Sea Tel DTV04 User manual

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
April 23, 2009 Document. No. 130099 Revision A
INSTALLATION AND OPERATION MANUAL
FOR SEA TEL MODEL
DTV04 HD 5LNB TVRO ANTENNA
WARNING: Antenna Pedestal must be properly restrained (stowed) to
prevent damage to wire rope isolators, isolator springs and/or antenna pedestal
mechanism during underway conditions when power is removed from the
antenna assembly.

ii
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 04 Family of Marine Stabilized Antenna Pedestals with DAC-2200 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 © 2009 Sea Tel, Inc is doing business as Cobham SATCOM.

iv
Revision History
REV ECO# Date Description By
A N/A April 23, 2009 Initial Release ECM

DTV04 HD TVRO Antenna Table of Contents
v
1. INTRODUCTION...........................................................................................................................................................................1-1
1.1. GENERAL DESCRIPTION OF SYSTEM.......................................................................................................................................1-1
1.2. GENERAL SCOPE OF THIS MANUAL.........................................................................................................................................1-2
1.3. QUICK OVERVIEW OF CONTENTS...........................................................................................................................................1-2
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. ANTENNA PEDESTAL OPERATION ..........................................................................................................................................2-1
2.5. TRACKING OPERATION.............................................................................................................................................................2-2
2.6. REFLECTOR SKEW OPERATION................................................................................................................................................2-2
2.7. LOW NOISE BLOCK CONVERTER OPERATION ......................................................................................................................2-2
2.8. RADOME ASSEMBLY OPERATION ...........................................................................................................................................2-2
3. BASIC SYSTEM INFORMATION ....................................................................................................................................... 3-1
3.1. SATELLITE BASICS .....................................................................................................................................................................3-1
3.1.1. Ku-Band Frequency...............................................................................................................................................3-1
3.1.2. Ka-Band Frequency ...............................................................................................................................................3-1
3.1.3. Signal level..................................................................................................................................................................3-3
3.1.4. Satellite polarization.............................................................................................................................................3-3
3.2. ANTENNA BASICS......................................................................................................................................................................3-3
3.2.1. Azimuth........................................................................................................................................................................3-3
3.2.2. Elevation......................................................................................................................................................................3-3
3.2.3. Antenna Reflector/Feed Assembly................................................................................................................3-4
3.2.4. Stabilization...............................................................................................................................................................3-4
3.2.5. Search Pattern .........................................................................................................................................................3-4
3.2.6. Tracking Receiver - Satellite Identification Receiver...........................................................................3-4
3.2.7. Tracking.......................................................................................................................................................................3-5
3.2.8. Unwrap.........................................................................................................................................................................3-5
3.3. COMPONENTS OF THE SYSTEM CONFIGURATION..............................................................................................................3-6
3.3.1. Antenna ADE Assembly ......................................................................................................................................3-7
3.3.2. Antenna Control Unit ...........................................................................................................................................3-7
3.3.3. Power Supply ............................................................................................................................................................3-8
3.3.4. Satellite Receivers ..................................................................................................................................................3-8
3.3.5. Television/Monitor.................................................................................................................................................3-8
3.3.6. Matrix Switch............................................................................................................................................................3-8
4. INSTALLATION .............................................................................................................................................................................4-1
4.1. GENERAL CAUTIONS &WARNINGS.......................................................................................................................................4-1
4.2. SITE SURVEY ...............................................................................................................................................................................4-1
4.3. PREPARING FOR THE INSTALLATION.....................................................................................................................................4-2
4.3.1. Unpack Shipping Crates......................................................................................................................................4-2
4.3.2. Installing The Cables............................................................................................................................................4-2
4.4. PREPARING THE ADE FOR LIFT...............................................................................................................................................4-2
4.5. ANTENNA PEDESTAL MECHANICAL CHECKS.......................................................................................................................4-3
4.6. CABLE TERMINATIONS .............................................................................................................................................................4-3
4.6.1. At The Radome ........................................................................................................................................................4-3
4.7. FINAL CHECKS ............................................................................................................................................................................4-3

