Northern Airborne Technology AA86 - Manual (Page 9)

AA86/87 Stereo Intercom Manual SM48 Rev. 4.00
Page 2-4 Nov 12, 2003
ENG-FORM: 805-0104.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
2.3.4.4 Stereo versus Monaural Headset
The NAT AA86/87’s are full stereo intercom systems. Left and right channels are
provided for Pilot, Co-Pilot, and Passenger headset output positions. Monaural input
sources such as the aircraft radios and the voice/microphone inputs are split and
appear equally in both the Left and Right channel outputs. Therefore, when wiring the
AA86/87 Intercom for monaural operation, headset connection need be made to only
one of the two outputs, either Left or Right channel. DO NOT CONNECT THE TWO
OUTPUTS TOGETHER, simply leave the unused channel output unterminated.
2.3.4.5
Comm Radio Receive Audio
The AA86/87 Intercoms require a ‘headphone’ level radio audio signal. The audio panel
headphone output (or direct navcom audio if no audio panel is installed) must be wired
to Pin 22.
2.3.4.6
Comm Radio Transmit Audio
The AA86/87 Intercoms require connection to the comm radio(s) mic input. Pin 23 must
be wired to the audio panel microphone input (or directly to the comm radio if no audio
panel is installed).
2.3.4.7
Push-To-Talk (PTT)
The pilot’s yoke-mounted or other aircraft Push-To-Talk (PTT) switch should be
connected in parallel to the AA86/87 (at Pin 11) and to the aircraft comm key input (i.e.
audio panel or comm radio PTT input, as appropriate). If the aircraft is equipped with a
second (Co-Pilot) PTT switch, this switch should be connected directly to the AA86/87
at Pin 10.
2.3.4.9
CREW/ALL Switching (AA87 Models Only)
An external SPST switch is required for CREW/ALL selection. Pin 18 must be
grounded (i.e. switch 'closed') to enter the ALL Mode. CREW Mode is selected by
ungrounding Pin 18 (i.e. Switch 'open').
2.3.5 Stereo
Inputs
2.3.5.1 AA87 Models
Separate Stereo inputs are provided for the front (crew) and rear (passenger) seats.
Front seat inputs are Pins 6 and 7 (left and right channels, respectively). Rear seat
inputs are Pins 2 and 3 (left and right channels, respectively).
If a single stereo source is desired to feed the same stereo music to all seats, ‘jumper’
left channel Pins 2 and 6 and right channel Pins 3 and 7 together.