Northern Airborne Technology PIA01-001 - Manual (Page 13)

PIA01-001 Passenger Intercom Amplifier
SM78 Installation and Operation Manual
Section 2 Rev: 1.00 Issue 1 Page 2-4
ENG-FORM: 805-0121.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
2.4.4.1.2 VOX Level Input (VOX INC / VOX DEC)
The PIA01 has two VOX Level Inputs for adjusting the VOX threshold for all users. Each activation of the
VOX switch causes one VOX level change of 2 dB. On power-up the VOX level defaults to approximately
10 dB above the minimum setting. The maximum setting is for keyed ICS operation; the users ICS Key
switch must be activated to talk on the intercom.
These inputs are only active when the PIA01 is operating in analog mode. In digital mode the PIA01 VOX
level is controlled by data on the Digital ICS Tieline.
2.4.4.1.3 Headphone Impedance Input (PHN IMPEDANCE)
The PIA01 has one Headphone Impedance Input for selecting the headphone impedance setting for all
users. Three settings are available, alternate impedance with the input grounded, standard impedance
with the input open circuit, and low impedance with the input connected to 28V dc. For TSO approval this
input must be open circuit.
This input is only active when the PIA01 is operating in analog mode. In digital mode the PIA01
Headphone Impedance setting is controlled by data on the Digital ICS Tieline.
2.4.4.1.4 Microphone Impedance Input (MIC IMPEDANCE)
The PIA01 has one Microphone Impedance Input for selecting the microphone impedance setting for all
users. Three settings are available, standard impedance with the input grounded, alternate impedance
with the input open circuit, and low impedance with the input connected to 28Vdc. For TSO approval this
input must be connected to ground.
This input is only active when the PIA01 is operating in analog mode. In digital mode the PIA01
Microphone Impedance setting is controlled by data on the Digital ICS Tieline.
2.4.4.1.5 ICS Tieline Load Input (NAT ICS LEVEL)
The PIA01 has one ICS Tieline Load Input for selecting the number of ICS Tieline loads on the Analog
ICS Tieline. Two settings are available, two loads and four loads.
This input is only active when the PIA01 is operating in analog mode. In digital mode the PIA01 the
Analog ICS Tieline does not operate.
2.4.4.1.6 Music Level Input (MUSIC LEVEL)
The PIA01 has one Music Level Input for selecting the level setting for the Music Input. Two settings are
available, low level with the input grounded, and high level with the input open circuit.
This input is only active when the PIA01 is operating in analog mode. In digital mode the PIA01 Music
Input Level is controlled by data on the Digital ICS Tieline.