Table of Contents DTV04 HD TVRO Antenna
vi
4.8. POWER-UP –OBSERVE THE ANTENNA................................................................................................................................. 4-3
4.9. SETUP...........................................................................................................................................................................................4-3
5. SETUP....................................................................................................................................................................................................5-1
5.1. INITIAL SETUP............................................................................................................................................................................5-1
5.2. DEFAULT SETUP PARAMETERS –DTV04 HD ANTENNA SYSTEM ................................................................................ 5-1
5.3. OPTIMIZE TARGETING .............................................................................................................................................................5-2
5.4. REFLECTOR SKEW ......................................................................................................................................................................5-5
5.5. BLOCKAGE MAPPING ................................................................................................................................................................5-5
5.5.1. Pointing Angles Reference Chart................................................................................................................... 5-6
6. FUNCTIONAL TESTING...........................................................................................................................................................6-1
6.1. (OPTIONAL) TSC-10 TOUCH SCREEN CONTROLLER CHECKS ...................................................................................6-1
6.2. ACU /ANTENNA SYSTEM CHECK .........................................................................................................................................6-1
6.3. LATITUDE/LONGITUDE AUTO-UPDATE CHECK ..................................................................................................................6-1
6.4. AZIMUTH &ELEVATION DRIVE..............................................................................................................................................6-1
6.5. FOUR QUADRANT TRACKING TEST .......................................................................................................................................6-2
7. TROUBLESHOOTING AND MAINTENANCE .............................................................................................................7-1
7.1. WARRANTY INFORMATION.....................................................................................................................................................7-1
7.2. RECOMMENDED PREVENTIVE MAINTENANCE.................................................................................................................... 7-1
7.3.7. To Disable/Enable DishScan............................................................................................................................. 7-5
7.3.8. Satellite Reference Mode................................................................................................................................... 7-5
7.3.9. To Read/Decode an ACU Error Code 0008 (Pedestal Error):.......................................................... 7-6
7.1. MAINTENANCE .......................................................................................................................................................................7-16
8. SPECIFICATIONS......................................................................................................................................................................7-18
8.1. INSTALLED WEIGHT..................................................................................................................................................................8-1
8.2. ANTENNA REFLECTOR/FEED ASSEMBLY...............................................................................................................................8-1
8.3. RADOME ASSEMBLY..................................................................................................................................................................8-1
8.4. STABILIZED PEDESTAL ASSEMBLY.........................................................................................................................................8-2
8.5. PEDESTAL CONTROL UNIT (PCU) ASSEMBLY.....................................................................................................................8-2
8.6. ENVIRONMENTAL CONDITIONS .............................................................................................................................................8-3
8.7. CONTROL AND IF COAX CABLES............................................................................................................................................8-3
8.7.1. Antenna L-Band TVRO IF Coax Cables (Customer Furnished) ...................................................... 8-3
8.7.2. Multi-conductor Cables (Customer Furnished) ..................................................................................... 8-3
Gyro Compass Interface Cable (Customer Furnished)....................................................................................... 8-3
9. DRAWINGS........................................................................................................................................................................................9-1
9.1. MODEL DTV04 HD SPECIFIC DRAWINGS .........................................................................................................................9-1
9.2. MODEL DTV04 HD GENERAL DRAWINGS .........................................................................................................................9-1

DTV04 HD TVRO Antenna Introduction
1-1
1. Introduction
1.1. General Description of system
This shipboard TeleVision Receive Only (TVRO) system provides you with maritime DIRECTV® satellite
programming while you are inport or underway. Your DTV04 HD Antenna system will automatically locate
and receive signals of adequately high E.I.R.P. levels (see the Specifications section of this manual), in
circular polarization mode from 5 geosynchronous DIRECTV satellites in both Ku-band and Ka-Band
simultaneously. This input will be distributed to all of your satellite TV receivers which will provide the
Audio/Video to your televisions.
The DTV04 HD system is a fully stabilized antenna that has been designed and manufactured so as to be
inherently reliable, easy to maintain, and simple to operate. Except for start-ups, or when changing to
operate with different transponders, the equipment essentially permits unattended operation.
The DTV04 HD system consists of two major groups of equipment; an above-decks group and a below-
decks group. Each group is comprised of the items shown, and listed, below. All equipment comprising the
Above Decks is incorporated inside the radome assembly and is integrated into a single operational entity.
In addition to the provided equipment this system requires an unobstructed line-of-sight view to the
satellites, ships Gyro Compass input and AC electrical power. The IF signals from the antenna are
distributed to the satellite receivers by the matrix switch. Video and Audio outputs from your satellite
receivers are available for distribution and monitoring.
Figure 1-1 DTV04 Simplified Block Diagram Components

