Northern Airborne Technology N301A - Manual (Page 4)

N301A-000 Audio Controller
SM45 Installation and Operation Manual
Section 1 Rev: 1.00 Issue 4 Page 1-1
ENG-FORM: 800-0114.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
N301A-000 Audio Controller. All derivative product information shall be contained in the applicable
manual supplement, which may be obtained from NAT as required.
Review all notes, warnings and cautions.
1.2 Product Description
The N301A is an Audio Controller that is compatible with military and civil aviation headsets. The N301A
controls the audio from multiple receivers, and allows transmission of mic audio to a selected transmitter.
Intercom operation is also provided, with two proprietary tie lines for system expansion. Three modes of
ICS are available: HOT; PTT; and VOX.
The N301A is a Dzus mounted audio panel with built in intercom. It provides full headset transmit and
receive functions for the user. The front panel level controls permit user adjustment of selected audio,
such as radio, ICS and VOX squelch.
The user has control of six transceiver positions, six receiver inputs, four direct audio alerts and two
different ICS tie lines.
The N301A is a drop-in replacement for the Andrea A301-6 audio panel.
1.3 Design Features
The N301A system employs NAT's unique audio processing, which reduces noise and tailors the
frequency response to produce clean, crisp intercom audio. Its high output power and low distortion
results in better on-board communication. The unit is designed to meet the requirements of TSO-C50c.
All inputs are fully floating including dedicated alerting inputs, except for the 150
Ω Mic and ICS tie lines.
Independent RX and ICS volume controls are provided, and intercom mode can be varied from HOT MIC
through VOX to PTT (push to talk). In installations configured for the ‘Andrea’ tie lines, the ‘Private’ tie line
can also be used to provide secondary ICS for selected users. The NAT ICS tie line is fully compatible
with other NAT audio systems.
1.4 Specifications
1.4.1 Electrical Specifications
Power Supply:
Operating Voltage
Nominal 27.5 Vdc, with reverse and over voltage protection.
Maximum 30.3 Vdc
Minimum 24.8 Vdc
Emergency 20.0 Vdc