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2. Digital Voice Communication mode (non encryption or fixed scramble code
mode)
Set the mode switch to [~] (analog mode). Press and hold this switch to
force the ARD9900 to decode digital voice signals.
Caution: Frequency tolerance for both parties must be in the range of +/-125 Hz.
(Refer to: Operations -- Digital Voice Communication force receive at page 17
for details.)
c.
BUS LED (Busy LED)
Steady red
The unit is in the transmit mode
Flashing red
Flashes red while the header information is being sent, when in the digital
communication mode. (Approximately one second).
Green
The unit is in the receive mode
Not lit
The unit is in the standby receive mode or in the analog voice receive
mode.
d.
STA LED (Status LED)
In the data communication mode, lit while unsent data is in the memory. It
displays orange when the Video Through Function is activated (Digital
Image Communication mode). When the Video Through Function is de-
activated (AVT command is OFF), this LED will not be lit.
e.
Speaker volume adjustment
Adjustment for the internal speaker output level (or the external speaker
output level when it is connected.)
f.
MODE LED (Operation Mode LED)
Indicates the current operation mode:
Lit in green
Lit in red
Lit in orange
Not lit
g.
CHANNEL switch
Select preloaded encryption code.
(Refer to: Channel Switch Setting at page 15 for details.)
h.
Overload indicator
Lit when the microphone input is overloaded (too high).
A proper microphone input level will cause the LED to flash from time to
time when speaking into the microphone at a normal level.
The microphone level can be adjusted with the microphone level controller.
(Refer to: Level Adjustment at page 13 for details.)
----- Digital Voice mode
----- Analog Voice mode
----- Data Communication mode
----- Digital Image Communication mode
6
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