User's Guide

• 6878215A01 APX Mobile Radios and Control Heads Installation Manual
• MN003109A01 APX 8500 Mobile Radio Installation Manual
• MN005720A01 Enhanced Single Band Mobile Radio Installation Manual
The Multiple Control Head (MCH) feature consists of two modes that can be programmed through
Customer Programming Software (CPS):
• All Active mode
• One Active mode
NOTICE: If two or more control heads are connected to the system before enabling the MCH
feature in the CPS, the radio displays Extra CH or CH ID # ERR. Both errors are Fatal.
6.3.1
Setting the ID of the Initial Control Head
When and where to use: This feature allows you to set up the control head in the Front Panel
Programming (FPP) mode. During the setup, the control heads are defined as Control Head Number
1, Control Head Number 2, Control Head Number 3, and Control Head Number 4.
Procedure:
1 Power off the radio by pressing the Power button.
2 Press and hold the left-most Menu Select button and the emergency button simultaneously.
3 While continuing to depress these two buttons, press the Power button to power on the radio
and the control head.
The radio and the control head powers on into FPP mode. The display shows the ID number of
the control head.
4 Turn the MFK to change the ID number of the control head.
The radio displays Please Wait and the ID number of the new control head.
5 When Please Wait is no longer displayed, press the Power button to power off the radio and
exit FPP mode.
6 Repeat step 1 to step 5 to set the ID number for the rest of the attached control heads.
6.3.2
All Active Mode
The All Active mode enables all connected control heads attached to the radio to operate concurrently
with each other. When you activate a feature on one control head, the rest of the control heads have
the same activated features and indicators on their respective display.
NOTICE: The multiple control head feature allows only control heads of the same type to be
connected. Upon power-up, if a control head of a different type is connected to the radio, the
display of all the attached control heads shows the FATAL error CH mismatch.
When you change the volume on one control head, the rest of the active control heads display
the volume bar. All active control heads display the alias/ID number of the control head that
changed the volume.
6.3.3
Activating and Deactivating Intercom in All Active Mode
Prerequisites: This feature only applies to control heads in the All Active mode.
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Chapter 6: Advanced Features
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