Tyco Electronics MM23772 - Manual (Page 25)

MM23772, Rev. B
25
7.2.1 Buttons and Knobs
The function of the button and knob controls will 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.
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. While adjusting the
volume the display will momentarily indicate the volume level (i.e.
VOL=31). 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 when operating within an OpenSky system. This is a 16-
position rotary knob.
A mechanical stop, which can limit the number of positions accessed, is shipped
with the radio but must be installed. To install the mechanical stop, remove the
channel knob, loosen the set screw on the channel knob metal base (using a 1.27mm
hex wrench), and remove the channel knob metal base. Replace the 16 channel ring
with the channel stop ring located at the desired channel. Re-install the channel knob
metal base, tighten the set screw, and re-install the channel knob.
EMERGENCY
BUTTON Press to declare an emergency. Press and hold for three seconds to clear emergency.
PTT BUTTON The Push-To-Talk button ( Figure 7-1 ) 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.).