced. If a third

wire is spliced, it is located out front of splice along with signal wire going to pin.

Splice part numbers:

•Raychem D-436-36/37/38

•MIL Spec MIL-S-81824/1

This technique may be used with shield termination methods: A.1, A.2, B.1, B.2, C.1 and C.2.

190-01879-11 GMA 245/245R Installation Manual

Rev. 10 Page 3-15

Figure 3-9 Jackscrew D-Sub Spliced Signal Wire illustration

190-01879-11 GMA 245/245R Installation Manual

Rev. 10 Page 3-16

Figure 3-10 Shield Block D-Sub Spliced Signal Wire illustration

0.75 inches MIN.

SHRINKABLE

TUBING

END OF SHIELD BLOCK

4 inches MAX.

0.35 inches MAX.

WINDOW SIZE

SLEEVE EDGE

EDGE OF STRAIN RELIEF

OUTER EDGE OF SPLICE

3 inches MAX.

SPLICE

OUTER SOLDER

Produktspezifikationen

Marke:	Garmin
Kategorie:	Hi-Fi-Anlage
Modell:	GMA 245R

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