Sea Tel ST144-21, Installation And Operation Manual

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ST144-21 C/Ku-Band TVRO Installation
3-23
•
GND
Screw terminal is the ground reference for the regulated and unregulated power
terminals.
•
12/24
Screw terminal is commonly used to provide operating voltage to a external GPS,
Dual Antenna Arbitrator or other below decks tone generators or switches. Voltage output
is based on the T.M.S assemblies JP5 jumper settings.
3.7.6.6. TS5 NMEA A/B, GPS output.
•
RxA- and RxA+- screw terminals, which are defined as the NMEA A connection is used to
connect to the ships Gyro Compass (Heading). The NMEA0183 compliant inputs are then
connected via a 9 pin ribbon cable to the ACU’s J2 NMEA communications port. A GPS
(Latitude and Longitude) input may also be connected, but is not required because there is
a GPS device already installed in your antenna..
NOTE:
If you connect a ships GPS to the
terminal mounting strip, you
MUST
disconnect the GPS antenna on the antenna
pedestal.
•
RxB- and RxB+ screw terminals, which are defined as the NMEA B connection is used to
connect to the ships Gyro Compass (Heading). The NMEA0183 compliant inputs are then
connected via a 9 pin ribbon cable to the ACU’s J2 NMEA communications port. A GPS
(Latitude and Longitude) input may also be connected, but is not required because there is
a GPS device already installed in your antenna.
•
TxA- screw terminal is used to provide a Pseudo GPS (GGA and GLL formats) output to
other system components such as a Satellite Modem.
3.7.7.
Connect your other Below Decks Equipment (ie, telephone, fax machine and computer equipment) to
complete your configuration.
Other BDE connections
3.8. Final Assembly
3.8.1.
Remove the restraints from the antenna and verify that the antenna moves freely in azimuth, elevation, and
cross level without hitting any flanges on the radome.
Remove Stow Braces/Restraints
3.8.2.
Verify that all pedestal wiring and cabling is properly dressed and clamped in place.
Verify all assembly and Wiring connections
3.8.3.
Assure that the antenna assembly is balanced front to back, top to bottom and side to side by observing that
it remains stationary when positioned in any orientation. Refer to the Maintenance section for complete
information on balancing the antenna.
Balance Antenna Pedestal
3.9. Cable Terminations
3.9.1.
The TX and RX, or TVRO IF, cables must be inserted through the cable strain reliefs at the base of the radome.
Apply RTV to the strain relief joints and tighten the compression fittings to make them watertight. Attach the
pedestal cable adapters to the TX and RX, or TVRO IF, cables from below decks. Refer to the System Block
Diagram.
At The Radome
AC Power cable for the Antenna Pedestal and RF Equipment is routed into the AC Power Breaker box and
connected to the breaker terminals.
Sea Tel recommends that separate, dedicated, AC Power be provided for the Marine Air Conditioner (Do NOT
combine with the AC Power provided for the Antenna Pedestal and RF Equipment). This AC Power cable is
routed into the Marine Air Conditioner and terminated to the AC terminals inside.