AA95-766 Single Channel Audio Controller
SM95-766 Installation and Operation Manual
June 20, 2012 Rev: 3.00
Page 3-3
ENG-FORM: 806-0100.DOTX
CONFIDENTIAL AND PROPRIETARY TO ANODYNE ELECTRONICS MANUFACTURING CORP.
3.3.3 ICS
Functions
Intercom audio may be implemented in three modes: LIVE (on constantly), VOX (voice activated), or
KEYED (active only when switched by ICS PTT cyclic or foot switch).
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.
LIVE
(Hot Mic Operation)
ICS mode switch (orange switch bat) set to the up (VOX) position and the VOX squelch control
set to the full counter-clockwise position.
KEYED ICS
(PTT Operation)
ICS toggle switch (orange switch bat) set to the down (KEY) position. Keyed ICS is inherent to
the pilot and copilot microphone circuits only. Passenger microphone circuits will be LIVE with
this mode selected.
VOX
(Voice Activated)
ICS toggle switch (orange switch bat) set to the up (VOX) position. Set the ICS VOX Squelch
control fully counter-clockwise and then slowly rotate 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.
3.3.3.1
General ICS Functions
Passenger ICS audio is LIVE when the controller is in the LIVE or KEYED mode of ICS operation. In the
KEYED mode of operation the passenger microphones are LIVE. Utilize drop cord assemblies
incorporating microphone circuit interrupt switches for keyed ICS operation. Passenger ICS is VOX
triggered when VOX mode is selected.
All ICS audio is controlled by the front panel ICS volume control and may be varied to suit conditions. In
multiple station systems, the ICS volume adjusts only the incoming ICS audio level. The ICS VOL control
provides adjustment from approximately 1% to full output.
The mode switch (red switch bat) is used to select between NORMAL and ISO/EMR modes. In the
NORMAL position (down), all operations of the ICS are functional as described above. When the switch
is in the ISO/EMR (pilot isolate/emergency position), the pilot is isolated from the rest of the passengers.
If the controller is operated in the ISO/EMR mode, ICS operation will continue (if there is no fault
condition) between the passengers and copilot, but will exclude the pilot. See section 3.4 for further
details.
The ICS controls consist of the
VOX
and
ICS
controls, which are rotary knobs, and the
ICS
VOX
/
KEY
control, which is an orange two-
position toggle switch. The function of these
controls is outlined below.
