Sea Tel 2406-7 Operating instructions

Sea Tel, Inc.
4030 Nelson Avenue
Concord, CA 94520
Tel: [phone]
Fax: [phone]
Email: sea[email protected]om
Web: : www.cobham.com\seatel
Sea Tel Europe
Unit 1, Orion Industrial Centre
Wide Lane, Swaythling
Southampton, UK S0 18 2HJ
Tel: [phone]
Fax: [phone]
Email: sea[email protected]om
Web: www.cobham.com\seatel
Sea Tel Inc doing business as Cobham SATCOM
December 16, 2009 Document. No. 126843 Revision D
CAUTION: This stabilized antenna system is designed to be used with transmit/receive equipment manufactured
by others. Refer to the documentation supplied by the manufacturer which will describe potential hazards,
including exposure to RF radiation, associated with the improper use of the transmit/receive equipment. Note that
the transmit/receive equipment will operate independently of the stabilized antenna system. Prior to work on
the stabilized antenna system, the power to the transmit/receive system must be locked out and
tagged.
When the transmit/receive system is in operation, no one should be allowed anywhere within the radiated
beam being emitted from the reflector.
The ultimate responsibility for safety rests with the facility operator and the individuals who work
on the system.
INSTALLATION AND OPERATION
MANUAL FOR SEA TEL BROADBAND-AT-SEA
TRANSMIT / RECEIVE SYSTEM
MODEL: 2406-7

ii
These commodities, technology or software were exported from the United
States in accordance with the Export Administration Regulations. Diversion
contrary to U.S. law is prohibited.
Sea Tel Marine Stabilized Antenna systems are manufactured in the United
States of America.
Sea Tel is an ISO 9001:2000 registered company. Certificate Number 19.2867 was issued
August 12, 2005. Sea Tel was originally registered on November 09, 1998.
The Series 06 Family of Marine Stabilized Antenna Pedestals with DAC-2202 Antenna Control
Unit complies with the requirements of European Norms and European Standards EN 60945
(1997) and prETS 300 339 (1998-03). Sea Tel European Union Declaration of Conformity for
this equipment is contained in this manual.
Copyright Notice
All Rights Reserved. The information contained in this document is proprietary to Sea Tel, Inc.. This document
may not be reproduced or distributed in any form without the consent of Sea Tel, Inc. The information in this
document is subject to change without notice.
Copyright © 2007 Sea Tel, Inc.

iv
Revision History
REV ECO# Date Description By
A N/A December 7, 2007 Production Release. MDN
B N/A May 2, 2008 Updated text & drawings MDN
C N/A January 23, 2009 Change BUC to 8W NJRC. Updated text, & drawings. Updated font &
logo.
MDN
D N/A December 16, 2009 Updated Text, Graphics, and Drawings to reflect current build and GSR2
features
ECM

Table of Contents 2406-7 Broadband At Sea
v
1. INTRODUCTION ..........................................................................................................................................................................................1-1
1.1. GENERAL SYSTEM DESCRIPTION.......................................................................................................................................................................1-1
1.2. PURPOSE..................................................................................................................................................................................................................1-1
1.3. SYSTEM COMPONENTS........................................................................................................................................................................................1-1
1.4. GENERAL SCOPE OF THIS MANUAL....................................................................................................................................................................1-1
1.5. QUICK OVERVIEW OF CONTENTS......................................................................................................................................................................1-1
2. OPERATION.....................................................................................................................................................................................................2-1
2.1. SYSTEM POWER-UP..............................................................................................................................................................................................2-1
2.2. ANTENNA INITIALIZATION ................................................................................................................................................................................2-1
2.3. ANTENNA STABILIZATION .................................................................................................................................................................................2-1
2.4. STABILIZED PEDESTAL ASSEMBLY OPERATION.............................................................................................................................................2-1
2.5. TRACKING OPERATION........................................................................................................................................................................................2-1
2.6. ANTENNA POLARIZATION OPERATION............................................................................................................................................................2-2
2.7. LOW NOISE BLOCK CONVERTER OPERATION.................................................................................................................................................2-2
2.8. RF EQUIPMENT .....................................................................................................................................................................................................2-2
2.9. FCC TX MUTE FUNCTION.................................................................................................................................................................................2-2
2.10. RADOME ASSEMBLY OPERATION......................................................................................................................................................................2-2
3. BASIC SYSTEM INFORMATION........................................................................................................................................................3-1
3.1. SATELLITE BASICS ................................................................................................................................................................................................3-1
3.1.1. Ku-Band Frequency (10.95-12.75GHz) ..............................................................................................................................3-1
3.1.2. Signal level ..........................................................................................................................................................................................3-2
3.1.3. Satellite Footprints ........................................................................................................................................................................3-2
3.1.4. Satellite polarization .....................................................................................................................................................................3-2
3.2. ANTENNA BASICS.................................................................................................................................................................................................3-2
3.2.1. Unlimited Azimuth .........................................................................................................................................................................3-2
3.2.2. Elevation...............................................................................................................................................................................................3-3
3.2.3. Antenna Reflector/Feed Assembly.......................................................................................................................................3-3
3.2.4. Antenna polarization ....................................................................................................................................................................3-3
3.2.5. Fixed frequency, Dual or Tri-band LNBs............................................................................................................................3-3
3.2.6. Stabilization........................................................................................................................................................................................3-3
3.2.7. Search Pattern..................................................................................................................................................................................3-3
3.2.8. Tracking Receiver – Single Channel Per Carrier Receiver.......................................................................................3-3
3.2.9. Tracking ................................................................................................................................................................................................3-4
3.3. COMPONENTS OF THE SYSTEM CONFIGURATION ........................................................................................................................................3-4
3.3.1. Antenna ADE Assembly ..............................................................................................................................................................3-4
3.3.2. Antenna Control Unit ...................................................................................................................................................................3-4
3.3.3. Above Decks AC Power Supply...............................................................................................................................................3-5
3.4. POSITIVE SATELLITE ID ......................................................................................................................................................................................3-5
3.5. OPEN ANTENNA-MODEM INTERFACE PROTOCOL (OPENAMIP™) SPECIFICATION:...........................................................................3-5
3.5.1. Overview:..............................................................................................................................................................................................3-5
3.5.2. Interface requirements:..............................................................................................................................................................3-6
3.5.3. Utilized OpenAMIP Commands: ............................................................................................................................................3-6
4. INSTALLATION.............................................................................................................................................................................................4-1
4.1. UNPACKING AND INSPECTION ..........................................................................................................................................................................4-1
4.2. SITE SELECTION ABOARD SHIP.........................................................................................................................................................................4-1
4.3. ASSEMBLY NOTES AND WARNINGS.................................................................................................................................................................4-1
4.4. INSTALLING THE ABOVE-DECKS EQUIPMENT (ADE) ..................................................................................................................................4-2
4.4.1. 34” Radome Assembly .................................................................................................................................................................4-2

