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1.4 Audio Selector (All models)
Receiver audio is selected through seven momentary, push-button, backlit
switches. You will always
hear the audio from the transceiver that is selected for
transmit.
The users can identify which receivers are
selected by noting which of the green
switch LEDs are illuminated. Push buttons
labeled Nav 1, Nav 2, MKR (Marker),
AUX (auxiliary), and SPR (Speaker) are
"momentary type switches. When one of
these buttons is pressed, be active, and the LED will illuminate. Press the switch
again and it will be in the "off" position and remove that receiver from the audio.
If the aircraft is equipped with a DME or ADF, these audio sources can be
selected with the AUX button.
1.4.1 Speaker Amplifier
The "SPR" in the push-button section stands for speaker. This switch will place
all selected audio on the cockpit speaker when this switch is selected. NOTE:
Except for the unswitched audio, the speaker amplifier is not active in the "Split
Mode."
Unswitched audio, (autopilot disconnect, altimeter warning, etc.) will come
through the speaker regardless of the speaker button position.
1.4.1.1 Public Address Function
To access PA function, an external switch must be installed, and activated. This
places the pilot microphone on the speaker output when the PTT is pushed. The
copilot can continue to use the selected com radio.
We recommend that the switch transfer the audio from the cockpit speaker to a
cabin speaker for public address. This will prevent feedback.
1.4.2 Key “Click”
The SL15-CD is equipped with a “click” function that provides an aural feedback
to the user in addition to the tactile button push. This sound can be enabled or dis-
abled by simultaneously holding the COM 1 and COM 2 buttons in for at least 5
seconds. Any person hearing the radios will also hear the key click.
Allow at least 20 seconds between turning the key click on and off.