Garmin GMA 240 Pilot's Guide
Contents
1. 44 0870 8501241 f 44 0870 8501251 Garmin Corporation No 68 Jangshu 2nd Road Shijr Taipei County Taiwan p 886 2 2642 9199 f 886 2 2642 9099 www garmin com 2008 Garmin Ltd or its subsidiaries 190 00917 00 Rev A2. GMA 240 Pilot s Guide A GARMIN Copyright 2008 Garmin Ltd or its subsidiaries All rights reserved This manual reflects the operation of GMA 240 units with mod level 0 or later Some differences in operation may be observed when comparing the information in this manual to earlier or later Mod status levels Garmin International Inc 1200 East 151st Street Olathe Kansas 66062 U S A Tel 913 397 8200 Fax 913 397 8282 Garmin AT Inc 2345 Turner Road SE Salem OR 97302 U S A Tel 503 391 3411 Fax 503 364 2138 Garmin Europe Ltd Liberty House Bulls Copse Road Hounsdown Business Park Southampton S040 ORB U K Tel 44 0870 8501241 Fax 44 0870 8501251 Garmin Corporation No 68 Jangshu 2nd Road Shijr Taipei County Taiwan Tel 886 02 2642 9199 Fax 886 02 2642 9099 Web Site Address www garmin com 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 written permission 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 for personal use 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
3. ILOT PILOT ISO Selected CREW When Crew Isolation is configured Selected Radios Selected Radios Alerts Telephone Alerts Telephone Passengers and PILOT ISO Pilot Copilot Copilot Pilot Music is selected wisi nee A configuration option can allow music for these positions ICS Isolation Modes amp Telephone Distribution TELEPHONE The GMA 240 provides a full duplex telephone interface Press the TEL Key to activate telephone operation When the telephone is active operation depends on the ICS mode See the ICS Isolation Modes amp Telephone Distribution table Telephone communication is much like using the intercom allowing both parties to talk at once 190 00917 00 Rev A Garmin GMA 240 Pilot s Guide 9 A GMA 240 Audio Panel GARMIN ENTERTAINMENT INPUTS The GMA 240 provides two stereo entertainment inputs MUSIC 1 and MUSIC 2 A MUSIC 1 TEL jack is also located on the GMA 240 front panel The MUSIC 1 TEL jack can accept music or telephone sources The MUSIC 1 and MUSIC 2 rear inputs may be wired to either a stereo phone jack in a convenient place or to an audio device in a fixed mount e g a GPSMAP 396 dock or a CD player These inputs are compatible with popular portable entertainment devices such as MP3 and CD players The headphone outputs of these devices are plugged into the MUSIC 1 or MUSIC 2 jacks Press the MUSIC Key to enable the selected music input to be heard Press again to disable musi
4. RANSCEIVERS Pressing COM MIC or COM2 MIC Key selects the transmitter and receiver audio for the selected transceiver source The active COM audio is always heard on the Pilot headphones Audio level is controlled by the selected COM radio volume control Either audio source can be selected independently by pressing the COM1 or COM2 receiver keys When selected this way they remain active as audio sources regardless of which transceiver has been selected for microphone use 190 00917 00 Rev A Garmin GMA 240 Pilot s Guide 7 GMA 240 Audio Panel GARMI N When a microphone is keyed the active transceivers MIC key LED blinks approximately once per second indicating the PTT is pressed RECEIVERS Pressing the NAV1 NAV2 AUX1 or AUX2 Key selects the receiver audio for the selected source Each audio source can be selected independently by pressing the appropriate receiver keys They remain active as audio sources until deselected Press the MON MUTE Key to mute all monitored receiver audio when the active transceiver is receiving audio INTERCOM The GMA 240 includes a four position intercom system ICS with electronic cabin noise de emphasis and two stereo music inputs Two volume controls one for the Pilot and one for a combined Copilot passenger control set intercom audio level Music volume is controlled by pulling the right side Copilot passenger volume control knob and turning it for the desired audio level ICS sq
5. c audio Press the MUSIC 1 2 Key to select either the MUSIC 1 or MUSIC 2 input Annunciators above the key indicate which music source is selected Either music source may be selected The selected source is heard by all unless intercom isolation removes the audio A music source plugged into the GMA 240 front panel MUSIC 1 jack will bypass the MUSIC 1 rear input MUSIC is soft muted under certain conditions Soft muting refers to the temporary reduction of music volume and a gradual return to its original level This muting occurs during alerts unless configured otherwise during selected radio reception if the RADIO Key is selected during intercom operation if the ICS Key is selected and any time the TEL Key is selected 10 Garmin GMA 240 Pilot s Guide 190 00917 00 Rev A GARMIN GMa 240 Audio Panel GMA 240 PROGRAMMING OPTIONS Programming options include variable configurations that can be arranged by a Garmin authorized service center Some options include a Pilot operable pushbutton or toggle switch or might be fixed configurations that are unchangeable Configurations include the following e COM Swap A remote mounted pushbutton is used to transfer the active microphone between COM1 MIC and COM2 MIC COM muting on transmit Audio on the other selected radios is muted while the active transceiver is transmitting Deactivate MASQ master avionics squelch Enables disables master squelch The threshold level of MASQ i
