Sea Tel ST144-21, Installation And Operation Manual

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Installation ST144-21 C/Ku-Band TVRO
3-22
3.7.4.2. ACU to Terminal Mounting Strip Connections
Connect the TMS to the ACU.
1. Connect the 25 pin ribbon cable from the Terminal Mounting Strip to J1 “Ships Gyro” DB25
on the rear panel of the ACU.
2. Connect the 9 pin ribbon cable (or NMEA serial cable) from the Terminal Mounting Strip to
J2 “NMEA” DB9 on the rear panel of the ACU
3.7.4.3. RXIF Signal Input to the ACU
Connect the RXIF cable from the Base Multiplexer to the J6 “RF IN” connector on the rear of the
ACU. This input provides satellite signal to the tracking receiver inside the Antenna Control Unit.
3.7.4.4. RXIF Input to the Matrix Switch
Connect the RXIF cable from the “RF OUT” on the rear of the ACU to the matrix switch or other
distribution device.
3.7.5.
133BU
If desired, connected the Radio Control Serial Cable from the Base Multiplexer to the COM Port of a
Customer Furnished Computer.
Radio Control Serial Cable
3.7.6.
Connect the Ships Gyro Compass input to the appropriate screw terminals on this strip. The satellite modem
must also be connected to provide compliance with FCC Order 04-286 and WRC-03 Resolution 902.
Terminal Mounting Strip (TMS) Connections
There are several functional connections that may be made on the TMS connectors. Although you may not
need to make all of these connections, they are listed here for clarification during the installation process.
Connect the 9 pin ribbon cable from this PCB to J2 “NMEA” DB9 on the rear panel of the ACU. Connect the
25 pin ribbon cable from this PCB to J1 “Ship Gyro” DB25 on the rear panel of the ACU.
CAUTION - Electrical Shock Potentials exist on the Gyro Compass output
lines. Assure that the Gyro Compass output is turned OFF when handling
and connecting wiring to the Terminal Mounting Strip. DO NOT HOTPLUG
THIS CONNECTION
3.7.6.1. SW1 - Band Selection control output.
This output is used to control below decks tone generator(s), or coax switch(s), for band selection
functions. The band selection control output is driven by the band selected in the MODE –
TRACKING display.
3.7.6.2. SW2 - The Blockage/TX Mute
Control output is driven by Blockage and RF Radiation Hazard functions. This output will short to
ground whenever the antenna is within the programmed AZ LIMIT zone(s) or is Searching, Targeting
or is mispointed 0.5 degrees from satellite peak. This output is commonly used to drive Dual or
Quad Antenna Arbitrator coax switches in dual antenna configurations. The coax switches select
which antenna is feeding signal to the below decks equipment.
3.7.6.3. TS2 Synchro Gyro Compass Input.
Use the R1, R2, S1,S2 and S3 screw terminals to connect the Synchro Gyro Compass to the ACU.
3.7.6.4. TS3 Step-By-Step (SBS) Gyrocompass Input.
Use the COM, A, B and C screw terminals to connect the SBS Gyrocompass to the ACU. Some SBS
Gyro distribution boxes have terminals which are labeled S1, S2 & S3 instead of A, B and C.
3.7.6.5. TS4 Power
•
VREG
Screw terminal is used to provide a regulated DC operating voltage to ancillary
equipment. Voltage out is dependant upon which terminal mounting strip assembly is
provided. 126865-1 supplies 8Vdc @ 1Amp, while the 126865-2 assembly supplies 5Vdc
@ 2Amps.