Mode Knob; Led Indicator - Motorola APX 4000 Manual

MODE KNOB

MODE KNOB
The sixteen-position knob on top of the APX portable radio is
called the mode knob or "selector." It primarily functions to
change back-and-forth between talk-groups within a
particular zone.
The white line running down the side of the mode knob tells
you what particular number the knob is currently set to; the
knob will click as you rotate it.
Immediately underneath of the mode knob is the encryption
on/off switch (see inset). This switch is not programmed in
the FC/CoMIRS radios as this is done in the Zone and talk-
group selection in those radios that are programmed with
encryption capabilities.

LED INDICATOR:

Next to the mode knob is a small LED indicator. This LED has three colors: red,
green, and yellow. The LED indicator is
COLOR
Solid Red
Blinking Red
Blinking Yellow
Solid Green
Blinking Green
typically not illuminated.
MEANING
Radio is transmitting
Burst transmission/data or low battery
(constant)
Radio is receiving an encrypted transmission
Radio is powering up
Radio is receiving a private call or page