User Manual

Asset-Link 250 User Manual July 19, 2004
970-00047 Rev. 1.2
CSI Wireless©2004 Specifications subject to change without notice Page 8-5
8 Installing Asset-Link in a Vehicle
Asset-Link is typically, “stealth mounted”. In other words, the antenna and unit
are not obvious nor easily discoverable when installed. Such an installation poses
two challenges: locating the unit so it can be easily accessed for reconfiguring or
removal, and positioning the combo antenna “under the sky” for maximum
satellite coverage.
8.1 Antenna Positioning
The GPS antenna is more sensitive to location than is a cellular antenna. For full
functionality, Asset-Link must consistently receive signals from at least four
satellites (5-6 is considered adequate for the combo antenna). Experience suggests
that a dedicated GPS antenna has 30% greater reception than a stealth-mounted
combo antenna. However, the environment in which the asset is used has a
significant impact on performance.
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The antenna has a clear view of the sky
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The combo antenna is oriented horizontally.
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An imbedded-wire, glass defroster does not cover the
antenna and/or has been tested while the defroster and
antenna are in use. (Non-metal, tinted windshields do
not effect signal reception.)
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The antenna will not be operated within 20 cm of any
person.
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The antenna is not covered by metal of any kind and
thickness. (GPS signals will penetrate metal-free glass,
plastics, fiberglass, and most other non-metal surfaces.)
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The antenna location is not regularly covered with
moisture (GPS attenuation is affected by visible water)
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There is a minimum 4-inch side clearance of the combo
antenna from metal objects.
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The antenna is not located in a high vibration area.
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The antenna will not be compromised by regular
operations of the vehicle
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The antenna has been positioned in different locations
within the asset and the GPS signal-loss noted and
compared.
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Asset-Link has been tested in the service area before a
permanent installation.
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The installation is accessible for maintenance and/or
removal.