User manual GARMIN GMA 240 PILOT'S GUIDE

[. . . ] 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. [. . . ] 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 Pilot's 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, MASQTM (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 passengers 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 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. TrANsCeIvers Pressing COM1 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. [. . . ] ·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 Garmin International, Inc. 1200 East 151st Street Olathe, KS 66062, U. S. A. p: 913. 397. 8200 f: 913. 397. 8282 Garmin AT, Inc. [. . . ]