Introduction DTV04 HD TVRO Antenna
1-2
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 with built-in GPS
2. 32.5” Offset Antenna Reflector
3. Feed Assembly with DIRECTV 5 LNB
4. 50” Radome Assembly
B. Below-Decks Equipment Group
5. DAC-2202 Antenna Control Unit
6. (Customer furnished) DIRECTV 5 LNB compatible active Matrix Switch with desired number of
outputs (one output required for ACU Tracking receiver and one output for each installed satellite
receivers).
7. (Customer furnished) Satellite Video Receiver(s) & Television(s)
8. (Customer furnished) Required Coaxial, Serial, Audio/Video, and AC Power Cables.
1.2. General scope of this manual
This manual describes the Sea Tel Model DTV04 HD Antenna (also called the Above Decks Equipment), its
operation and installation. The Below Decks Equipment is described in the manuals provided with your
DAC-2202 Antenna Control Unit
1.3. 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 TVRO Antenna are all
contained in this manual

DTV04 HD TVRO Antenna Operation
2-1
2. Operation
Operation of your system is accomplished from the Antenna Control Unit (ACU). Please refer to the operation
section of the DAC-2202 Antenna Control Unit manual.
2.1. System Power-up
Turn ON the power switch on the front panel of the ACU. The DTV 04 HD Antenna receives its DC power
from the Antenna Control Unit (ACU) when the ACU is energized.
The ACU supplies +30 VDC and FSK Modulated RS422 at 70 KHz (TX) & 120 KHz (RX) to the ADE on the
Antenna Control Coax Cable.
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.
Step 1. Turn on the AC power switch at the ACU front panel. Verify the level platform motor drives
the level cage CCW to the stop and then CW 45 degrees.
Step 2. Verify the antenna moves forward or back to bring the top of the level cage to a level
position in the fore/aft direction. This step takes approximately 10 seconds and will result in the
dish being at 45 degrees in elevation. The level cage may still be tilted left or right at this time.
Step 3. After the level cage is positioned in the fore/aft direction, verify the antenna moves left or
right to bring the top of the level cage to a level position in the left/right direction. This step also
takes approximately 10 seconds.
Step 4. After the level cage is positioned in the left/right direction, verify the antenna moves CW
(up) in azimuth to the upper stop where the Relative position of the antenna will be 700.0 degrees.
From this point on the encoder will increment and/or decrement the Relative position of the
antenna. Next, the antenna will drive CCW (down) in azimuth to a Relative position of 630.0.
The antenna will report its status, the PCUs model number & software version and the position information
(current Relative, Azimuth and Elevation ) to the ACU.
If any of these steps fail, or the ACU reports model number as "xx04" re-configure the PCU as described in
section the Setup section of the AU manual. If initialization still fails, refer to the troubleshooting section of
this manual.
2.3. Antenna Stabilization
After initialization is complete, real-time stabilization of the antenna is an automatic function of the PCU.
2.4. Antenna Pedestal Operation
Operation of the stabilized antenna Pedestal Control Unit (PCU) is accomplished remotely by the DAC-2202
Antenna Control Unit (ACU). Refer to the Operation section of the DAC-2202 Antenna Control Unit (and/or
TSC-10 Touch Screen Controller) manual for more specific operation details. There are no other operating
instructions applicable to the pedestal assembly by itself.

