NavCom SF-2040 Rev.E - Manual (Page 28)

SF-2040 User Guide - Rev. E
GPS Sensor
The all in one construction of the GPS sensor allows it
to be mounted on a surveyor’s pole or any apparatus
via the female 5/8” thread mounting receptacle on the
bottom of the housing. (See Figure 2) The sensor
should be stored in its ruggedized storage case. It
should not be placed in a space where it may be
exposed to excessive heat, moisture, or humidity.
There should be an unobstructed view of the sky above
a 10-degree
elevation mask for optimum GPS satellite
visibility. Any obstructions above the horizon should be
mapped using a compass and clinometer and used in
satellite prediction software with a recent satellite
almanac to assess the impact on satellite visibility at that
location. Potential sources of interference should be
avoided where possible. Example interference sources
include overhead power lines, radio transmitters and
nearby electrical equipment.
To take full advantage of the StarFire
™ service, there
needs to be a clear line of sight between the antenna
and the local Inmarsat satellite. Inmarsat satellites are
geo-synchronized 35,768kms above the Equator
currently at Longitudes 098°West, 025°East, and
109°East.
‡
There are no user serviceable parts inside the SF-2040
GPS sensor. Opening the unit will compromise the
environmental seal and will void the equipment
warranty.
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