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MM-008212-001, Rev. A
25
The functions of the button and knob controls vary depending on the mode of operation. The primary
functions of the button and knob controls when in the OpenSky mode of operation are listed in the
following paragraphs. The functions while in other modes are discussed in later sections.
POWER ON-OFF/VOLUME
KNOB
Applies power to the radio and adjusts audio volume.
Rotating the control clockwise applies power to the radio. A single
alert tone (if enabled through programming) indicates the radio is
operational.
Rotating the control clockwise increases the volume level.
Minimum volume levels may be programmed into the radio to
prevent missed calls due to a low volume setting. While adjusting
the volume the display will momentarily indicate the volume level
(i.e. VOL=40). The volume range is from a minimum programmed
level of zero (displayed as MUTE in the display) up to 40, which is
the loudest level.
VOICE GROUP SELECTION
KNOB
Used to select voice groups/channels. This is a 16-position rotary
knob.
Note: A mechanical stop, used to limit the number of accessible
positions, is shipped with the radio but must be installed. To install
the mechanical stop, remove the voice group selection knob,
loosen the set screw on the voice group selection knob metal base
(using a 1.27mm hex wrench), and remove the voice group
selection knob metal base. Replace the 16 channel ring with the
channel stop ring located at the desired channel. Re-install the
voice group selection knob metal base, tighten the set screw, and
re-install the voice group selection knob.
EMERGENCY BUTTON
Used to declare an emergency by pressing and holding for a
programmed duration.
PTT BUTTON
The Push-To-Talk button must be pressed before voice
transmission begins.
SIDE OPTION BUTTON 1
SIDE OPTION BUTTON 2
Scrolls UP or DOWN thru available items within a sub-menu
(available talk groups, pre-programmed speed dial numbers,
canned alert messages, etc.).