Spectra Engineering MX800 - Front Panel Features; 1.1.1.2 Local Control Front Panel; Loudspeaker and Volume Control; Microphone Socket

MX800 Transceiver Technical Manual
© SPECTRA ENGINEERING 2006 Revision 4.2.3
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Figure 1-1 Standard Front Panel
1.1.1.2 Local Control Front Panel
The Local Control Front Panel is illustrated in Figure 1-2 below.
Figure 1-2 Local Control Front Panel
It has the same LED indicators as the standard front panel as well as the
following features
Loudspeaker and Volume Control
A 1 Watt loudspeaker is provided to monitor 'on air' received audio as well as
transmit audio from line. Volume control is provided by means of a
potentiometer or a 3-position toggle switch adjacent to the loudspeaker. This
switch is biased in the centre position. To raise or lower the volume the
switch is momentarily moved up or down respectively. For each switch
closure the volume is incremented or decremented a fixed amount. Newer
versions of the MX800 Micro Controller PCB support a conventional rotary
volume control. The newer versions are also backward compatible in that the
Power
RX
TX
CTCSS
Aux
Alarm
RS232 Port
Line I/P Adjust Hole
Push-wheel
Channel Change
Speaker
Volume
Control
RJ45
Microphone
Socket
Squelch
Adjust Hole
Line O/P
Adjust Hole