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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
(supplied).
Ground the antenna to
prevent receiving problems.
CAUTION
Whip Antenna*
Spring Washer
Hose
Clamp
Ground Wire (0.3 m)
Post
(
φ
35-
φ
90)
Tap M4 threads in mast.
Fasten ground wire with
an M4 screw.
50
Witt Threads
(W25-14)
Pitch: 1.8143
Qty: 14
Pipe
φ
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
*: The whip antenna should
be taped. See section 2.9
for instructions.
Mounting the DGPS antenna
2. Set the spring washer to the whip antenna and screw the whip antenna into
the antenna housing. Coat the washer with silicone sealant to prevent
loosening.
3. Tap M4 threads on the post and fasten the ground wire with an M4 screw.