2406-7 Broadband At Sea Table of Contents
vi
4.4.2. Antenna Pedestal Mechanical Checks ...............................................................................................................................4-2
4.5. CABLE INSTALLATION..........................................................................................................................................................................................4-3
4.5.1. Shipboard Cable Installation ...................................................................................................................................................4-3
4.5.2. Cable Terminations In The Radome....................................................................................................................................4-3
4.6. BELOW DECKS EQUIPMENT................................................................................................................................................................................4-4
4.6.1. Antenna Control Unit Connections......................................................................................................................................4-4
4.6.2. Terminal Mounting Strip Connections...............................................................................................................................4-4
4.6.3. Control Cable Connections.......................................................................................................................................................4-4
4.6.4. NMEA GPS, Modem Lock & TX Inhibit Output Cable Connections ..................................................................4-4
4.6.5. Ships Gyro Compass Connections........................................................................................................................................4-4
4.6.6. IF Cable Connections...................................................................................................................................................................4-4
4.6.7. AGC Tracking Input Connections .........................................................................................................................................4-4
4.7. BROADBAND CONNECTIONS BELOW DECKS..................................................................................................................................................4-4
4.8. SET-UP &CONFIGURATION...............................................................................................................................................................................4-4
5. SET-UP & CONFIGURATION................................................................................................................................................................ 5-1
5.1. OPERATOR SETTINGS...........................................................................................................................................................................................5-1
5.2. OPTIMIZING TARGETING (AUTO TRIM).........................................................................................................................................................5-1
5.3. OPTIMIZING TARGETING (MANUALLY)..........................................................................................................................................................5-1
5.4. OPTIMIZING AUTO-POLARIZATION TX/RX ..................................................................................................................................................5-2
5.5. CALIBRATING RELATIVE ANTENNA POSITION (HOME FLAG OFFSET) ....................................................................................................5-2
5.5.1. To Calculate HFO:...........................................................................................................................................................................5-2
5.5.2. To Enter the HFO value:..............................................................................................................................................................5-4
5.6. RADIATION HAZARD AND BLOCKAGE MAPPING (AZ LIMIT PARAMETERS) ........................................................................................5-4
5.7. TX POLARITY SETUP............................................................................................................................................................................................5-5
5.8. TRACK DISP........................................................................................................................................................................................................5-5
5.9. DEFAULT SETUP PARAMETERS ..........................................................................................................................................................................5-6
6. FUNCTIONAL TESTING .......................................................................................................................................................................... 6-1
6.1. ACU /ANTENNA SYSTEM CHECK ....................................................................................................................................................................6-1
6.2. LATITUDE/LONGITUDE AUTO-UPDATE CHECK .............................................................................................................................................6-1
6.3. SHIP HEADING –GYRO COMPASS FOLLOWING CHECK..............................................................................................................................6-1
6.4. AZIMUTH &ELEVATION DRIVE.........................................................................................................................................................................6-1
6.5. FOUR QUADRANT TRACKING TEST..................................................................................................................................................................6-1
6.6. BLOCKAGE SIMULATION TEST...........................................................................................................................................................................6-2
6.7. TEST BROADBAND OPERATION .........................................................................................................................................................................6-2
7. MAINTENANCE AND TROUBLESHOOTING .............................................................................................................................. 7-1
7.1. WARRANTY INFORMATION................................................................................................................................................................................7-1
7.2. RECOMMENDED PREVENTIVE MAINTENANCE...............................................................................................................................................7-1
7.2.1. Check ACU Parameters ...............................................................................................................................................................7-2
7.2.2. Latitude/Longitude Auto-Update check ............................................................................................................................7-2
7.2.3. Heading Following..........................................................................................................................................................................7-2
7.2.4. Azimuth & Elevation Drive.........................................................................................................................................................7-2
7.2.5. Test Tracking .....................................................................................................................................................................................7-2
7.2.6. Visual Inspection -Radome & Pedestal ..........................................................................................................................7-2
7.2.7. Mechanical Checks ........................................................................................................................................................................7-2
7.2.8. Check Balance...................................................................................................................................................................................7-2
7.2.9. Observe Antenna Initialization...............................................................................................................................................7-2
7.3. TROUBLESHOOTING..............................................................................................................................................................................................7-3
7.3.1. Theory Of Stabilization Operation........................................................................................................................................7-3

