User Manual

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6802988C54-D
Chapter 2: VML750 Installation
Special Antenna Installation Considerations
WARNING:
To comply with safety regulations, the distance between Antennas and people sitting inside the
vehicle must be more than 8 inches (20 cm).
CAUTION: If your vehicle is equipped with Public Safety Narrow Band (PSNB) equipment, when
installing the Antennas, provide a minimum distance of 78 inches (198 cm) between the PSNB
antenna and any VML750 antenna to ensure coexistence between all systems.
Main Antenna
IMPORTANT: Install the antenna on a flat metal surface with a minimum size of 24 inches (61 cm) x 24
inches (61 cm).
NOTICE: Install the Private network main antenna (when applicable) and the Public network main antenna
on the vehicle roof, preferably in the center front side of it. Ensure that the vehicle roof material is metal. If
not, use a 2 ft x 2 ft metal ground plane and mount the antenna in its center. For best performance, keep a
minimum distance of 36 inches (91.44 cm) between this antenna and any other antenna.
Installing Antenna Cables
Perform this procedure to install antenna cables for public and private network configurations.
Procedure:
1 Connect the Internal cable connector to the WWAN1 WiFi/DIV port on the VML750 LTE Vehicular
Subscriber Modem (VSM) connector panel. Connect the GPS cable connector to the GPS port on the
VML750 connector panel. Form a service loop for the flexible cables coming out of the antenna bottom
near the cable exit to contain any excess cable length. Form these service loops with a minimum bend
radius of 1 inch (2.54 cm). If needed, form a second service loop for the excess length of the jumper
cables near the VML750 with minimum bend radius of 3 inches (7.63 cm). Use plastic cable ties to secure
the cable.
NOTICE: The combo antenna is provided with three flexible coaxial cables coming out of the
antenna bottom side (two threads for internal and GPS are used). Two 12-ft/17-ft coaxial cables are
also provided to connect between the internal and GPS threads and the modem connectors.
2 For the Main and Diversity Antennas, connect the RF cable from the antenna to WWAN2 main and
WWAN2 DIV.
IMPORTANT: Do not use pliers or any other metallic tool for tightening - only Hand-tighten.
Fully tighten the antenna cable connector and verify it is fastened.
3 For the private network configuration, connect the connector of the cable marked External to the WWAN1
Main port on the VML750 connector panel.
IMPORTANT: To protect any unused connectors (WWAN2, LAN/Ethernet, USB) on the back of
the VML750 LTE Vehicular Subscriber Modem (VSM), screw the caps provided in the
installation kit onto these unused ports.