Operation DTV04 HD TVRO Antenna
2-2
2.5. Tracking Operation
The design of this system allows for simultaneous reception of 5 satellites, 3 at Ku-Band and 2 at Ka-Band.
For the DTV04 HD Antenna system all tracking parameter entries are based on signal level received from
101°W.
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, or from the
optional Touch Screen Controller.
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 issues the appropriate Azimuth and/or Elevation steps to the antenna, as needed.
2.6. Reflector Skew Operation
In addition to azimuth and elevation pointing angle requirements, it is necessary to skew the angle of the
reflector to the satellite. This is to properly align the LNBF assembly array with the desired satellites. The
required amount of skew in degrees (CW or CCW) from center of range is based on the vessels geographic
location and DIRECTV satellite 101°W. To facilitate this need, your antenna is equipped with a Reflector
Skew motor and potentiometer feedback. Other than initial calibration, this function does not require any
user intervention or adjustments.
Refer to the maintenance section of this manual for procedures to align and optimize this tilt angle while in
Auto-Pol mode.
2.7. Low Noise Block Converter Operation
Your system has a DirecTV 5 LNB feed assembly installed onto it for simultaneous reception of 99°W,
101°W, 103°W, 110°W, & 119°W. There are no operating instructions applicable to the LNB’s via the
Antenna Control Unit. The feed is energized and controlled by the DirecTV 5 LNB compatible active matrix
switch and DirecTV compatible satellite receiver(s).
The received Satellite signals are circular polarized (spiraling plane down from the satellite) at both Ku and
Ka-band Frequency range. This system is specifically designed to work with DirecTV service and therefore
does not support tracking of Linear Satellite signals.
2.8. 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.

DTV04 HD TVRO Antenna Basic System Information
3-1
Figure 3-1 Arc of viewable Satellites
3. Basic System Information
This section provides you with some additional information about the satellites you will be using, basics of the your
Series 04 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).
These 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 TV Station antenna could do. Because
of their high vantage point, they are able to cover an area that is larger than a continent.
Your DTV04 HD antenna is designed to be used with DIRECTV Satellites that operate at both the Ku-Band
(12.2-12.7GHz) and Ka-Band (18.3 – 18.8GHz and 19.7 – 20.2GHz) in this orbit that have a strong enough
receive signal level in your location.
3.1.1.
The three satellites that your system will be tracking, 101°W, 110°W, and 119°W operate in
the12.2-12.7GHz range. 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
3.1.2.
The two satellites that your system will be tracking, 99°W and 103°W operate in the18.3 to
20.2GHz range. 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.
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. Typically Ka-Band signals are more sensitive to the
effects of rain fade and other environmental factors when compared to Ku-Band signals
transmitted at the same power level.
Ka-Band Frequency

Basic System Information DTV04 HD TVRO Antenna
3-2
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.
Due to the nature of the reflector/feed design it is possible to have blockage to 1 or
more satellites even while actively tracking 101ºW.
•The graphic to the right depicts a
vessel with its’ BOW oriented such
that the two “diesel Stacks” at the
vessels aft are situated so that they
do not cause any physical blockage,
thus allowing full line of site to all 5
DIRECTV satellites.
Figure 3 System tracking with line of site to all 5 satellites*
•The graphic to the right depicts a
vessel with its’ BOW oriented such
that the two “diesel Stacks” at the
vessels aft are situated so that they
do cause physical blockage thus
allowing line of site to only 2 of the 5
DIRECTV satellites. Satellites 99ºW,
101ºW, and 103ºW are blocked by
the two stacks. This is the only
scenario (of the three examples listed
on this page) where a properly
defined blockage zone would trigger a
BLOCKED status.
•The graphic to the right depicts a
vessel with its’ BOW oriented such
that the two “diesel Stacks” at the
vessels aft are situated so that they
cause partial physical blockage thus
allowing line of site to only 3 of the 5
DIRECTV satellites. Satellites 110ºW
and 119ºW are blocked by the two
stacks.
*For illustration purposes only. The
relative azimuth angle(s) between the antenna and the satellites shown in these graphic are exaggerated
and not drawn to scale. The actual relative azimuth delta between the 5 satellites will vary and is based
on the vessels current geographic location.
Figure 4 System in a blocked condition*
Figure 5 System in a partially blocked condition.*