Table of Contents 2406-7 Broadband At Sea
vii
7.3.2. Series 06 TXRX Antenna Initialization................................................................................................................................7-3
7.3.3. Troubleshooting using DacRemP..........................................................................................................................................7-4
7.3.4. Antenna Loop Error Monitoring.............................................................................................................................................7-5
7.3.5. Reference Sensor Monitoring .................................................................................................................................................7-6
7.3.6. Open Loop Rate Sensor Monitoring ....................................................................................................................................7-7
7.3.7. Open Loop Motor Test.................................................................................................................................................................7-9
7.3.8. To Disable/Enable DishScan.....................................................................................................................................................7-9
7.3.9. Satellite Reference Mode...........................................................................................................................................................7-9
7.3.10. To Read/Decode an ACU Error Code 0008 (Pedestal Function Error): .......................................................7-10
7.3.11. Remote GPS LAT/LON Position:...........................................................................................................................................7-12
7.4. MAINTENANCE...................................................................................................................................................................................................7-13
7.4.1. Balancing the Antenna .............................................................................................................................................................7-13
7.4.2. To Adjust Tilt:..................................................................................................................................................................................7-14
7.4.3. To Reset/Reinitialize the Antenna:.....................................................................................................................................7-15
7.5. PEDESTAL CONTROL UNIT CONFIGURATION –SERIES 06.....................................................................................................................7-16
7.5.1. To configure the PCU; ...............................................................................................................................................................7-16
7.5.2. Model Configuration Numbers............................................................................................................................................7-16
8. 2406-7 TECHNICAL SPECIFICATIONS ........................................................................................................................................8-1
8.1. ANTENNA REFLECTOR/FEED 2406..................................................................................................................................................................8-1
8.2. RF EQUIPMENT .....................................................................................................................................................................................................8-1
8.3. PEDESTAL CONTROL UNIT..................................................................................................................................................................................8-1
8.4. STABILIZED ANTENNA PEDESTAL ASSEMBLY ................................................................................................................................................8-2
8.5. RADOME ASSEMBLY,34” ...................................................................................................................................................................................8-2
8.6. UNLIMITED AZIMUTH MODEM/MULTIPLEXER (3 CHANNEL)...................................................................................................................8-3
8.7. ADE PEDESTAL POWER REQUIREMENTS: .......................................................................................................................................................8-3
8.8. ENVIRONMENTAL CONDITIONS (ABOVE DECKS EQUIPMENT)..................................................................................................................8-4
8.9. BELOW DECKS EQUIPMENT................................................................................................................................................................................8-4
8.9.1. DAC-2202 Antenna Control Unit (ACU) ............................................................................................................................8-4
8.9.2. Terminal Mounting Strip (TMS)..............................................................................................................................................8-4
8.9.3. Satellite Modem...............................................................................................................................................................................8-4
8.9.4. Router ....................................................................................................................................................................................................8-4
8.10. CABLES ....................................................................................................................................................................................................................8-5
8.10.1. Antenna Control Cable (Provided from ACU-Base MUX)........................................................................................8-5
8.10.2. Antenna L-Band IF Coax Cables (Customer Furnished) ..........................................................................................8-5
8.10.3. AC Power Cable Above Decks (Customer Furnished) ...............................................................................................8-5
8.10.4. Gyro Compass Interface Cable (Customer Furnished)............................................................................................8-5
9. DRAWINGS ......................................................................................................................................................................................................9-1
9.1. 2406-7 KU-BAND MODEL SPECIFIC DRAWINGS .......................................................................................................................................9-1
9.2. 2406 GENERAL DRAWINGS ..............................................................................................................................................................................9-1

2406-7 Broadband At Sea Table of Contents
viii
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Introduction 2406-7 Broadband At Sea
1-1
1. Introduction
WARNING: RF Radiation Hazard -This stabilized antenna system is designed to be used with
transmit/receive equipment manufactured by others. Refer to the documentation supplied by the
manufacturer which will describe potential hazards, including exposure to RF radiation, associated with
the improper use of the transmit/receive equipment. Note that the transmit/receive equipment will
operate independently of the stabilized antenna system.
The ultimate responsibility for safety rests with the facility operator and the individuals who
work on the system.
1.1.General System Description
Your system includes a fully stabilized antenna that has been designed and manufactured so as to be inherently
reliable, easy to maintain, and simple to operate. The equipment essentially permits unattended operation except for
start-ups or when changing to different transponders, or satellites.
1.2.Purpose
This shipboard Transmit-Receive (TXRX) system provides you with two-way satellite voice/data broadband
communications while underway on an ocean-going vessel. This can be used to provide a wide variety of telephone,
fax and high speed data applications. Your antenna system can transmit to and receive from any desired Ku-band
satellite which has adequate signal coverage in your current geographic area. This input will be distributed to your
satellite modem and then to all of your other below decks computer, fax and telephone equipment.
1.3.System Components
The 2406 TXRX system consists of two major groups of equipment; an above-decks group and a below-decks group.
Each group is comprised of, but is not limited to, the items listed below. All equipment comprising the Above Decks is
incorporated inside the radome assembly and is integrated into a single operational entity. For inputs, this system
requires only an unobstructed line-of-sight view to the satellite, Gyro Compass input and AC electrical power.
For more information about these components, refer to the Basic System Information section of this manual.
A. Above-Decks Equipment (ADE) Group
1. Stabilized antenna pedestal
2. Antenna Reflector
3. Feed Assembly with LNB(s)
4. Ku-Band Solid State Block Up-Converter (SSPBUC)
5. Radome Assembly
B. Below-Decks Equipment Group
1. Antenna Control Unit
2. Satellite Modem and other below decks equipment required for the desired communications purposes.
3. Other below decks LAN and VOIP equipment
4. Ethernet and telephone cables
1.4.General scope of this manual
This manual describes the Sea Tel Series 06 Antenna (also called the Above Decks Equipment), its’ operation and
installation. Refer to the manual provided with your Antenna Control Unit for its’ installation and operating
instructions.
1.5.Quick Overview of contents
The information in this manual is organized into chapters. Operation, basic system information, installation, setup,
functional testing, maintenance, specifications and drawings relating to this Antenna are all contained in this manual

