Furuno GR-80 - Manual (Page 9)

5
INSTALLATION
Antenna Installation
Siting considerations
• Install the antenna vertically and as high
and far away from surrounding obstacles
as possible.
• Separate the antenna at least three meters
from any transmitter antennas which are
radiating at significant RF power levels.
Mounting the antenna coupler
It can be mounted two ways:
• The threaded antenna base accepts a stan-
dard antenna mount with a 1"-14 straight
thread. Mount the antenna on a length of
pipe with a 1"-14 threaded end. DO NOT
USE TOOLS TO FASTEN THE AN-
TENNA TO ITS MOUNTING; ONLY
HAND TIGHTEN. Route the antenna
cable (antenna extension cable) inside the
pipe.
• Attach the antenna coupler to a steel mast
with hose clamps (option).
Hose
clamps
Whip
antenna
Steel mast
Ground
terminal
Spring
washer
Figure 2 Attachment of antenna coupler
to steel mast
Mounting of whip antenna
Screw in the whip antenna in the hole at the
top of the preamp unit. Coat junction with
silicone rubber.
Ground
If the preamp unit is attached to a steel mast,
run a ground wire between the ground ter-
minal on the preamp unit and a stainless steel
bolt welded to the mast. The ground wire
should be as short as possible. (It is also rec-
ommended to ground the preamp unit when
it is attached to a non-metallic mast.)
Ground the equipment to
prevent loss of sensitivity.
CAUTION
Connection of antenna cable
The antenna cable (15 m) is attached to the
preamp unit. When optional 30 m or 60 m
cable is used, tape the junction with self-
vulcanizing tape and vinyl tape to water-
proof the cable. Finally, attach cable tie near
ends of tape to prevent unwinding.
Figure 3 How to tape the antenna cable
Connection of RG-10UY cable
Use the Antenna Cable Set (option) to con-
nect the RG-10UY cable.
GR-80
*Cable Assy.
RG-10UY
*: Antenna Cable Set parts
*N-P-7
*TNC-SA-JJ
*Cable Assy.
*
*: The whip antenna should
be taped.
See page 25 for instructions.