6. ch Pulling the right volume knob small knob controls music volume pushing in controls Copilot and passenger volume The large right knob controls Copilot and passenger squelch 4 Garmin GMA 240 Pilot s Guide 190 00917 00 Rev A A GARMIN COM1 COM2 Com1 f com2 MIC f MIC 190 00917 00 Rev A GMA 240 Audio Panel COM receiver keys Pressing a COM receiver key selects the receiver which is heard in addition to the selected transceiver Pressing again deselects the receiver Transceiver selection keys Pressing a COM transceiver key selects the COM transmitter and associated receiver One of the transceivers is always selected as active Monitor Mute key Mutes all other monitored receivers when the active transceiver receives audio Telephone key Pressing the TEL Key selects the Telephone interface Pressing again deselects the telephone NAV receiver and AUX keys Pressing a key selects the Nav receiver or AUX audio input Pressing again deselects the audio Master Music key Pressing the MUSIC Key allows the selected music input to be heard Pressing again deselects music Music Source 1 or 2 selection key and Music Source Annunciators Selects Music input 1 or 2 LED 1 or 2 iluminates to indicate which input is selected Music 1 TEL jack External music device or telephone input ICS Key When selected music is muted during Intercom operation RADIO Key When selected music is mu
7. engers cannot transmit over the active COM radio even if equipped with a PTT switch Each microphone input has a dedicated VOX circuit to ensure that only the active microphone is heard when squelch is broken 6 Garmin GMA 240 Pilot s Guide 190 00917 00 Rev A GARMIN GMA 240 Audio Panel MONO STEREO HEADSETS The unit can accommodate up to four 4 headsets Pilot Copilot and up to two 2 passengers The use of stereo headsets is highly recommended If monaural headsets are plugged into stereo jacks power supply fuses may be damaged When wired correctly the use of a monaural headset in a stereo jack shorts the right headset channel to ground Anyone listening on a monaural headset hears only the left channel in both ears If a monaural headset is used at one of the passenger positions anyone else listening on a stereo headset hears audio in the left ear only unless their headset has a mono stereo switch set to mono POWER ON OFF The GMA 240 may be powered ON and OFF with the avionics master switch The unit may also be turned ON and OFF with the Pilot ICS Volume Knob Rotate the knob clockwise out of the detent to turn ON Rotate the knob counterclockwise into the detent to turn OFF During power up the unit undergoes a self test illuminating all panel annunciator lights for about two 2 seconds Once the self test is complete the unit is ready for use with the same keys selected as when the system was last powered OFF T
8. manual or any revision hereto is strictly prohibited Garmin is a registered trademark of Garmin Ltd or its subsidiaries These trademarks may not be used without the express permission of Garmin June 2008 190 00917 00 Rev A Printed in the U S A LIMITED WARRANTY This Garmin product is warranted to be free from defects in materials or workmanship for one year from the date of purchase Within this period Garmin will at its sole option repair or replace any components that fail in normal use Such repairs or replacement will be made at no charge to the customer for parts and labor provided that the customer shall be responsible for any transportation cost This warranty does not cover failures due to abuse misuse accident or unauthorized alterations or repairs THE WARRANTIES AND REMEDIES CONTAINED HEREIN ARE EXCLUSIVE AND IN LIEU OF ALL OTHERWARRANTIES EXPRESS OR IMPLIED OR STATUTORY INCLUDING ANY LIABILITY ARISING UNDER ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE STATUTORY OR OTHERWISE THIS WARRANTY GIVES YOU SPECIFIC LEGAL RIGHTS WHICH MAY VARY FROM STATE TO STATE IN NO EVENT SHALL GARMIN BE LIABLE FOR ANY INCIDENTAL SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES WHETHER RESULTING FROM THE USE MISUSE OR INABILITY TO USE THIS PRODUCT OR FROM DEFECTS IN THE PRODUCT Some states do not allow the exclusion of incidental or consequential damages so the above limitations may not apply to you Garmin