2406-7 Broadband At Sea Introduction
1-2
THIS PAGE INTENTIONALLY LEFT BLANK

Operation 2406-7 Broadband At Sea
2-1
2. Operation
Operation of your system is accomplished from the DAC-2202 Antenna Control Unit (ACU). Refer to the operation section of
the DAC-2202 Antenna Control Unit manual.
2.1.System Power-up
Turn the power switch on front panel of the Antenna Control Unit (ACU) and the breaker switch inside the Antenna
Radome ON to energize both units.
2.2.Antenna Initialization
A functional operation check can be made on the antenna stabilization system by observing its behavior during the 4
phases of initialization.
Turn the pedestal power supply ON. The PCU will initialize the stabilized portion of the mass to be level with the
horizon and at a prescribed Azimuth and Elevation angles. The antenna will go through the specific sequence of steps
(listed below) to initialize the antenna. These phases initialize the level cage, elevation, cross-level and azimuth to
predetermined starting positions.
Initialization is completed in the following phases, each phase must complete properly for the antenna to operate
properly (post-initialization).
1. Level Cage is driven CCW, issuing extra steps to assure that the cage is all the way to the mechanical stop.
Then the Level cage will be driven exactly 45.0 degrees CW.
2. Elevation axis activates - Input from the LV axis of the tilt sensor is used to drive the Elevation of the
equipment frame to bring the tilt sensor LV axis to level (this results in the dish being at an elevation angle of
45.0 degrees).
3. Cross-Level axis activates - Input from the CL axis of the tilt sensor is used to drive Cross-Level of the
equipment frame to bring the cross-level axis of the tilt sensor to level (this results in the tilt of the Cross-
Level Beam being level).
4. Azimuth axis activates -Antenna drives in azimuth until the “Home Flag” signal is produced. This signal is
produced by a Hall Effect sensor coming into close proximity to a Magnet mounted in the azimuth driven
sprocket.
This completes the phases of initialization. At this time the antenna elevation should 45.0 degrees and Relative
azimuth should be at be at home flag (magnet in the azimuth driven sprocket is at the hall sensor mounted in the PCU
enclosure).
If any of theses steps fail, or the Antenna Control Unit reports model number as "xx03" or “xx06” re-configure the PCU
as described in section the Maintenance section of this manual. If initialization still fails, refer to the troubleshooting
section of this manual.
2.3.Antenna Stabilization
After initialization has completed, real-time stabilization of the antenna is an automatic function of the PCU. Transmit
Muting for FCC compliance requires current ACU & PCU software and proper connections between the Terminal
Mounting Strip and the Satellite Modem. This feature operates automatically, no operator assistance is required.
2.4.Stabilized Pedestal Assembly Operation
Operation of the stabilized antenna Pedestal Control Unit (PCU) is accomplished remotely by the Antenna Control Unit
(ACU). Refer to the Operation section of the Antenna Control Unit manual for more specific operation details. There
are no other operating instructions applicable to the pedestal assembly by itself.
2.5.Tracking Operation
Tracking optimizes the antenna pointing, in very fine step increments, to maximize the level of the satellite signal
being received. The mode of tracking used in this antenna is a variation of Conical Scanning called DishScan. Tracking
is controlled by the ACU. You can toggle Tracking ON/OFF from the ACU.

2406-7 Broadband At Sea Operation
2-2
DishScan continuously drives the antenna in a very small circular pattern at 60 RPM. The ACU evaluates the received
signal throughout each rotation to determine where the strongest signal level is (Up, Right, Down or Left) and then
issues the appropriate Azimuth and/or Elevation steps to move the antenna toward where stronger signal is.
The pedestal cannot control tracking. Refer to the ACU manual for more Tracking information.
2.6.Antenna Polarization Operation
Linear feeds are equipped with a polarization motor and potentiometer feedback and are controlled from the Antenna
Control Unit. Auto-Polarization mode is the default polarization mode of operation from the ACU. Polarization may
be operated manually from the ACU for diagnostic or alignment purposes. Refer to the Antenna Control Unit manual
for more operation information.
2.7.Low Noise Block Converter Operation
There are no operating instructions or controls applicable to the LNBs. The ACU provides DC power to the desired LNB
via the coax rotary joint and the pedestal modem.
A Cross-Pol LNB is installed on the receive port of the feed assembly and its’ output coax is routed to the pedestal
modem (labeled “Cross-Pol”). A diplexer is installed in the TX waveguide between the BUC and the TX port of the feed
assembly. A Co-Pol LNB is installed on the RX output of the diplexer and its’ output coax is routed to the pedestal
modem (labeled “Co-Pol”). The desired output to be sent below decks (Co-Pol or Cross-Pol) is selected by connecting
the correct coax to the pedestal modem.
2.8.RF Equipment
The RF Equipment is not operated or controlled by the antenna pedestal or Antenna Control Unit. Refer to the vendor
supplied manuals for the RF Equipment and Satellite Modem which were provided with your system.
2.9.FCC TX Mute Function
FCC TX Mute function provides a transmit inhibit, or mute, signal to the Satellite Modem to disable transmit whenever
the antenna is blocked, searching, targeting, unwrapping, or is mispointed >0.5 degrees from peak satellite position.
This functionality is provided by software in the ACU & PCU. Hardware wiring connection between the ACU Terminal
Mounting Strip and the Satellite Modem and proper setup of the ACU “SYSTEM TYPE” parameter are also required for
this function to operate properly.
After being properly installed and setup correctly the FCC TX Mute function operation is automatic, therefore, requires
no operator intervention. Refer to the Installation and Setup chapters in this manual and in your Antenna Control Unit
manual.
2.10. Radome Assembly Operation
When operating the system it is necessary that the radome access hatch (and/or side door) be closed and secured in
place at all times. This prevents rain, salt water and wind from entering the radome. Water and excessive
condensation promote rust & corrosion of the antenna pedestal. Wind gusts will disturb the antenna pointing.
There are no other operating instructions applicable to the radome assembly by itself.

