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JA94-044 Dual Audio Controller
–
AMS44 Compatible
SECTION 1 - DESCRIPTION
1.1
System Overview
The JA94-044 dual audio controller is a centralized management system for two independent users that distributes
and controls all transceiver, receiver and warning source audio in an aircraft. It enables the selected transmission of
microphone audio to one or more transceivers and distributes all intercom audio. The JA94-044 dual audio controller
can be used in a standalone configuration or a star configuration to prevent the loss of the entire system due to the
failure of one controller. It provides a passive emergency mode that directs the Right User to the COM1 transceiver
and NAV1 receiver, and the Left User to COM2 transceiver and NAV2 receiver.
The JA94-044 is set up on a per-installation basis using a configuration cable and a PC running the product
configuration tool to download system configuration settings via the front panel music / configuration connector. To
facilitate future customizations and certification, neither software nor complex electronic devices are used in the JA94-
044 design.
1.2
Features Overview
The JA94-044 may be configured as a drop-in replacement for the Cobham/NAT AA92, AMS42 & AMS44.
The JA94-044 supports up to 6 transceivers, each selectable from two rotary switches.
The JA94-044 supports up to 4 selectable receivers in two banks of 4 switches.
The JA94-044 provides intercom functions for up to 2 users and up to 6 passengers.
The JA94-044 has individual VOX gating for each user and passenger.
The JA94-044 supports two Direct Audio inputs at a fixed level to two users in Normal and Emergency mode.
The Direct audios may be routed to both Left and Right User phones or Direct Audio 2 routed to Right User and Direct
Audio 1 to Left User.
The JA94-044 supports a third Direct Audio input in Normal mode only.
The JA94-044 allows the receive audios to be disconnected from the Passenger Phones.
The JA94-044 supports two CVR outputs.
The JA94-044 allows transmit access for five crew members (Right User, Left User, Passenger 1, Passenger 2, and
Passenger 6).The JA94-044 allows ICS PTT access for all users and passengers.
The JA94-044 features a Music / Configuration connector on the faceplate for configuration of audio levels and
routing. The port can also be used as a music input and is compatible with most music players.
The JA94-044 has three modes of operation: Normal Mode, Emergency Mode and ICS Isolate Mode.
The JA94-044 supports radio simulcast.
The JA94-044 supports a remote transmit select input.
The JA94-044 supports
selection of Normal Mode and Emergency Mode from a front panel control and selection of
ICS Isolate Mode from an external switch.
