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2. INSTALLATION
2-7
2.2.2 DGPS antenna unit
Choose a mounting location for the DGPS antenna considering the points
mentioned below. DPGS is not necessary for heading determination, however it
can improve the accuracy of GPS position fixing
• Separate the DGPS antenna at least three meters from a radio antenna.
• Do not install the DGPS antenna within the radar beam.
1. Mount the DGPS antenna by one of the methods below.
• Screw it into a one-inch threaded pipe.
• Fasten it to a steel post (φ35-φ90) with stainless steel hose clamps (local
supply).
Ground the antenna to
prevent receiving problems.
CAUTION
Whip Antenna
Spring Washer
Hose
Clamp
Ground Wire (0.3 m)
Post
(
35- 90)
Tap M4 threads in mast.
Fasten ground wire with an
M4 screw.
50
Witt Threads
(W25-14)
Pitch: 1.8143
Qty: 14
Pipe
27.2
Ground to the ship’s body
as shown the right figure.
Note: Screw the pipe into the
preamp BEFORE mounting the pipe.
Mounting with hose clamps
Mounting onto a threaded pipe
Antenna cable
DGPS Antenna (preamp)
GR-800-SC-1-S
Mounting the DGPS antenna
2. Set the spring washer to the whip antenna (local supply) and screw the whip
antenna into the antenna housing. Coat the washer with silicone sealant to
prevent loosening.
3. Drill a tapping hole in the post for an M4 screw and fasten the ground wire
there.