Garmin GMA 340 - Manual (Page 5)

5
Com Swap Function
The GMA 340 allows the use of a remote mounted switch (typically on the yoke) to alternately
transfer the active microphone back and forth between COM 1 and COM 2. Pressing the remote switch
will have no affect if COM 3 is the active transceiver. Ask your installing agency for details.
Aircraft Radios & Navigation
Audio level is controlled by the selected NAV radio volume control.
Pressing NAV 1, NAV 2, DME, ADF 1, ADF 2(16), or MKR (2) (see MKR Beacon Receiver, page 8)
selects each audio source. A second button press deselects the audio.
In addition, the GMA 340 provides inputs for an unswitched aircraft radio (TEL RINGER) and an
unmuted, unswitched aircraft radio (ALT WRN).
Speaker Output
Pressing the SPKR button (12) selects aircraft radios over the cabin speaker. The speaker output is
muted when a COM microphone is keyed. The GMA 340 speaker output level can be adjusted by your
installing agency.
PA Function
The PA mode is activated by pressing the PA button (11). Then, when either the pilot’s or copilot’s
microphone is keyed, the corresponding mic audio is heard over the cabin speaker. If the SPKR button is
also active, then any selected speaker audio is muted while the microphone is keyed. The SPKR button
does not have to be previously active in order to use the PA function. Pilot and copilot PA microphone
speaker levels are adjustable by your installing agency.
Auxiliary Entertainment Inputs
The GMA 340 and 340H provide two stereo entertainment inputs: MUSIC 1 and MUSIC 2. The 340
Dual ADF has only MUSIC 1. MUSIC 1 is soft-muted during all aircraft radio activity and normally
during ICS activity. MUSIC 2 is a non-muted input. These inputs are compatible with popular portable
entertainment devices such as cassette tape or CD players. The headphone outputs of these devices are
used and plugged into MUSIC 1 or MUSIC 2. Two 3.5 mm stereo phone jacks should be installed in a
convenient location for this purpose. MUSIC 1 and MUSIC 2 have characteristics that are affected by the
active intercom mode. Refer to the table on page 7.
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