GreenHalse Electronics RComLow, Installation Manual & User Manual

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RCom Installation Guide & User Instructions
match the signal levels from all the headsets on the system.
4. Mic Bias:
There are two basic microphone types that can be used with
the RCom - dynamic and electret (or condenser). electret mics have a built
in pre-amp and require a small DC voltage to be present on the mic socket.
This setting can be used to switch on the required 2V bias voltage for such
microphones.
Level control
The LEVEL control is not a normal volume control, but it simply an
input into a small computer. Normally, the control signal is simply fed
directly to a digital pot that controls the actual analogue signals. The effect
is that normally the LEVEL control appears to be a normal volume
control.
However, when the CALL button is held in and the MIC ON button
pressed, the unit enters set-up mode, and the LEVEL control takes on
another function. Pressing the MIC ON button again causes the LEVEL
control to take on the next function, and so on.
When entering a set-up mode, to avoid sudden and undesired changes to
the setting, the LEVEL control may initially have no effect. The control
must be rotated to the current setting before any change takes place,
effectively synchronising the control with the current setting.
Indicators
The CALL and MIC ON indicators also take on different functions in
set-up mode.
The blue CALL light flashes one long flash when the mode is changed,
then a repeated 1, 2, 3 or 4 short flashes to indicate which function is being
adjusted.
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