9. retains the exclusive right to repair or replace the unit or software or to offer a full refund of the purchase price at its sole discretion SUCH REMEDY SHALL BE YOUR SOLE AND EXCLUSIVE REMEDY FOR ANY BREACH OF WARRANTY To obtain warranty service contact your local Garmin Authorized Service Center For assistance in locating a Service Center near you visit the Garmin Web site at http www garmin com or contact Garmin Customer Service at 800 800 1020 CAUTION Incorrect aircraft wiring could short the left channel or both channels to ground if a monaural headset is plugged into the stereo jacks If wired incorrectly fail safe operation will not work CAUTION If monaural headsets are plugged into stereo jacks power supply current increases which may cause power supply fuse damage GMA 240 Audio Panel GARMI N Pilot s Squelch Knob Copilot Passenger ON OFF Squelch Knob and Pilot s Volume Krop Copilot Passenger Music Volume Knob Music On Com Receiver Monitor Mute Nav Receiver and Off Key Keys Key AUX Audio Keys GARMIN a _ Fa ma GMA 240 NAV1 NAV2 AUX1 AUX2 COPILOT Music 1 or2 _ Transceiver Telephone PilotiCS Intercom Music Audio Select Key Selection Keys Key Isolation Mute Key and or Telephone Key ae Mute Input Jack ey Volume Squelch Rotating the Pilot Volume Knob left small knob controls the ON and OFF function Full CCW detent is OFF The large left knob controls Pilot squel
10. s also adjustable Internal Sidetone Enables disables internal sidetone for radios that do not provide sidetone during transmission This can be selected independently for COM1 COM2 and TEL Crew Isolation ICS isolation for the crew in place of Pilot isolation PILOT ISO Music Enable music audio to be heard by the Pilot during PILOT ISO mode Button Press Tone Enable beep tone annunciation of button presses Alert Music Mute Disable music interruption by alert audio Default operation is recommended Jack TEL detect Phone detection is bypassed Audio panel assumes a telephone is plugged into the jack whenever the TEL Key is selected Music mute by primary COM only When RADIO Key is selected music is muted only when active COM is receiving audio Enable Keyed ICS Intercom MIC audio heard only when the corresponding ICS Key for the MIC position is pressed Individual volume controls The volume can be adjusted individually for each alert input the rear connector pin TEL audio input and the front accessory jack TEL audio input 190 00917 00 Rev A Garmin GMA 240 Pilot s Guide 11 A GARMIN Garmin International Inc 1200 East 151st Street Olathe KS 66062 U S A p 913 397 8200 f 913 397 8282 Garmin AT Inc 2345 Turner Road SE Salem OR 97302 U S A p 503 391 3411 f 503 364 2138 Garmin Europe Ltd Liberty House Bulls Copse Road Hounsdown Business Park Southampton S040 ORB U K p
11. ted during reception of selected aircraft radios Garmin GMA 240 Pilot s Guide 5 GMA 240 Audio Panel GARMI N FEATURES AND OPERATION The Garmin GMA 240 is a headphones only audio control panel Pushbutton keys control audio selection of COM NAV telephone TEL and intercom Two AUX inputs are available for additional avionics or audio devices LED annunciators indicate when a key function is selected Annunciator brightness is adjusted automatically by photocell dimming LED illuminated key brightness is adjusted by the radio dimming bus control In case power is interrupted or the unit is turned off a fail safe circuit connects the Pilots headset microphone and PTT directly to COM 1 and the fail safe alert audio such as an autopilot disconnect tone In addition to radio squelch circuitry MASQ Master Avionics Squelch processing further reduces ambient noise from the avionics inputs Upon installation the unit may be configured in various ways depending on the aircraft type and the needs of the Pilot See the configuration list at the end of this manual Contact a Garmin authorized service center for details and assistance in altering the configuration settings MICROPHONES The GMA 240 Audio Panel can accept up to four 4 microphone inputs allowing for a two person crew and up to two 2 passenger intercom stations in the aircraft A push to talk PTT switch must be pressed to transmit on a selected Transceiver The pass
12. uelch is adjusted by turning the Pilot side and Copilot passenger side SQ knob Turning either knob clockwise increases the squelch threshold level turning counterclockwise decreases the level The intercom system provides two modes of isolation PILOT and ALL controlled by pressing the PILOT ISO Key In Pilot mode PILOT ISO annunciator is illuminated the Pilot is isolated from all other occupants of the aircraft In ALL mode PILOT ISO annunciator is off everyone hears all occupants of the aircraft The unit can also be configured for Crew Isolation in place of Pilot Isolation When configured for Crew Isolation the Pilot and Copilot can communicate with each other while the passengers are able to communicate only with each other In ALL mode there is no isolation and every occupant can communicate with every other occupant 8 Garmin GMA 240 Pilot s Guide 190 00917 00 Rev A GARMIN GMA 240 Audio Panel Press the ICS Key to mute the music during intercom operation Press the PILOT ISO Key for Pilot or Crew isolation depending on configuration Mode Pilot Hears Copilot Hears Selected Radios Selected Radios Selected Radios Alerts Telephone Alerts Telephone Alerts Telephone Pilot Copilot Copilot Pilot Pilot Copilot Passengers Music Passengers Music Passengers Music ALL PILOT ISO not Selected Selected Radios Copilot Copilot Alerts Telephone Passengers Passengers Pilot Music Music Music P
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