7
Installation
2.1 Site Inspection and System Location
Consider the following requirements when planning system installation and choosing a location for
the VNS2500 and other system components:
1. The transmitting antenna should be located as close as possible to the center of the site and
should not be surrounded by large metal objects that may block the RF signal and decrease the
coverage range of the system.
2. The transmitting antenna may be mounted vertically upward or downward, NEVER
horizontally.
3. Magnetic Mount antenna (such as TS638) should be attached to a large metal object (like an air
duct, metal shelf or cabinet) to provide it with a proper grounding.
4. Base Station antenna (such as included with TS654 kit) should be secured to a well-grounded
metal structure or to a pole on the roof. Locate a path for running the coax cable between the antenna
and the transmitter such as a riser (if there is no existing path, create one).
Place the external transmitter in a location that is as close to the roof as possible such as the
penthouse. Keep the distance between the antenna and the transmitter as short as possible to
minimize RF power loss.
2.2 Magnetic Mount Antenna (VS638) Installation
1. Secure the antenna to an adequate grounding surface, HVAC duct or metal “I” beam. The antenna
may be mounted vertically upward or downward, NEVER horizontally.
2. Choose a mounting location that will provide an adequate grounding surface and free space for RF
radiation. If the antenna is mounted too close to metal, a high VSWR may occur which in the long
term may cause damage to the transmitter.
3. The optional wall-mount “L” bracket allows mounting the antenna on the side of a building or other
structure, providing the roof’s overhang is not excessive.
4. If an external transmitter is used, connect the antenna to the ANTENNA terminal at the back of the
external transmitter. Otherwise, connect the antenna to the ANTENNA terminal at the back of the
VNS2500.
2.3 Base Station Outdoor Antenna Kit (VS654) Installation
1. To achieve maximum performance for your outdoor antenna choose a location that is unobstructed
by trees, branches, power-lines, etc. Never mount the antenna where there is a signal-reflecting
surface such as metal, power lines, mirrored glass, etc.
2. Choose a location that is easily accessible in case you need to perform maintenance on the antenna.
3. For optimal performance, make sure the antenna is installed at an elevation that will provide
sufficient clearance to allow your antenna to radiate without interference.
4. It is recommended to mount the antenna where the path of the antenna cable is straight and as
close as possible to the system transmitter. Do not coil up 100 feet of coaxial cable when only 20 feet
of cable is required. Use a RG-8U coax cable that is specified as Low Loss to minimize power loss.
5. The antenna may be mounted vertically upward or downward, NEVER horizontally.
