J301A-001 Audio Controller
Installation and Operating Manual
Rev A
Page 19
3.3.5
ICS Operation
ICS audio is the sum of the
user's
MIC audio
when the
ICS KEY
is
active or with MIC audio level exceeding the VOX
Threshold level
, and t
he audio input on the
JAC
ICS TIE
or Andrea Intercom
from other audio controllers.
The ICS audio is output on the
user's
phones.
The ICS audio is muted during transmit.
The ICS audio level at the phones is controlled by the ICS volume control
(9)
.
3.3.6 COM7 PTT Operation
Note
: If the COM7 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 COM7 has been selected for transmit, momentarily
activating the TX PTT will keep COM7 transmitting. A second momentary activation of the TX PTT, or moving the
Transmit Selector away from COM7, will stop the COM7 from transmitting.
3.3.7
Music Operation
To listen to music, place the MUS (music) switch in the up position.
Music to the phones will be muted by incoming audio (ICS, Receive, Direct or Alert Audio) or if the unit is transmitting.
When the incoming audio has ended, the music will gradually return to the previous level.
3.3.8
COM8 Artificial Sidetone Operation
When the Transmit Selector is in the COM8 position and when the USER TX PTT is active, the COM8 Artificial
Sidetone Audio, if enabled, is routed to the USER PHN at the COM8 Artificial Sidetone level.
3.4
Emergency Operation Mode
Emergency mode can be selected by rotating and pulling the TX Select switch on the front panel to the EMER
position, or entered automatically if power to the unit is lost.
3.4.1
Auto Emergency Mode
If the unit is in emergency mode because power has been lost to the unit, the sum of the COM1 transceiver, NAV1
receive, and the four direct audio signals (DIRECT AUDIO 1, DIRECT AUDIO 2, DIRECT AUDIO 3, and DIRECT
AUDIO 4) are routed to the
user's
phones and the CVR. The
user's
microphone and transmit key are connected to the
COM1 transceiver. No other function in the J301A will operate when power is lost. All indicator LEDs, legends and
annunciators will be dark.
3.4.2
Selected Emergency Mode
If the unit is in emergency mode because the TX Select switch is in the EMER position and sufficient power is applied
to the J301A, the sum of the COM1 receive, NAV1 receive and the four direct audio signals (DIRECT AUDIO 1,
DIRECT AUDIO 2, DIRECT AUDIO 3, and DIRECT AUDIO 4) are routed to the
user's
phones and the CVR. The
user's
microphone and transmit key are connected to the COM1 transceiver. The
user
is disconnected from the ICS.
The LEDs, legends and annunciators will retain normal functionality.
