NorthStar Navigation GM1708 961XD - Manual (Page 33)

SECTION TWO - Installation
961 INSTALLATION MANUAL Revision A Page 23
body into which the upper half is secured (see Figure 15, “ACU Assem-
bly”). A gasket and rubber O-ring on the upper half provide weathertight
sealing when the two halves are secured. The bottom of the base is
threaded (1"–14) to mount onto an antenna mast or onto a standard deck
mount.
Figure 15: ACU assembly
The ACU connects to the 961X with RG-58U coaxial cable, which carries
signals to the differential receiver and DC power to the ACU amplifier.
See Figure 16 below for the correct AN150/8410 wiring. A 25-foot length
of this cable is supplied with the unit; this cable may be extended up to a
length of 300 feet. The cable passes up through the hollow ACU base and
connects to the PL-259 (UHF) connector at the bottom of the ACU. For
UHF connector preparation, see“Differential GPS antenna cable connec-
tors” beginning on page 25.
CAUTION!
Maintaining the ACU’s weathertight seal between its upper and
lower halves requires only hand-tightening the two together.
Using a wrench or other tool may distort the gasket or housing/
rubber O-ring inside, or break the coupler base.