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VOX Threshold Control
When rotated fully counterclockwise (CCW), the threshold will be at minimum (almost live).
To adjust the unit for VOX (Voice activated) use, the VOX control should be set fully CCW and then slowly rotated CW
to the point where no intercom audio can be heard. The VOX control should be adjusted for proper operation
according to the ambient noise.
3.3
Normal Operation Mode
Note: Numbers in parentheses refer to the front panel controls shown in section 3.2.
The J301A-N01 is in Normal mode when the front panel TX select switch (4) is in position COM1 through COM8 or
RMT/ICS and suitable electrical power is supplied to the unit.
3.3.1
Panel Lighting
The legends and annunciators will be illuminated (when appropriate) and dim through the aircraft lighting buss. The
J301A-N01 is NVIS Type I Class B compliant.
3.3.2
Receiving
To listen to audio from a transceiver or receiver, place the appropriate white transceiver and receiver switches (1) in
the up position or rotate the TX Select Switch (4) to point at the desired transceiver position.
To adjust the volume of the receiver and transceiver audio, rotate the front panel RX volume control (8). It will be
muted if the unit is transmitting and muting of receive audio during transmit is enabled.
3.3.3
Transmitting (Transmit Operation)
To transmit on a transceiver, rotate the Transmit Select Switch until it aligns with the line leading to the Transceiver
Select switch legend (see (1)) - default legends COM1 to COM8, or ICS/RMT. The corresponding Transmit Select
annunciator will illuminate.
Then activate the user's TX PTT, and the unit will route the user's microphone audio to the selected transceiver, and
the deadfront Transmit Annunciator (6) will illuminate 'TX'. Sidetone audio will be routed to the user's phones, and
music will be muted for the duration of the transmission.
3.3.4
VOX Operation
The VOX Threshold level is at minimum when the front panel control is fully CCW, and at maximum when fully CW.
The user's MIC audio is routed to the ICS when the MIC audio level exceeds the VOX threshold.
The 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.
Rev A
This is a rotary knob marked VOX that is used to select the VOX
threshold of the unit. See below.
When rotated fully clockwise (CW), the threshold will be at maximum
and VOX ICS operation is disabled and ICS PTT input is required for
ICS operation.
J301A-N01 Audio Controller - NVG
Installation and Operating Manual
Page 18
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