DTV04 HD TVRO Antenna Basic System Information
3-3
Figure 3-5 Satellite Signal Polarization
3.1.3.
The level of the receive signal at any given geographic location globe is dependent upon how
powerful the transmission is and how wide the signal beam 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 satellites meets (or exceeds) the minimum satellite signal
level required for the antenna (refer to the Specifications section of this manual) to provide suitable
reception. This signal level requirement may limit the number of satellites that can be used and the
geographic areas where the ship can travel. 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. Tracking decisions
are based on single satellite and therefore is possible to have your system report proper tracking
status and still not be within coverage of one of the other 4 satellites.
Signal level
3.1.4.
Satellites may transmit their signals in one of two
different polarization modes, linear (like a flat ribbon
down from the satellite) or circular (like a twisted
ribbon spiraling down from the satellite). The
DTV04 HD antennas are designed to receive
circular satellite signals only.
Satellite polarization
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.
The clockwise, or counter-clockwise, rotation of the antenna is called Azimuth rotation. The
antenna can rotate a total of 680 degrees between two mechanical stops. Azimuth drive, provided
by the azimuth motor, is required during stabilization, searching, tracking and unwrap operations of
the antenna. As the boat turns, azimuth is driven in the opposite direction so the dish remains
pointed at the desired satellite. The actual azimuth pointing angle to the satellite is determined by
the ships latitude & longitude and the longitude of the satellite. It is important to know that the
antenna should be pointed (generally) toward the equator.
If the ship is in the Northern Hemisphere, the azimuth angle to the satellite would be 180 degrees
true (relative to true north) if the satellite is on the same longitude as the ship. 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 top to see if the dish is aimed the correct direction (towards the
equator).
Azimuth
3.2.2.
The antenna can physically be rotated in elevation from –15 degrees (lower stop) to +110 degrees
(upper stop). However, you will only be pointing elevation between 00.0 (horizon) and 90.0
(zenith). 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 the ship is at a high latitude and will increase as the ship gets
closer to the equator.
Elevation

Basic System Information DTV04 HD TVRO Antenna
3-4
Additionally, from any given latitude, the elevation will be highest when the desired satellite is at
the same longitude that you are on (refer to figure 3-1). If the desired satellite is east, or west, of
your longitude the elevation angle will be lower.
3.2.3.
This section if comprised of a stamped aluminum offset reflector with a
DIRECTV Slimline Ku/Ka band 5LNBF assembly. This assembly is also
fitted with a 24Vdc tilt motor and a potentiometer for position
feedback required for proper reflector skew which is remotely
controlled by the DAC2202 based on the vessels GEO location.
Antenna Reflector/Feed Assembly
3.2.4.
The DTV04 HD antennas are 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
3.2.5.
Whenever the desired satellite
signal is lost the Antenna Control
Unit after a preprogrammed time
delay 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 and identifying the signal. Tracking optimizes the pointing of the antenna to get the
highest signal level from the satellite.
3.2.6.
The Satellite Identification Receiver located in the Antenna Control Unit (ACU) is used to acquire,
identify and track a specific satellite by a unique network ID code (NID). The receiver must be set
up properly for the satellite you wish to find & track. These receiver settings should be saved to
expedite finding, or re-acquiring, the desired satellite in the future.
When searching for a desired satellite, this receiver compares any satellite ID it finds to the saved
satellite ID code. If the ID code does not match the antenna will continue searching until the
correct satellite is found. The system must have adequate satellite signal level, AND the matching
ID, to stop searching (and continue tracking the desired satellite).
If you have the optional Touch Screen Controller (TSC-10) you can setup multiple “favorite
satellites” and subsequently switch to different “favorite” satellite with two touches on the main
(home) screen.
Tracking Receiver - Satellite Identification Receiver
Figure 7Antenna
Reflector/Feed Assembly

DTV04 HD TVRO Antenna Basic System Information
3-5
3.2.7.
The DTV04 HD antenna 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 from DIRECTV at 101°W. Evaluation of this
information is used to continuously make minor pointing corrections to keep the signal level
“peaked” as part of normal operation.
Tracking
3.2.8.
Mechanical stops limit the azimuth rotation to a total of 690 degrees. The mechanical stops are at
Relative 020.0 and 700.0. When the azimuth rotation is within 3 degrees of either mechanical stop,
the antenna will be driven 360 degrees away from that stop. This “Unwraps“ (unwinds) the cables
that are routed through the pedestal assembly so that they do not become too severely twisted. It
also repositions the antenna to a point which is closer to the middle of its mechanical stops.
UNWRAP should occur when the Relative position of the antenna is at 023.0 or 697.0.
By rotating 360 degrees the azimuth position of the antenna will have returned to the previous
Azimuth position and will resume tracking the desired satellite. Unwrap will occur whenever the
boat has turned far enough in one direction for it to be required. It is normal for the satellite signal
to be lost, and the television picture to “freeze frame”, until the antenna completes unwrap and
resumes tracking the satellite.
Unwrap

