Figure 7-Flared Cable Braid; Figure 8-Completed Bnc Connector; Dgps Antenna Coupler (Acu) - NorthStar 941X Reference Manual

DGPS Antenna
Coupler (ACU)
Page 108
Figure 7—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 han-
dle #227-944 and Cavity B of Die Set 227-980-3.
4) Figure 8 Figure 8: Install cable assembly into body assembly so inner ferrule
Figure 8 Figure 8
slides over dielectric and under braid. Push cable assembly forward
until contact seats in insulator. Slide outer ferrule over braid and up
against connector body. Crimp outer ferrule using Cavity A of tools
specified above.
Figure 8—Completed BNC Connector
If poor GPS SNR readings are obtained after the 941X has been running
for several minutes, check that you have the proper length of cable
matched to the type of antenna (active, passive, or combo), verify the
quality of the antenna location, and the quality of the connectors.
The Northstar 8410 Antenna Coupling Unit (ACU) supplied with the
Differential GPS-equipped 941X must be used in all differential GPS an-
tenna installations, except in cases where the AN190 Combo GPS/DGPS
antenna is used. Though similar in appearance to other Northstar ACUs,
only the one labeled "8410" will work with your internal DGPS beacon
receiver. The ACU also serves as a sturdy mounting base for the DGPS
whip antenna.
The ACU consists of two pieces. The circuitry is sealed in a rugged, wa-
terproof, fiberglass polycarbonate body, the upper end of which is
threaded to accept a standard 4-foot whip antenna. A large female thread
9 — Installation and Interfacing 9 — Installation and Interfacing 9 — Installation and Interfacing 9 — Installation and Interfacing Rev. D