NorthStar Navigation GM1708 961XD - Manual (Page 28)

SECTION TWO - Installation
Page 18 961 INSTALLATION MANUAL Revision A
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.
1. Strip cable jacket to the following dimensions (in
inches), as illustrated in Figure 7: ‘Stripping the coax
cable jacket,’ below: a=0.57, b=0.34, c=0.14, d=0.43. Do
not nick the center conductor.
Figure 7: Stripping the coax cable jacket
2. See Figure 8: ‘Flared cable braid,’ below: Slide outer
ferrule on as shown. Slightly flare the end of cable
braid, as shown, to facilitate insertion into inner fer-
rule.
Figure 8: Flared cable braid
3. Place center contact onto center conductor so that it
butts against the cable dielectric. Crimp the contact in
place using Amphenol tool handle #227-944 and Cav-
ity B of Die Set 227-980-3.
4. Install cable assembly into body assembly so inner fer-
rule slides over dielectric and under braid. Push cable