Basic System Information 2406-7 Broadband At Sea
3-1
Figure 3-1 Arc of viewable Satellites
3. Basic System Information
This section provides you with some basic information about your antenna system and other equipment within your system
configuration.
3.1.Satellite Basics
The satellites are in orbit at an altitude of
22,753.2 Statute Miles positioned directly above
the equator. Their orbital velocity matches the
Earth’s rotational speed, therefore, each appears
to remain at a fixed position in the sky (as
viewed from your location).
The satellites are simply relay stations that are
able to receive signals from one location on the
globe and re-transmit them to a much larger
area on the globe than a local antenna could do.
Because of their high vantage point, they are
able to cover an area that is larger than a
continent.
Your antenna can be used with any of the Ku-Band (10.95-12.75GHz) satellites in this orbit that have a strong enough
receive signal level in your location. Your antenna is capable of transmitting and receiving Linear signal polarization,
but requires that you have the appropriate LNB installed for the specific frequency range of that satellite.
If you could see the satellites in their positions above the equator, they would appear to form an arc as shown here (as
viewed from a position in the Northern Hemisphere). When you are on the same longitude as the satellite, its’
horizontal and vertical signals will be purely aligned to your horizon. When the satellite is east or west of your
longitude, the satellite signals will appear to be rotated clockwise or counter-clockwise from pure horizontal and
vertical. Both horizontal and vertical signals from a satellite will appear to be rotated the same amount and are always
perpendicular to each other. The amount of rotation is dependent on how far east or west the satellite is from you
and how close you are to the Equator.
3.1.1.
At these frequencies the signal from the satellite travels only in a straight line and is affected by weather
changes in the atmosphere. There are several conditions that can cause a temporary loss of satellite signal,
even within an area where the signal level is known to be adequate. The most common of these normal
temporary losses are blockage and rain fade. They will normally interrupt services only as long as the cause
of the loss persists.
Ku-Band Frequency (10.95-12.75GHz)
Blockage - Blockage is loss due to an object in the path of the signal from the satellite to the dish. If an
object that is large and dense is positioned in the path of the signal from the satellite, it will prevent sufficient
signal from arriving at the dish. The signal can not bend around, or penetrate through, these objects. The
reception will be degraded or completely interrupted until the object is no longer in the path of the signal to
the dish. The dish is actively driven to remain pointed at the satellite (toward the equator) so, as the boat
turns a mast or raised structure on the boat may become positioned between the satellite and the dish.
Blockage may also be caused a person standing near the radome, tall mountains, buildings, bridges, cranes or
other larger ships near your boat. Signal will be lost when the boat is housed inside an enclosure that the
signal cannot penetrate, like a paint shed or a berth with a roof. Moving or rotating the boat to position the
antenna where it has an unobstructed view to the desired satellite will restore the antennas ability to receive
the satellite signal.
Rain Fade -Atmospheric conditions that may cause sufficient loss of signal level include rain, snow, heavy
fog and some solar activities such as sun spots and solar flare activity. The most common of these is referred
to as “rain fade”. Rain drops in the atmosphere reduce the signal from the satellite. The heavier the rain, the
greater the signal loss. When the amount of loss is high enough, the antenna will not be able to stay locked
onto the satellite signal. Once the amount of rain has decreased sufficiently, the antenna will re-acquire the
satellite signal. In strong signal areas, rain fall of about four inches per hour will cause complete loss of signal.
In weaker signal areas, lighter rainfall might cause the signal to be lost.

2406-7 Broadband At Sea Basic System Information
3-2
3.1.2.
The level of the receive signal on a point on the globe is dependant upon how powerful the transmission is
and how wide the signal beam is coverage area is. Focusing the signal into a narrower beam concentrates its
energy over a smaller geographic area, thereby increasing the signal level throughout that area of coverage.
This makes it possible for you to use a smaller antenna size to receive that satellite signal. The antenna
system must be geographically located in an area where the signal level from the satellite meets (or exceeds)
the minimum satellite signal level required for your size of antenna (refer to the Specifications section of this
manual) to provide suitable reception. This limits the number of satellites that can be used and the
geographic areas where the ship can travel where the signal level is expected to be strong enough to continue
providing uninterrupted reception. When traveling outside this minimum signal coverage area, it is normal for
the system to experience an interruption in its ability to provide the desired satellite services until entering (or
re-entering) an area of adequate signal level (refer to the satellite footprint information). Systems with larger
diameter dish antennas can receive signal further out towards the fringe of a given satellites coverage area.
Signal level
3.1.3.
The focused beam(s) from the satellites are normally aimed at the major land masses where there are large
population centers. Footprint charts graphically display the signal level expected to be received in different
geographic locations within the area of coverage. The signal will always be strongest in the center of the
coverage area and weaker out toward the outer edges of the pattern. The coverage areas are intended to be
a guide to reception, however, the actual coverage area and signal level and vary. Also the signal strength is
affected by weather. Your satellite service provider can provide coverage maps specific to your area of
operations for your data/voice applications.
Satellite Footprints
3.1.4.
The satellites you will be using transmit their signals in linear polarization mode (like a flat ribbon down from
the satellite).
Satellite polarization
The feed assembly installed on your antenna is designed to be fitted with a linear LNB (to receive horizontal
and vertical linear polarized satellite transmissions. A motor, which is controlled by the ACU (Auto or Manual
polarization), adjusts the “polarization” angle of the LNB installed on the feed to optimize the alignment of
the LNB to match the angle of the signal from the satellite. Auto-Polarization mode of the ACU normally will
keep the polarization optimized for you. When you are on the same longitude as the satellite, its’ horizontal
and vertical signals will be purely aligned to your horizon. When the satellite is east or west of your longitude,
the satellite signals will appear to be rotated clockwise or counter-clockwise from pure horizontal and vertical.
Both horizontal and vertical signals from a satellite will appear to be rotated the same amount and are always
perpendicular to each other. The amount of rotation is dependent on how far east or west the satellite is
from you and how close you are to the Equator.
3.2.Antenna Basics
The satellite dish is mounted on a three jointed pedestal. As your boat rolls, pitches and turns in the water, these three
joints move to keep the dish pointed at the satellite. The following information is provided to explain some of the
basic functions of the antenna:
3.2.1.
Azimuth rotation of the antenna is unlimited (no mechanical stops). Azimuth drive, provided by the azimuth
motor, is required during stabilization, searching and tracking operations of the antenna. When the ship turns,
azimuth is driven in the opposite direction to remain pointed at the satellite. The actual azimuth pointing
angle to the satellite is determined by your latitude & longitude and the longitude of the satellite. It is
important to know that the antenna should be pointed (generally) toward the equator.
Unlimited Azimuth
The azimuth angle to the satellite would be 180 degrees true (relative to true north) if the satellite is on the
same longitude that you are on. If the satellite is east, or west, of your longitude the azimuth will be less than,
or greater than 180 degrees respectively.
When checking for blockage you can visually look over the antenna radome toward the equator to see if any
objects are in that sighted area. If you are not able to find any satellites it may also be useful to remove the
radome hatch to visually see if the dish is aimed the correct direction (towards the equator).

