Installation Of Antenna Unit - Raytheon STD 21 GPS Operation Manual

3.2

Installation of Antenna Unit

3.2.1 Comments and recommendations for Antenna Unit location
The sattelite signal received from the satellites by the Antenna Unit is very weak. Small
signal interferences influence the reception quality and the indicated heading information
quality.
Reasons for signal interferences can be:
-- Masks caused by buildings or bridges (mostly in a harbor area), or mountains may
prevent the Antenna Unit from receiving signals.
-- Masks caused by superstructures such as bridges, masts, funnels or cranes
may disturb reception.
-- Signal reflections caused by metallic and/or or wet surfaces influence the signal
receipt by a time--delayed reception.
-- Placement of the Antenna Unit within radar or SATCOM beams may disturb
reception.
-- VHF--antennas may influence GPS signal receipt if the distance between the
VHF--antenna and the Antenna Unit is less than 2 meters (influences caused
by other antennas must be tested).
To prevent all above mentioned influences to satellite signal reception, the best
placement for the Antenna Unit is at the top of the highest mast.
Please note section 3.2.2 before installing the Antenna Unit.
3717/110--850.DOC020002
Satellite Compass
STD 21 GPS
Observe the position of the Antenna Unit (fore and aft label).
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Edition: Feb. 05, 2007