Northern Airborne Technology AMS42 - Manual (Page 56)

AMS42/44 Dual Channel Audio Controller Manual SM19 Rev. 4.00
Page 3-2 Nov 21, 2003
ENG-FORM: 806-0102.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
3.3 AMS42 - Selection of Transmit Functions
Left User (Co-pilot)
Transmit Selector Transmit
Annunciator
Right User (Pilot)
Transmit Selector
Transmit
Annunciator
3.3.1 Transmit
Selectors
The transmit selector controls are six position rotary switches, one on each side of the
panel to correspond to the user on that side of the aircraft. The controls select the
transmit function required by the relevant user. Each rotary selector switch is
completely independent of the other, and the pilot and copilot have equal priority during
transmit. When the PTT is activated, all audio selected on the side of the controller that
is transmitting is muted, except the sidetone of the transceiver in use.
3.3.1.1 Automatic Receive Audio
Receive audio is automatically selected as a function of the respective rotary selector
switch. No additional switching is needed to establish external communication.
3.3.1.2 Transmit Annunciators
During transmit from either the pilot or copilot position, the appropriate TX annunciator
(green) will light on the front panel.
3.3.1.3 TX Selector Example
In the figure above, the positions of the rotary selector switches indicate that the right side
of the controller is set for transmit and receive operation on the COM2 transceiver while
the left side of the controller is set for transmit and receive operation on the FM1
transceiver.
3.3.2 Hand Microphone
The hand mic functions without power and will work in emergency or equipment failure
situations. The hand mic normally functions on the left side of the controller but can be
connected to the right side at the time of installation by changing an internal switch. When
the hand mic or transmit PTT switch is activated, the mic involved will be coupled to the
radio (or PA) selected. The TX annunciator will not light when the hand mic is used.