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3. ANTENNA UNIT
Mounting
Install the antenna unit referring to the installation diagram at end of manual. 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 the antenna unit and a stainless steel screw fastened to the mast.
• The antenna unit GPA-018S must be taped. See chapter 7 for instructions.
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
Cable length
30 m
50 m
Necessary parts
CP20-01700
CP20-02700
CP20-01710
CP20-02710
Code no.
004-372-110
004-381-160
004-372-120
004-381-170
OR
Antenna Cable
30 m or 50 m
1 m
Fabricate locally. (See the next page.)
To display unit
Conversion Cable Assy.
TNCP-NJ
For CP20-01700, CP20-01710
For CP20-02700, CP20-02710
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 connector of the antenna cable