Table of Contents
Advertisement
When switching from C
OM
switched off. In essence, switching the mic selector will not effect the selection of Com receiver audio.
When the duplex enable, or TELEPHONE mode is implemented during installation, Com 3 becomes the
"TEL" position. This is the pilot's "hook" switch, when the system is interfaced to an appropriate ap-
proved wireless telecommunication system, such as the AirCell system. Selecting Com 3 for transmit
places the pilot microphone and headphones on the cell phone. The pilot PTT will switch the pilot mic to
the other selected com transceiver, and allow continued aircraft communications to continue.
The copilot will also be able to transmit on the other selected radio with his PTT as well.
NOTE: Placing the mic selector switch in the COM 3 –TEL– mode will disable pilot and copilot inter-
com, as the intercom circuit is transferred to the telephone use. In crew or ISO mode, placing the switch
in TEL mode removes the passengers' access to the telephone.
3.3.1
Swap Mode (Switch from Com 1 to Com 2 remotely)
With a yoke mounted, momentary switch, the pilot can change from the current Com transceiver to the
other by depressing this switch. To cancel "Swap Mode," the pilot may either press the yoke mounted
switch again, or select a different Com with the XMT buttons. .
3.4
Audio Selector
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 illumi-
nated. Push buttons labeled Nav 1, Nav 2, MKR (Marker), ADF, DME, 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 be in the "off" position and remove that receiver from the
audio.
3.4.1
Speaker Amplifier
"SPR" 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 regard-
less of the speaker button position.
3.4.1.1
Public Address Function
To access PA function, a switch is installed to connect the top connector, pin 18, to ground. This places
the pilot microphone on the speaker output (Pin W) 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.
3.5
Split Mode
The split mode can be activated at any time by pressing the desired combination of XMT buttons. For in-
stance, to activate a Com 1/Com 2 split, press and hold the Com 1 button, and then press the Com 2 but-
ton while holding the Com 1 button. This places the pilot on Com 1 and the Copilot on Com 2.
Split mode for Com 3 is possible with pilot on Com 1, copilot on Com 2 or 3, if telephone is not enabled.
Pilot on Com 2 or Com 3 and Copilot on Com 1 is not possible.
D201106000060
Bendix/King
KMA 28B Audio Selector Panel and Intercom System
Installation and Operator's Manual
1 to C
2 while Com 2 has NOT been selected, Com 1 audio will be
OM
Page 3-2
June 2011
Advertisement
Table of Contents