Basic System Information DTV04 HD TVRO Antenna
3-6
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.
Figure 3-8 DTV04 HD Simplified Block Diagram
The DTV04 04 Antenna system is comprised of two major sections: The Above-Decks Equipment (ADE) is
comprised solely of the DTV04 HD 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, may include
the optional Touch Screen Controller panel, satellite receiver(s), TV set(s) and all other ancillary equipment
that is mounted in various locations throughout the interior of the boat.

DTV04 HD TVRO Antenna Basic System Information
3-7
3.3.1.
The Above Decks Equipment consists of an Antenna Pedestal inside a Radome assembly. The
pedestal consists of a DIRECTV Slimline antenna dish & feed with 5 circular Low Noise Block
converter (LNBFs) with a reflector skew motor mounted on a stabilized antenna pedestal. 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.
Antenna ADE Assembly
The antenna control coax cable is connected
between the antenna radome assembly and
the antenna control unit. This cable provides
DC voltage to the antenna and all control
signals to and from the antenna.
Five other RG-6 (or better) coax cables are
installed from the antenna radome assembly
to the below decks equipment. These four
cables carry the intermediate frequency (950-
1450MHz for Ku-Band Converted
Frequencies, 250-750MHz and 1650-
2150MHz for Ka-Band Converted
Frequencies) signals from the antenna
assembly directly to the DIRECTV 5LNB
compatible active matrix switch as well as the DC Voltage & Tone switching from the Matrix Switch
to the LNB. The Fifth coax installed is intended as a spare.
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 panel be
mounted near one of the Satellite Receiver locations where you can see the television screen while
you are controlling the antenna.
The Antenna Control Unit is connected to the antenna, ships Gyro Compass and to the optional
Touch Screen Controller (when included).
Antenna Control Unit
Figure 3-10 DAC-2200 Antenna Control Unit
The Antenna Control Unit (ACU) communicates via an 70/120 KHz full duplex data link with the
Pedestal Control Unit (PCU) located on the antenna. This control signal is sent up the Antenna
Control Coax cable along with the DC voltage for the antenna power. 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.
Figure 3-9 DTV04 HD Above Decks Equipment

Basic System Information DTV04 HD TVRO Antenna
3-8
3.3.3.
AC Voltage -An appropriate source of AC Voltage (preferably from a Uninterrupted Power
Supply) will also be required for the ACU, satellite receivers and television monitors. Refer to the
manuals for these devices for voltage and power consumption of each. Total power consumption
will depend on the number of satellite receivers and television monitors used.
Power Supply
3.3.4.
The DTV04 HD Antenna system is designed to be used with DIRECTV compatible satellite receivers.
When authorized, the satellite receiver will decode the encrypted signals and provide the audio
visual output for your installed televisions(s). Authorizing the receiver-decoder is a process of
registering your receiver(s) and paying subscription fees to the service provider (DIRECTV Satellite
Television®). The service provider then arranges for a signal to be sent through the satellite to your
receiver-decoder, which will “enable” it to decode the programming you subscribed to.
A coax connection from the antenna (via the matrix switch) provides signal input to the receiver.
The receiver also outputs voltage and tone control to the matrix switch to select the correct
satellite and polarization signal for the channel you want to watch.
Satellite Receivers
3.3.5.
An appropriate television monitor is used to view the satellite television programming and the on
screen displays from the receiver. Your television/monitor must be able to display the video
standard outputted from the satellite receiver. Consult your Television/Monitor manual for
specifics.
Television/Monitor
3.3.6.
The DTV04 HD Antenna system requires a Multiswitch which is compatible with the DIRECTV
Slimline 5 LNB Feed assembly. This Matrix Switch routes the satellite signal from one of the IF
cables to one of your receivers. As you change channels on the satellite receiver, it uses the
voltage, and/or tone, to select the correct signal input for the channel you have selected.
Each output of the matrix switch is controlled by voltage, and/or tone, from the satellite receiver
connected to that output connector. The combination of Voltage level and a sensed 22KHz tone
selects which satellite and polarity is provided to that receiver, Each output of the matrix switch
operates independently of the others, therefore allowing the satellite receivers to operate
independent of each other.
The matrix switch is normally installed with the Below Decks Equipment. IF coax cables are
connected from the LNB inputs to the Multiswitch inputs and then a coax cable (RG-6 OR greater) is
connected from one of its outputs to each satellite receiver. One of these outputs must be
connected to the tracking receiver in the DAC2202. Multiswitch’s are available at the time of
purchase from Sea Tel for 12 outputs (SMS 41209 WBP Sea Tel P/N 130010-1) for support of up to
11 receivers and 16 outputs (SMS 41609 WBP Sea Tel P/N 130010-2) for support of up to 15
receivers. Contact the Sea Tel Service department for distribution of >15 receivers.
Matrix Switch

