HARRIS CORPORATION M7200VTAC 사용자 설명서

tactical scenario. However, unlike XCOV, radios connected to using XCOV-TG are limited to 
communicating only on the XCOV-TG talk group and emergency communications. Advanced features 
such as selective calling and mobile data operations are not available to the XCOV-TG connected clients. 
For additional information on the XCOV and XCOV-TG modes, refer to Section 12.1 on page 51 of this 
manual and/or the radio’s operator’s manual (publication number listed in Section 3.3). 

The V-TAC can also function as a local base station at the scene of an incident. Communications of this 
type are supported by a V-TAC operating mode called the Scene-Of-Incident (SOI) mode. Typically, this 
mode is used when the V-TAC and the nearby portable radios are outside of the trunked radio network’s 
normal coverage area. In SOI mode, the V-TAC operates as a local repeater without network 
connectivity. For additional information, refer to the radio’s operator’s manual (publication number listed 
in Section 3.3). 

The M7200 V-TAC is designed to operate in a mobile environment, typically within a motor vehicle. It 
must be connected to an external transmit/receive antenna such as one mounted to the vehicle’s rooftop or 
trunk lid. In high-power mode, the radio’s SMR/NPSPAC channel RF transmit output power is 10 watts 
maximum. However, the power limit for 700 MHz interoperability channel operations is 300 milliwatts 
maximum. This interoperability channel transmit power limit guarantees the 2-watt ERP (effective 
radiated power) limit of the 700 MHz interoperability narrowband channels is not exceeded when the 
radio is connected to a 5 dBd gain antenna. Several different types of external-mount antennas are 
approved and available for use with the radio, as listed in Table 1-1 and Table 4-2.  For additional 
specifications, refer to Section 2 on page 12 of this manual. 

The M7200 V-TAC is designed for remote mounting in a motor vehicle’s trunk, or some other preferably 
unoccupied section in a vehicle, such as a fire truck’s equipment shelf. Typically, only one control head is 
connected to the V-TAC.  However, up to five (5) heads can be connected to it in a multiple control head 
installation. A 3-wire Controller Area Network (CAN) cable provides radio-to-control head(s) 
interconnection. Between the radio and control head(s), the CAN link carries digitized microphone and 
speaker audio, controlling data such as button presses and radio messages, and user data such as that for a 
mobile data terminal connected to serial port of the radio or control head. For proper operation, the CAN 
link must be terminated appropriately on each end. In a multiple control head installation, two or more 
control heads are interconnected to the mobile radio in a series (daisy-chain) fashion via CAN link cables. 

Control heads used with the M7200 V-TAC radio include the CH-721 Scan and the CH-721 System 
model control heads. See Figure 9-1 (page 39) through Figure 9-3 (page 40).  Both heads feature a large 
3-line graphical vacuum-florescent display, front panel controls and buttons for user control of the mobile 
radio, an internal high-power audio amplifier to drive an externally-connected speaker, and a front panel 
microphone connector. The CH-721 System control head also has a 12-button numeric keypad that 
provides Dual-Tone Multi-Frequency (DTMF) keypad functionality and easier operator system/group 
selection control at the control head’s front panel. 

As shown in Figure 9-3 on page 40, the CH-721 Scan and System model control heads have several 
connectors located on the rear panel. These connectors include a DC power connector, two (2) CAN port 
connectors used for CAN link interconnections, an external speaker connector, a 9-pin serial port 
connector for connecting optional equipment such as a mobile data terminal, and a 25-pin multi-function 
connector.