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3.3.3
Transmitting (Transmit Operation)
To select a transceiver, rotate the Transmit Select Switch (5) or (8) until it aligns with the line leading to the
Transceiver Select switch legend (1) (2) or (3) - default legends COM1, COM2, COM3, COM4, COM5 or COM6. The
corresponding Transmit Select annunciator will illuminate green.
When the user's TX PTT is activated, the unit will transmit on the selected transceiver, and the deadfront Transmit
Annunciator will illuminate 'TX'. All MIC and sidetone audio will be routed to the user's phones, and any music (and
RX and/or ICS audio if selected by ProCS™) will be muted for the duration of the transmission.
Passengers 1, 2 and 6 (designated at installation) will transmit on the radio selected by either the Right User or Left
User, as configured by ProCS™.
3.3.3.1
Simulcast Operation
Note: It is important to be aware of the Simulcast configuration of the aircraft.
The ProCS™ configuration program allows the selection of Simulcast Mode. This can be for the left user or the right
user or both, and for each user the simulcast radio selections can be selected separately.
If simulcast has been enabled via ProCS™ and the user's Transmit Selector Switch is set to COM 6 (simulcast
position), the user will transmit on multiple radios as configured by ProCS™.
3.3.3.2
Transmit Timeout Operation
Note: It is important to be aware of the Transmit Timeout configuration of the aircraft.
The ProCS™ configuration program allows the selection of Transmit Timeout. If selected, transmissions will timeout
after 90 seconds.
3.3.3.3
COM5 PTT Operation
Note: If the COM5 transceiver has been configured as duplex, it can be used with a cellphone or
sat-phone. Check your configuration with the installing agency.
If the unit has been configured for cellphone or sat-phone use and COM5 has been selected for transmit, momentarily
activating the TX PTT (either from the faceplate or by some other method) will keep COM5 transmitting. A second
momentary activation of the TX PTT, or moving the Transmit Selector away from COM5, will stop COM5 from
transmitting.
3.3.4
VOX Operation
A user's MIC audio is routed to the ICS when the MIC audio level exceeds the VOX threshold (3).
A user's MIC audio is disconnected from the ICS when the MIC audio level falls below the VOX threshold for 0.5 to 2
seconds.
3.3.5
ICS Operation
ICS audio is the sum of all the MIC audio from users with ICS KEY active or with MIC audio level exceeding the VOX
Threshold level.
The ICS audio also includes the audio input on the ICS TIE from other audio controllers.
The ICS audio is output on the phones of each user.
The ICS audio is muted during transmit as configured by ProCS™.
The ICS audio level at the phones is controlled by the ICS volume control (7) or (10).
Note: If Legacy Passenger ICS Mode has been selected via ProCS™ for compatibility with a previously
installed unit, the passenger microphones are always open when the VOX control is set to PTT and should be
controlled by in-line PTT drop-cords.
Rev A
JA94-044 Dual Audio Controller – AMS44 Compatible
Installation and Operating Manual
Page 20
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