MM23016, Rev. C

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5 PRODUCT DESCRIPTION

The M7200 mobile is a state-of-the-art radio that operates seamlessly between the 800 MHz frequency
band and the 700 MHz frequency band. The M7200 is designed to meet the critical communications
demands of public service users and complies with MIL-STD-810F specifications.
The M7200 is capable of supporting multiple operating modes, including OpenSky® digital operation,
EDACS® or ProVoiceTM trunked modes, P25 digital trunked mode, P25 digital conventional mode, and
conventional analog mode.
The M7200 uses Time Division Multiple Access (TDMA) technology in the OpenSky mode to allow
multiple users to share a single RF channel. In addition, a single RF channel can support simultaneous
digital voice and data communications.
The M7200 provides integrated voice and data services. Voice operation is provided using a microphone
and speaker included in the radio installation kit. For data transfers, the M7200 is constructed with an
industry-standard RS-232 interface serial port for connecting an optional laptop PC.
A PC, not included with the M7200, provides network connectivity through the standard serial
(DCE-type) interface.
The M7200 has an integrated Global Positioning System (GPS) receiver. This allows the M7200 to fully
support the Automatic Vehicular Locator (AVL) for fleet management and dispatch applications.
The OpenSky M7200 benefits from a flexible, software-based digital radio design. Features and user
profiles are software-defined and can be reprogrammed over the air. The optional over-the-air
programming feature allows communication protocols to be changed easily and added at any time.

5.1 REMOTE CONTROL HEAD OPERATION

For remote mount installations configured with a CH721 control head, all normal radio operations and
interfaces can be handled via the control head connected to the radio unit by a single twisted-pair
connection routed through a vehicle. Up to six control units may be attached to a trunk mount radio. Each
control head provides a serial access point for data and any one (only one at a time) can be connected to a
data device such as a personal computer.
Where multiple control heads are connected or where a dash-mount radio is installed with additional
remote control heads, the following features are available from each position:
• Outgoing voice calls can be initiated. Any control head can initiate a call but only one can talk at a
time. All other connected control heads will hear both sides of the conversation.
• Incoming and outgoing audio can be heard. Outgoing audio is not broadcast at the source position.
• Independent audio control is available.
• Radio settings such as talk group, scan mode etc., can be controlled. Any connected control head can
override the radio settings of other connected control heads.
• Comfort settings, such as volume and display brightness that are applicable to the individual control
head can be adjusted and cannot be overridden by other control heads.
• An optional intercom function is available between control units. Audio will be broadcast to ALL
connected control heads.