AMS42/AMS44 Dual Channel Audio Controller
SM19 Installation and Operation Manual
May 29, 2012 Rev: 5.00
Page 3-5
ENG-FORM: 806-0100.DOTX
CONFIDENTIAL AND PROPRIETARY TO ANODYNE ELECTRONICS MANUFACTURING CORP.
3.5.1
ICS Modes of Operation
Intercom system (ICS) audio may be implemented in three modes between users;
LIVE
(on constantly),
VOX
(voice activated), or
KEYED
(active only when switched by ICS PTT switch). The ICS mode is
selected by the
ICS
Mode control (see below). It is common to use the
LIVE
mode during ground
operations, start-up, etc. and to use
VOX
or
KEYED
operation if conditions are so noisy that ‘pilot fatigue’
will result.
ICS Mode Control
ICS mode selection is made by positioning the ICS Mode control for the desired operation.
KEYED ICS
(PTT Operation)
*
ICS Mode Control set fully counter-clockwise into the switch detent.
LIVE
(Hot Mic Operation)
ICS Mode Control set fully clockwise.
VOX
(Voice Activated)
ICS Mode Control set fully clockwise, then slowly rotated counter-clockwise until the intercom just
becomes ‘quiet’. This setting will vary with ambient noise conditions, and the quality and number
of microphones connected in the system.
*
KEYED operation is inherent to the pilot and copilot microphone circuits only.
3.5.2
Passenger ICS Operation
Passenger ICS audio is LIVE when the controller is in the
LIVE
or
KEYED
mode of ICS operation and are
VOX triggered when a VOX setting is selected.
Note that the passengers are always LIVE unless
interrupted by an in-line PTT cord, or the controller is set for VOX operation.
Passenger and copilot (observer) operations can be maximized by using PTT type cord assemblies
designed for use with AEM audio controllers.
CAUTION: Ensure that all PTT type cord assemblies have properly shielded mic and phone wiring, or
‘crosstalk’ will occur.