User's Manual

14221-1200-4010, Rev. B
58
10.3 GENERAL INFORMATION ON THE CH-721 CONTROL HEAD
The CH-721 System model control head, shown in Figure 10-4, features a large easy-to-read 3-line
graphical vacuum fluorescent display, an on/off/volume control, menu controls and buttons, trunking
mode buttons, an emergency/home button, a scan on/off button, and three (3) preset buttons. The head
features a 12-key keypad to allow advanced operations without the need of a DTMF-capable microphone.
Other front panel components include a microphone connector and two LED-type indicators. One LED
indicator is the busy indicator that lights when the radio is receiving a call and one is the transmitter-
enabled indicator that lights when the radio is transmitting. All buttons are backlit for viewing in low-
light conditions. Figure 10-5 shows the head’s rear panel.
Figure 10-4: CH-721 System Model Control Head Front Panel
Figure 10-5: CH-721 Control Head Rear Panel
CAN Port
Connectors
(2 places)
Speaker Audio
Connector
Serial Port Connector
(Female DB-9)
DC Power
Connector
Accessory Connector
(Female DB-25)
Note: Serial and Accessory connectors are
shown without waterproof covers.
3-Line Graphical Vacuum
Fluorescent Display
Microphone Connector
On/Off/
Volume
Control
System/-
Group/-
Channel
Selection
Control
/ Ramp Control
Preset/
Softkey
Buttons
Emergency/
Home Button
+/- Ramp Control
Transmit
and Busy
Indicators
Scan On/Off Button
Clear Button
Menu Button
Option Button