Northern Airborne Technology AA9x - Manual (Page 44)

AA9x Series Single Channel Audio Controller
SM56 Installation and Operation Manual
Section 3 Rev: 1.00 Issue 4 Page 3-1
Section 3 Operation
3.1 Introduction
Information in this section consists of functional and operational procedures for the AA9x Series Single
Channel Audio Controller.
Note: The AA95, AA96 and AA97 series single channel audio controllers are customized units, and may
have unique operational features that are different to the options described, or are not covered in
this manual. Any questions should be directed to the NAT Product Support Department.
3.2 General Information
Figure 1: AA9x Operator Accessible Controls
The AA9x provides control for all aircraft audio, allowing selection of transmit and receive audio, LIVE,
KEYED, or VOX intercom and interface for an additional hand held transmit microphone (hand mic). The
AA95 and AA97 series of audio controllers allow selection of pilot isolation/emergency operation.
Sidetone level is adjustable internally, while receive (RX) and intercom (ICS) levels are adjustable on the
front panel. In most AA9x configurations, all audio (except the sidetone of the radio in use) is muted
during transmit for clarity. In the AA95 and AA97 series of controllers, the directly connected DIRECT
AUDIO 2 input signal (see Section 3.6.1) remains un-muted during transmit. ICS operation will allow
transmit during any ICS mode by using the PTT switch.
3.3 Controls and Indicators
In all AA9x controllers, transmit and PA functions are controlled with a single rotary selector switch, or (in
some configurations) with the TX/PA Select switch. The main receive volume, ICS volume and ICS VOX
squelch are individually adjusted with rotary controls. The ICS operations and receive audios are selected
using color-coded toggle switches. In the AA95 and AA97 controllers, individual receive audio is selected
with color-coded toggle switches. In the AA96 and AA97 controllers, individual receive volumes are
adjusted using rotary controls.
ENG-FORM: 806-0111.DOT
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