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C-3
3. ANTENNA UNIT
Mounting
Install the antenna unit referring to the installation diagram on page D-4.
When selecting a mounting location for the antenna unit, keep in mind the
following points.
• Select a location out of the radar beam. The radar beam will obstruct or
prevent reception of the GPS satellite signal.
• Be sure the location offers a clean line-of-sight to satellite. Objects
within line-of-sight to a satellite, for example, a mast or funnel, block
reception and cause prolonged acquiring time or interruption of position fix.
• Mount the unit as high as possible. Mounting the antenna as high as
possible keeps it free of water spray, which can intercept reception of GPS
satellite signal, if water spray is frozen.
• The antenna unit GPA-018S must be grounded. Connect ground wire of
1.25 sq or larger (local supply) between unit and a stainless steel screw
fastened to the mast.
Extending Antenna Cable Length
The standard cable is 15m long. 30m and 50m long extension cable sets
are optionally available.
!Extension cable line-up
Fabricate the end of antenna cable and attach the coaxial connector.
Details are shown on next page.
1 m
Antenna Cable
30 m or 50 m 1 m
Fabricate locally. (See the next page.)
To display unit
: Connector
Conversion
Cable Assy.
Antenna Unit
GPA-018S GPA-017S
20cm
GPA-019S
Extension Cable Line-up
!Waterproofing the connector
Wrap connector with vulcanizing tape and then vinyl tape. Bind the tape
end with cable-tie.
How to waterproof the antenna