DTV04 HD TVRO Antenna Installation
4-1
4. Installation
Below are basic steps to guide you in installing this equipment, but you may choose to complete the installation
steps in a different order. Read this complete section before starting. Installation of the DAC-2202 Antenna
Control Unit may have already have been performed using its Installation and Operation manual instructions.
The following instructions describe the installation procedures for installing the Series 04 Antenna (ADE).
4.1. General Cautions & Warnings
CAUTION -Allow only an authorized dealer to install or service the your Sea Tel Television
Receive Only System components. Unauthorized installation or service can be dangerous and
can invalidate the warranty.
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
7/16-14 376
1/2-13 517
NOTE: All nuts and bolts should be assembled using the appropriate Loctite thread-locker
product number for the thread size of the hardware.
Loctite # Description
222 Low strength for small fasteners.
243 Medium strength, oil tolerant.
262 Permanent strength for up to ¾” diameter fasteners.
271 Permanent strength for up to 1” diameter fasteners.
290 Wicking, High strength for fasteners which are already assembled.
4.2. Site Survey
The site survey is performed to decide where the best location for the equipment to be installed is. The
radome assembly (ADE) should be installed at a location aboard ship where:
1. The antenna has a clear line-of-sight to as much of the sky (horizon to zenith at all bearings) as is
practical.
2. The antenna is a minimum of 15 feet from the ship’s radar, especially high power radar arrays.
3. 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.
4. The antenna is a minimum of 15 Feet from high power short wave transmitting antennas are not in
close proximity.
5. The antenna must be installed in a rigid mounting location that will not flex, or sway, in ship’s
motion or vibration.
6. 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.

Installation DTV04 HD TVRO Antenna
4-2
If these conditions cannot be entirely satisfied, the site selection will inevitably be a “best” compromise
between the various considerations. However, the warranty of the antenna will not cover physical or
electrical (RF) damage of the antenna due to the compromised location.
4.3. Preparing For The Installation
4.3.1.
Exercise caution when unpacking the equipment crate(s). Carefully inspect the radome surface for
evidence of shipping damage.
Unpack Shipping Crates
4.3.2.
Install appropriate cables from ADE to the BDE Location. Exercise caution during the cable
installation to assure that the cables are not severely bent (proper bend radius) or twisted and that
connectors are not damaged. Ensure that the cables have been run through watertight fittings
and/or will not permit water entry into the boat when the installation is completed.
Installing The Cables
4.4. Preparing the ADE for Lift
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. The antenna pedestal is shipped completely assembled in its radome.
2. Remove the shipping nuts which mount the ADE to the pallet.
3. Attach a four part web strap lifting sling to the four lifting pad eyes on the radome lip.
4. Using the web strap lifting sling arrangement, and with a tag line attached near the radome base,
hoist the antenna assembly to its assigned location aboard the ship by means of a suitably sized
crane or derrick.
5. The radome assembly should be positioned with the BOW marker aligned as close as possible to the
centerline of the ship. Small variations from actual alignment can be compensated with the
AZIMUTH TRIM adjustment in the ACU, so precise alignment is not required.
6. Bolt the radome base directly to the ship's deck or mounting plate (flat mounting area).