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Microphone connector of the ARD9900:
Pin
Function
1.
Speaker output
2.
BIAS
3.
GND
4.
TX
5.
D/A
6.
PTT
7.
MIC GND
8.
MIC IN
Connection to a PC
A PC interface cable is included with the ARD9900.
Parameter settings can be made by using terminal software such as Windows HyperTerminal.
(Refer to: Control Commands on page 24 for details.)
Connection to a Power Supply
To operate your ARD9900, use a regulated power supply.
The operating voltage must be within the range of 10.7 ~ 16.0 V DC (current
requirement approximately 200mA).
A DC power cable is included with the ARD9900 following the standard convention:
If you have changed the internal jumper for low-voltage battery operation, the
voltage used must be within the range of 5.6 ~ 6.5 VDC.
DO NOT apply 12.0 V with the jumper in this position or severe damage will
result, and the warranty will be void!
Note: There is no low battery voltage detector built into the ARD9900.
Connection to an External Speaker
If you wish to use an external speaker, connect it to the SP OUT jack. This will also disable the
internal speaker.
Level Adjustment
Microphone Level
The microphone level has been properly adjusted at the factory for use with the microphone
provided, therefore no further adjustment is needed for normal operation.
If you wish to use your own microphone rather than the included one, you will need to wire
your microphone connector to match the pins of the ARD9900, and then adjust the microphone
level as described in the following steps:
Description
Monitor output signal is present at this pin when the
internal speaker Jumper is set to 2 – 3.
Power source for an electret condenser type of
microphone. (5V DC through a 2.2K Ohm resistor).
Chassis ground .
Taking this pin to the ground will enable transmit. (The
same as the operation of the TX switch on the front
panel.)
Taking this pin to ground will force the ARD9900 into
the Digital voice communication mode. When this pin is
left open the operation mode will be set by the mode
switch on the front panel.
PTT (push to talk) input.
Microphone ground signal.
Microphone signal input.
RED
Positive ( + )
BLACK
Negative ( - )
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