NorthStar 951X Installation Manual page 28

SECTION TWO - Installing the unit
Page 18
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Wiring the AN150 antenna
Supplied with the antenna is a 50-foot length of RG-59 coaxial cable to
use with the GPS-only AN150 "active" antenna (as well as the GPS/DGPS
AN205-P "combo" antenna).
The GPS-only antenna must be used with a minimum of 20
feet of cable, and no more than 100 feet. Any unused length
must be coiled up; do not cut it to less than 20 feet!
Mounting the AN150 antenna
Tools needed:
• flat-bladed screwdriver
•
knife blade
•
Amphenol crimp tools
One TNC connector is pre-attached to the antenna-end of the RG-59
coaxial cable. Connection to the antenna itself involves the following
steps:
1. Remove the antenna base by loosening the four captive screws in the
base.
2. Screw the base onto the top of the antenna mount (standard 1"-14
marine thread).
3. Feed the open end of the supplied coax cable down through the
antenna base and through the hollow core of the antenna mount.
4. Affix the TNC connector-end of the coax to the mating connector
inside the upper half of the GPS antenna. Be sure to tighten it
securely, as vibration can loosen the connection over time. In addi-
tion, protect the coax-to-antenna connection with liquid electrical
tape or self-vulcanizing electrical tape.
5. Align the upper half of the antenna with the bottom half and tighten
the four screws. Be careful not to over-tighten the screws, as this may
deform the watertight seal between the two antenna halves.
6. Make a termination for a male BNC connection—as described in the
following steps—then connect the antenna to the female BNC con-
nection at the back of the unit.
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CAUTION!
1. Strip cable jacket to the following dimensions (in
inches), as illustrated in Figure 8: "Stripping the coax
cable jacket," below: a=0.57, b=0.34, c=0.14, d=0.43. Do
not nick the center conductor.
951/952 INSTALLATION MANUAL Revision B