Basic System Information 2406-7 Broadband At Sea
3-3
3.2.2.
In normal operation the elevation of the antenna will be between 00.0 (horizon) and 90.0 (zenith). The
antenna can physically be rotated in elevation below horizon and beyond zenith to allow for ship motion.
Elevation drive, provided by the elevation motor, is required during stabilization, searching and tracking
operations of the antenna. The actual elevation pointing angle to the satellite is determined by your latitude
& longitude and the longitude of the satellite. In general terms the elevation angle will be low when you are
at a high latitudes and will increase as you get closer to the equator.
Elevation
Additionally, from any given latitude, the elevation will be highest when the satellite is at the same longitude
that you are on. If the satellite is east, or west, of your longitude the elevation angle will be lower.
3.2.3.
Comprised of an aluminum reflector with a Cassegrain feed assembly. The feed assembly is fitted with a
polarization motor and a potentiometer for position feedback required for linear signal operation. A variety
of interchangeable LNB’s may be easily fitted to the feed, allowing it to be fitted with the appropriate
frequency range LNB for the desired Ku-Band satellite.
Antenna Reflector/Feed Assembly
In addition to the real time stabilization of the polarity assembly by the PCU, the ACU automatically adjusts
the polarization angle of the feed by remotely controlling the stepper motor, using the potentiometer
feedback for Linear polarization position (Auto-Polarization mode).
3.2.4.
When you have a linear LNB installed the polarization needs to be periodically adjusted, Auto-Polarization will
automatically accomplish this for you.
Antenna polarization
To adjust polarization UP the LNB (as viewed from the front side of the reflector) must rotate CCW and to
adjust polarity DOWN the LNB must rotate CW.
Polarization adjustment to optimize Auto-Pol is required when initially setting up the system or after you
have installed a different LNB (refer to the Maintenance Section of this manual).
3.2.5.
Your antenna can easily be fitted with a variety of LNBs. The LNB must match the frequency band of the
desired satellite. The Dual-Band LNB is able to be electrically switched from low band to high band from the
antenna control unit. The Tri-Band LNB is able to be electrically switched from low band to mid band to high
band from the antenna control unit. You must also have the correct option file loaded into your satellite
modem for the LNB you have installed, or the band you currently have selected, to be able to use a specific
satellite and its’ voice & data services.
Fixed frequency, Dual or Tri-band LNBs
3.2.6.
This Sea Tel antenna is stabilized in three axes of motion. Stabilization is the process of de-coupling the ships
motion from the antenna. Simply put, this allows the antenna to remain pointed at the satellite while the
boat turns, rolls or pitches under it. To accomplish this, the Pedestal Control Unit (PCU) on the antenna
pedestal senses any motion of the antenna and immediately applies drive to the appropriate motor(s) to
oppose the sensed motion. Azimuth (AZ), Elevation (EL) and Cross-Level (left-right tilt) are actively stabilized
automatically by the PCU as part of its normal operation.
Stabilization
3.2.7.
Whenever the desired satellite signal is lost (such as when the antenna is blocked), the Antenna Control Unit
will automatically initiate a search to re-acquire the desired signal.
Search Pattern
The search is conducted with alternate azimuth and elevation movements. The size and direction of the
movements are increased and reversed every other time resulting in an expanding square pattern.
When the antenna finds the desired satellite signal, the ACU will automatically stop searching and begin
Tracking the signal. Tracking optimizes the pointing of the antenna to get the highest signal level from the
satellite.
3.2.8.
The SCPC Narrow Band Receiver located in the Antenna Control Unit (ACU) is used to acquire, identify and
track a narrow band carrier, or beacon signal, or the desired satellite. When properly setup, the settings for
Tracking Receiver – Single Channel Per Carrier Receiver

