On Tue, 22 Nov 2005 12:52:50 -0500, "Peter R."
wrote in ::

Larry Dighera wrote:

That's not what it says he
http://www.garmin.com/products/gma347/

The GMA 347 audio panel builds upon the successful attributes of
the GMA 340
snip

The GMA340 certainly has this feature.

Indeed page 4 of the Gramin GMA340 audio panel Pilot's Guide documents
Split COM operation.* I wouldn't have thought the COM receiver would
possess adequate selectivity to prevent adjacent channel splatter when
the receiving and transmitting antennas are in such close proximity.


*
http://www.garmin.com/manuals/GMA340...ilotsGuide.pdf

Transceivers

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Audio level is controlled by the selected COM radio volume control
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Selection of either COM1, COM2, or COM3 (13) for both MIC and
audio source is accomplished by pressing either COM1 MIC, COM2 MIC, or
COM3 MIC (14). The active com audio is always heard on the
headphones.

Additionally, each audio source can be selected independently by
pressing COM1, COM2, or COM3 (13). When selected in this way, they
remain active as audio sources regardless of which transceiver has
been selected for microphone use.

When a microphone is keyed, the active transceiver's MIC button
LED blinks approximately once per second to indicate that the radio is
transmitting.

Split COM 9Not Available on Dual ADF)
-------------------------------------

Pressing the COM1/2 button (15) activates the Split COM function.
When this mode is active, COM1 is dedicated solely to the pilot for
MIC/audio while COM2 is dedicated to the copilot for MIC/audio. The
pilot and copilot can simultaneously transmit in this mode over
separate radios. Both pilots can still listen to COM3, NAV1, NAV2,
DME., ADF, and MKR as selected. The Split COM mode is cancelled by
pressing the COM 1/2 button a second time.

When in the Split COM mode the copilot ma make PA announcements
while the pilot continues using COM1 independently. When the PA
button is pressed after the Split COM mode is activated, the copilot's
mic is output over the cabin speaker when keyed. A second press of
the PA button returns the copilot to normal Split COM operation.

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If the COM radios utilize a "transmit interlock" system, the Split COM
function may require that the feature is enabled. Refer to the
radio's installation manual for guidance. GARMIN makes no
expressed of implied guarantees regarding the suitability of Split COM
feature in a given installation.
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