Northern Airborne Technology AMS43 TSO - Manual (Page 4)

AMS43 TSO Single Channel Audio Controller
SM27 Installation and Operation Manual
Section 1 Rev: 1.00 Issue 4 Page 1-1
ENG-FORM: 800-0116.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
Section 1 Description
1.1 Introduction
Information in this section consists of product description, design features and specifications for the
AMS43 TSO Single Channel Audio Controller. Any derivatives of this product will be identified as
AA95-xxx TSO. All derivative product information will be contained in the applicable manual supplement,
which may be obtained from Northern Airborne Technology Ltd. as required.
Review all notes, warnings and cautions.
1.2 Product Description
The AMS43 TSO provides control for all aircraft audio, allowing selection of transmit and receive audio,
LIVE, KEYED, or VOX intercom, interface for an additional hand-held transmit microphone (hand mic),
and pilot isolation/emergency operation.
Transmit and PA functions are controlled with a single rotary switch. Receive audio, ICS operations and
tape audio are controlled with toggle switches. Receive volume, ICS volume and ICS VOX squelch are
individually adjusted with rotary controls. Sidetone (S/T) level is adjustable internally.
1.3 Design Features
The AMS43 TSO is a Dzus rail mounted unit with lighted faceplate. Transceiver interfacing is
accomplished through directly switched microphones. To ensure maximum radio compatibility, it has a
ground referenced keyline that does not incorporate diodes or other steering components.
Independent control is provided for each audio channel within the controller, allowing sidetone, ICS audio,
and RX audio to be independently set.
Boom mic support is provided for the pilot and co-pilot, with both ICS and XMIT functions via cyclic or
yoke switching. Live (Hot Mic) and VOX ICS are also provided, designed to allow immediate transmission
via this mode without further control panel switching, and immediate return to ICS operation on
completion. The ICS (intercom) function is achieved using dynamic noise reduction and active filtering.
This provides the clearest possible ICS audio under high ambient noise conditions by rejecting airframe
and wind noise, and passing only voiceband information.
All audio, except the S/T of the radio in use and DIRECT AUDIO 2 input signals, is muted during transmit
for clarity. ICS operation allows transmit during any ICS mode by using the transmit PTT switch.
All external interconnects, switches and relay contacts are gold plated for maximum reliability. Switches
and relays are sealed. G10-FR flame-retardant circuit boards are postcoated for maximum moisture
resistance and corrosion prevention. Relays are sealed, high vibration rated (50g shock), dry nitrogen
filled units.