2406-7 Broadband At Sea Basic System Information
3-4
the satellite are saved to expedite future acquisition of the desired satellite. The system must have adequate
satellite signal level to stop searching (and begin tracking the acquired satellite).
3.2.9.
The ACU actively optimizes the pointing of the dish for maximum signal reception. This process is called
tracking and is accomplished by continuously making small movements of the dish while monitoring the level
of the received signal. Evaluation of this information is used to continuously make minor pointing corrections
to keep the signal level “peaked” as part of normal operation.
Tracking
3.3.Components of the System Configuration
The following text provides a basic functional overview of the system components and component interconnection as
referred to in the simplified block diagram below. Also, refer to the appropriate page of the System Block Diagram
which depicts your system configuration for further detail.
The System is comprised of two major sections: The Above-Decks Equipment (ADE) is comprised solely of the
antenna radome assembly which is mounted outside, on the boats upper deck or mast location. The Below-Decks
Equipment (BDE) includes the Antenna Control Unit, satellite modem and all other ancillary equipment that is mounted
in various locations throughout the interior of the boat.
3.3.1.
The Above Decks Equipment consists of an Antenna Pedestal inside a Radome assembly. The pedestal
consists of a satellite antenna dish & feed with a linear Low
Noise Block converter (LNB) with polarization motor
mounted on a stabilized antenna pedestal.
Antenna ADE Assembly
The radome provides an environmental enclosure for the
antenna pedestal assembly inside it. This keeps wind, water
condensation and salt-water spray off the antenna pedestal
assembly. This prevents damage and corrosion that would
shorten the expected life span of the equipment.
Low loss coax cables are connected from the antenna
radome assembly to the below decks equipment. The two
cables carry the intermediate frequency (950-2050MHz)
signals from the antenna assembly directly to the below
decks equipment and below decks to antenna. Antenna
control communication between the Antenna Control Unit
and the Pedestal Control Unit are also on one of these coax
cables.
And finally an AC Power cable is also routed to the antenna
to provide the operating voltage to the antenna assembly
3.3.2.
The Antenna Control Unit allows the operator to control and monitor the antenna pedestal with dedicated
function buttons, LED’s and a 2 line display. The ACU and its Terminal Mounting Strip are normally mounted
in a standard 19” equipment rack. The ACU should be mounted in the front of the equipment rack where it is
easily accessible. The Terminal Mounting Strip is normally mounted on the rear of the equipment rack. It is
recommended that the antenna control unit be mounted near the Satellite modem location where you can
see the LED indicators while you are controlling the antenna.
Antenna Control Unit
The Antenna Control Unit is connected to the antenna, ships Gyro Compass and Satellite modem.
Figure 3-3 Antenna Control Unit
Figure 3-2 2406 Above Decks Equipment

Basic System Information 2406-7 Broadband At Sea
3-5
The Antenna Control Unit (ACU) communicates via an RS-422 full duplex data link with the Pedestal Control
Unit (PCU) located on the antenna. This control signal to/from the antenna is on the Coax cable along with
the L-Band Receive IF from the LNB. The Pedestal Control Unit stabilizes the antenna against the ship's roll,
pitch, and turning motions. The ACU is the operator interface to the PCU and provides the user with a choice
of positioning commands to point the antenna, search commands to find the satellite signal and tracking
functions to maintain optimum pointing. The operator may choose to work from either the front panel, using
the M&C Port in conjunction with DacRemP remote diagnostic software, or the built in Ethernet port and a
internal HTML page using a standard internet browser .
3.3.3.
Pedestal Power -An appropriate source of AC Voltage (110 VAC 60 Hz OR 220 VAC 50 Hz) is required for
the above decks equipment. Total power consumption will depend on the number of equipments connected
to this power source.
Above Decks AC Power Supply
RF Equipment (TX/RX Systems ONLY) -The AC voltage source should be well regulated and surge protected.
Uninterrupted Power Supplies are frequently installed (below decks) to provide power for the antenna
pedestal, especially if RF Equipment is installed on the pedestal. Refer to the Specifications section of this
manual for the power consumption of the antenna pedestal and RF Equipment.
Marine Air Conditioner Unit (TX/RX Systems ONLY) -If a marine air conditioner is included with your system,
the AC voltage source should be from a separate AC Power breaker source than the antenna pedestal. AC
power for the air conditioner should be well regulated and surge protected, but does NOT need to from an
Uninterrupted Power Supply. Refer to the marine air conditioner manual for its’ power requirements and
consumption specifications.
3.4.Positive Satellite ID
The ACU has the means of positively identifying a satellite either internally (DVB compliant transponders) or Externally
(Modem lock indication via Ethernet, OpenAMIP, or via an analog DC input into the TMS.
For internal satellite ID, all of the DVB receiver parameter settings must be set to match that of the inbound
transponder.
For external satellite ID, the NID value must be set to 0000 and the system type parameter must include the 2 value
at minimum.
•For OpenAMIP compatible satellite modems, an Ethernet cable connection to the ACU’s Ethernet port is
required. NOTE: The modems option file must be built to enable the appropriate Rx lock indication.
•For non-OpenAMIP compatible satellite modems, 2 wires coming from the Satellite modems must be
connected to the AGC and Ground input pins of the TMS.
3.5.Open Antenna-Modem Interface Protocol (OpenAMIP™) Specification:
3.5.1.
OpenAMIP, an ASCII message based protocol invented and Trademarked by iDirect is a specification for the
interchange of information between an antenna controller and a satellite modem. This protocol allows the
satellite modem to command the ACU (via TCP port 2002) to seek a particular satellite as well as allowing
exchange of information necessary to permit the modem to initiate and maintain communication via the
antenna and the satellite. In general, OpenAMIP is not intended for any purpose except to permit a modem
and the ACU to perform synchronized automatic beam switching. It is
Overview:
NOT a status logging system or a
diagnostic system. In addition, OpenAMIP is intend for a typical installation whereby a specific satellite
modem and Antenna system are properly configured to work together. The protocol does not make specific
provisions for auto-discovery or parameter negotiation. It is still the responsibility of the installer to assure
the parameters of both the satellite modem (proper option files) and the ACU/PCU (setup parameters) are
actually compatible for the intended satellite(s).

