19
CONTROLS
The radio features two rotary control knobs and an emergency button mounted
on the top of the radio. Push-To-Talk, option, and monitor buttons are
mounted on the side. The front mounted keypad has six buttons on the P7250
Scan model and 15 buttons on the P7270 System Radio. The P7230 Select
model radio has no front keypad.
Buttons and Knobs
The function of the button and knob controls will vary with mode of
operation. This manual will deal primarily with OpenSky functionality. The
primary functions of the button and knob controls when in the OpenSky mode
of operation are listed in the paragraphs below. Other functions associated
with these controls are detailed in later sections.
POWER ON-OFF
VOLUME KNOB
Applies power to and adjusts the receiver’s 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=31
). The volume range is from a
minimum programmed level of zero (displayed as
OFF
in the
display) up to 31, which is the loudest level.
CONTROL KNOB
Selects systems or groups*/channels (depending on pro-
gramming). This is a 16-position rotary knob.
Note:
A mechanical stop, which can limit the 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. Reinstall the channel knob metal base, tighten the set
screw, and reinstall the channel knob.
EMERGENCY/
HOME BUTTON
Automatically selects a pre-programmed “designated”
Group/System by pressing and holding for a programmed
duration. It can also be used to declare an emergency by
pressing and holding for a programmed duration. The button
must be pre-programmed for either operation, but not both.
PTT BUTTON
Push-To-Talk must be pressed before voice transmission begins.
In trunked mode the radio’s ID is transmitted upon depression of
the PTT button. (Refer to Figure 4.)
OPTION
BUTTON 1
Used to scroll UP through available items within a selected
menu.
OPTION
BUTTON 2
Used to scroll DOWN through available items within a selected
menu.
