Garmin GMA 350H Installation Manual - Page 27
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3. Verify that each installed transceiver keys for transmission and transmits clear audio
from the pilot's mic when selected for transmission and the Pilot PTT key is pressed.
(Because the audio panel can be configured to simulate received sidetone internally,
verifying transmission with a separate radio not in the system is recommended.)
Depending on configuration and sometimes COM system wiring, other
transceivers may be muted during transmit. Also, the audio panel may mute
the speaker during PTT.
4. Move the headset to the copilot's headset jacks and verify that any one of the
installed transceivers (testing each is not necessary) receives and transmits copilot
mic properly as above.
3.8.3 Verify Audio from Installed Receiver and Alert Sources
1. Connect a headset to the pilot's headset output and mic input jack (depending on
configuration and ICS mode, copilot or passenger positions may not hear all of these
sources).
2. Verify each installed receiver (NAV/ADF/DME) can be heard when selected (use test
signal generators/transmitters when necessary).
3. Verify each installed unswitched (alert) source can be heard when the source is
instructed to play a simulated alert/message.
3.8.4 Verify Speaker Output (if installed)
1. Select the speaker output and verify any one transceiver or receiver is heard clearly.
2. Verify that any one unswitched (alert) source is heard clearly in the speaker
(depending on configuration, these may be heard in the speaker regardless of speaker
selection).
3. Initiate PA (Passenger Address) mode and verify that from both the pilot and copilot
position the crew position that is pressing PTT has their mic delivered to the speaker
clearly.
If a loud squeal is heard while testing PA, it is because there is too much
acoustic feedback between the speaker and the mic. If they cannot be placed
further apart, a lower volume configuration should be used.
installations, there is insufficient distance between the speaker and crew seat
positions for PA to speaker to reliably operate. In these conditions, the "PA to
speaker" volume can be set very low and PA audio will still be delivered to
the headsets.
GMA 350/350H Installation Manual
190-01134-11
The document reference is online, please check the correspondence between the online documentation and the printed version.
NOTE
NOTE
In some
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