2406-7 Broadband At Sea Basic System Information
3-6
3.5.2.
3.5.2.1. Hardware
Interface requirements:
Sea Tel Antenna Control Units Model DAC2202 or DAC2302.
Any Satellite modem manufacturer that is compatible with OpenAMIP
CAT5 Patch cable
3.5.2.2. Software
Sea Tel model DAC2202:
ACU software version 6.06 or greater
CommIF module software version 1.11 or greater
Sea Tel model DAC2302:
ACU software version 7.06b or greater
CommIF module software version 1.11 or greater
3.5.3.
3.5.3.1. Antenna Commands:
Utilized OpenAMIP Commands:
Command Description Example
S f1 f2 f3 Satellite Longitude, 3 parameters:
Degrees E/W (-value equals West), Latitude Variance (Inclined Orbit),
Sat Skew Offset
“S -20.1 1.0 3.5”
P c1 c2 Polarization, 2 parameters:
H,V,L,, or R
“P L R”
H f1 f2 Tracking Frequency: 2 Parameters:
Center Frequency and Bandwidth in MHz
“H 14123.321 0.256”
B f1 f2 Down Conversion Offset: 2 parameters:
LNB (Receive) Local Oscillator and BUC (TX) L.O.
“B 10750”
F Find,
Target satellite using existing S, P,R, and H Parameters
A i Set keep alive in seconds (0 = off) “A 5”
L b1 b2 Modem Lock and free to transmit. 2 parameters:
b1 indicates Rx lock and b2 (not utilized) enables/disables Tx Mute
to BUC
“L 1 1”
W i GPS Update:
Sets GPS Update period in seconds (0 = Off)
“W 300”
I s1 s2 Set modem vendor (s1) and device (s2) 2 parameters: “I iDirect 5100”
3.5.3.2. Modem Commands:
Command Description Example
a i Set keep alive in seconds (0 = off) “a 5”
i s1 s2 Set Antenna Vendor (s1) and device (s2) 2 parameters: “i Sea Tel DAC-2202”
s b1 b2 Antenna Status: 2 parameters:
b1 is functional status and b2 is Tx allowed
“s 1 1”
w b1 f1 f2 t1 Set GPS Position: 4 parameters:
b1 is validity flag, f1 is latitude, f2 is longitude, and t1 is
timestamp
“w 1 38.222 122.123 0”

Installation 2406-7 Broadband At Sea
4-1
4. Installation
Your antenna pedestal comes completely assembled in its radome. This section contains instructions for unpacking, final
assembly and installation of the equipment. It is highly recommended that installation of the system be performed by trained
technicians.
4.1.Unpacking and Inspection
Exercise caution when unpacking the equipment. Carefully inspect the radome surface for evidence of shipping
damage.
4.2.Site Selection Aboard Ship
The radome assembly should be installed at a location aboard ship where:
•The antenna has a clear line-of-sight to as much of the sky (horizon to zenith at all bearings) as is practical.
•The antenna is a minimum of 15 Feet from the ship's Radar, further away if they are high power Radar arrays.
•The antenna is not mounted on the same plane as the ship's Radar, so that it is not directly in the Radar beam
path.
•The antenna is a minimum of 15 Feet from high power short wave transmitting antennas.
•The Above Decks Equipment (ADE) and the Below Decks Equipment (BDE) should be positioned as close to
one another as possible. This is necessary to reduce the losses associated with long cable runs.
•The mounting location is rigid enough that it will not flex, or sway, in ships motion or vibration. If the radome
is to be mounted on a raised pedestal, it MUST have adequate gussets, or be well guyed, to prevent flexing or
swaying in ships motion.
If these conditions cannot be entirely satisfied, the site selection will inevitably be a “best” compromise between the
various considerations.
4.3.Assembly Notes and Warnings
NOTE: Unless otherwise indicated, all nuts and bolts should be assembled
with Loctite 271 or its equivalent.
WARNING: Assure that all nut & bolt assemblies are tightened according the tightening
torque values listed below:
Bolt Size Inch Pounds
1/4-20 75
5/l6-18 132
3/8-16 236
1/2-13 517

2406-7 Broadband At Sea Installation
4-2
4.4.Installing the Above-Decks Equipment (ADE)
4.4.1.
The antenna pedestal is shipped completely assembled in its 34” radome.
34” Radome Assembly
WARNING: Hoisting with other than a webbed four-part sling may result in catastrophic
crushing of the radome. Refer to the specifications and drawings for the fully assembled
weight of your model Antenna/Radome and assure that equipment used to lift/hoist this
system is rated accordingly.
CAUTION: The antenna/radome assembly is very light for its size and is subject to large
swaying motions if hoisted under windy conditions. Always ensure that tag lines, attached
to the radome base frame, are attended while the antenna assembly is being hoisted to its
assigned location aboard ship.
1. Remove the shipping nuts which mount the ADE to its’ pallet.
2. Using a web strap lifting sling arrangement, and with a tag line attached near the radome base, hoist
the antenna assembly to its assigned location aboard ship by means of a suitably sized crane or
derrick.
3. The radome assembly should be positioned with the BOW marker aligned as close as possible to the
centerline of the ship. Any variation from actual alignment can be compensated with the AZIMUTH
TRIM adjustment in the Antenna Control Unit so precise alignment is not required.
4. Bolt the radome base directly to the ship's deck or mounting plate. When completed the radome
base should be as near level as possible.
4.4.2. Antenna Pedestal Mechanical Checks
Web Strap(s) Tie-wrap(s)