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Technical Manual
1.1.1 Front Panel
1.1.1.1
Standard Front Panel
The SMX920 front panel comes in both horizontal and vertical types, this can be see
in the illustrated below. The front panel provides the user with real time status of the
SMX920.
Figure 1-1 SMX920 Horizontal andVvertical types of Front Panel LEDs
♦
Microphone /Accessory Socket
An RJ45 socket is provided on the front panel for connection of a
microphone. This socket is wired for compatibly with other industry
standard microphones. The desk top microphone is compatible with the
SMX920 and MX800. Also provides RS 232 Communication between
radio and PC. The pin configuration can be found in Appendices Section
8.1
♦
RS232 Port
The RS232 programming port is part of the front Panel Microphone
accessory socket. You will be required to make a RS232 cable to be able to
communicate will the in built menu system software in the SMX920.
Please refer to Appendices Section 8.3 on how to make this cable.
♦
Loudspeaker and Volume Control
A 3 Watt loudspeaker is provided to monitor 'on air' received audio. The
volume is adjusted in the usual manner by Rotating the volume control
clockwise to adjust the volume control for a comfortable listening level. If
no sound is heard, temporarily un-mute the radio by briefly rotating the
Squelch Control full anti-clockwise. You can adjust the volume by
listening to the receiver's background noise.
The speaker can also monitor a tone output function from the
microcontroller. This may be used in conjunction with the appropriate
software configuration to generate an alert tone to the user.
♦
Mute / Squelch Adjustment
The squelch is used to eliminate any annoying background noise when
there are no signals present. When no signal is received, rotate the Squelch
control (SQL) fully counter clockwise first, and then rotate SQL clockwise
to the point that the noise just disappears. This will provide optimum
Squelch performance.
When the Squelch is Open, the receiver's background noise can be heard
and 'Green RX LED' is lit on the front panel display. When the Squelch is
closed, the receiver remains quiet when there are no signals present but any
RELM/
BK RADIO
Installation and Operation
3
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