COBHAM Sea Tel 6011-4 User manual

EAR Controlled -ECCN EAR99
This technical data is subject to US Government export control in accordance with the
Export Administration Regulations. Export of this data to any foreign country, or disclosure
of this data to a Non-US person, may be a violation of Federal law.
Sea Tel, Inc.
(trading as Cobham SATCOM)
4030 Nelson Avenue
Concord, CA 94520
Tel: [phone]
Fax: [phone]
Thrane & Thrane A/S
(trading as Cobham SATCOM)
Lundtoftegaardsvej 93 D, 2800 Kgs.
Lyngby, Denmark
Tel: [phone]
Fax: [phone]
Web: http://www.cobham.com/satcom Email:
[e-mail]
August 31, 2018 Document. No. 99-133136-A
EAR Controlled -ECCN EAR99
Sea Tel
6011-4 C/Ku-Band TVRO Satellite Antenna
Installation Manual

Sea Tel 6011-4
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Sea Tel Marine Stabilized Antenna systems are assembled in the United States of
America.
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 is an ISO 9001:2015 registered company. Certificate Number
13690 originally issued March 14, 2011 and was renewed/reissued on
March 13, 2018.
RED
2014/53/EU
Cobham SATCOM declares that the Sea Tel TVRO Maritime Satellite Earth Stations
are in compliance with The Radio Equipment Directive 2014/53/EU. The full text of
this Self Declaration of Conformity for this equipment is contained in this manual.
Copyright Notice
Copyright © 2017 Sea Tel Inc. 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 prior written consent of Sea
Tel, Inc. The information in this document is subject to change without notice. Sea Tel Inc. is also doing business as
Cobham SATCOM.
Revision History
REV DCO# Date Description By
A 00026901 August 31, 2018 99-134136-A supersedes 134136. Reformat, update text, specs
and drawings.
MDN

Document Number 99-160338-B
Sea Tel Inc.
4030 Nelson Ave., Concord
California, 94520, USA
T: [phone]
F: [phone]
RED Declaration of Conformity
Sea Tel Inc. declares under our sole responsibility that the products identified below are in
conformity with the requirements of:
RED Directive 2014/53/EU concerning maritime Radio Equipment as described in the
harmonized standards listed below and the mutual recognition of their conformity.
Product Names:
3004 Ku Band TVRO Maritime Satellite Earth Station.
4004 Ku Band TVRO Maritime Satellite Earth Station.
5004 Ku Band TVRO Maritime Satellite Earth Station.
6004 Ku Band TVRO Maritime Satellite Earth Station.
6009 C-Band TVRO Maritime Satellite Earth Station.
6011 C/Ku Band TVRO Maritime Satellite Earth Station.
ST24 Ku Band TVRO Maritime Satellite Earth Station.
ST88-21 C/Ku Band TVRO Maritime Satellite Earth Station.
ST94-21 C/Ku Band TVRO Maritime Satellite Earth Station.
ST144-21 C/Ku Band TVRO Maritime Satellite Earth Station.
Harmonized Standards:
EMC:
EMC standard for Radio Equipment (Maritime) ETSI EN 301 843-1 V2.1.1 (2016-03)
Marine Navigational and Radio Communications
Equipment –General Requirements: IEC 60945:2002 (Reference Only)
Safety:
Safety of information technology equipment: IEC 60950-1:2005+A12:2011
Certificates of Assessment were completed and are on file at NEMKO USA Inc, San Diego, CA and
BACL Labs, Santa Clara, CA.
Sea Tel, Inc
Concord, CA
___________________________________ 09 Feb 2018
Peter Blaney, Chief Engineer Date

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Table of Contents Sea Tel 6011-4
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1. SAFETY ........................................................................................................................................1-1
2. ST60 SERIES SYSTEM CONFIGURATION(S) ....................................................................................2-1
2.1. SYSTEM CABLES ................................................................................................................................... 2-1
2.2. OTHER INPUTS TO THE SYSTEM ............................................................................................................... 2-1
2.3. SIMPLIFIED BLOCK DIAGRAM OF A 6011-4 SYSTEM .................................................................................... 2-1
3. SITE SURVEY - SHIPBOARD........................................................................................................... 3-1
3.1. SITE SELECTION ABOARD THE SHIP ......................................................................................................... 3-1
3.2. ANTENNA SHADOWING (BLOCKAGE)AND RF INTERFERENCE ....................................................................... 3-1
3.3. MOUNTING FOUNDATION....................................................................................................................... 3-2
3.3.1. Mounting on Deck or Deckhouse ............................................................................................... 3-2
3.3.2. ADE Mounting Considerations................................................................................................... 3-2
3.3.3. Sizing of the support pedestal ................................................................................................... 3-2
3.4. MOUNTING HEIGHT ............................................................................................................................... 3-3
3.5. MAST CONFIGURATIONS ........................................................................................................................ 3-3
3.5.1. Vertical Masts .......................................................................................................................... 3-3
3.5.2. Raked Masts ............................................................................................................................ 3-4
3.5.3. Girder Masts............................................................................................................................. 3-5
3.5.4. Truss Mast ............................................................................................................................... 3-5
3.6. SAFE ACCESS TO THE ADE ..................................................................................................................... 3-5
3.7. BELOW DECKS EQUIPMENT LOCATION ..................................................................................................... 3-5
3.8. CABLES ............................................................................................................................................... 3-6
3.8.1. ADE/BDE Coaxial Cables........................................................................................................... 3-6
3.8.2. Antenna Power Cable ............................................................................................................... 3-6
3.8.3. ACU Power Cable/Outlet............................................................................................................3-7
3.8.4. Gyro Compass Cable..................................................................................................................3-7
3.9. GROUNDING......................................................................................................................................... 3-7
4. INSTALLATION.............................................................................................................................4-1
4.1. UNPACKING AND INSPECTION ................................................................................................................. 4-1
4.2. ASSEMBLY NOTES AND WARNINGS.......................................................................................................... 4-1
4.3. INSTALLING THE ADE ............................................................................................................................ 4-2
4.3.1. Prepare the 40”, 50”, 60”, 66” or 76” Radome Assembly............................................................. 4-2
4.3.2. Install 76” Radome to the mounting platform ............................................................................ 4-3
4.4. GROUNDING THE PEDESTAL.................................................................................................................... 4-6
4.5. REMOVING THE SHIPPING/STOW RESTRAINTS PRIOR TO POWER-UP........................................................... 4-6
4.5.1. Removing the AZ Shipping/Stow Restraint ................................................................................ 4-7
4.5.2. Removing the EL Shipping/Stow Restraint................................................................................. 4-7
4.5.3. Removing the CL Shipping/Stow Restraint................................................................................. 4-9
4.1. CABLE INSTALLATION .......................................................................................................................... 4-10
4.1.1. Shipboard Cable Installation ................................................................................................... 4-10
4.1.2. ADE-BDE IF Cable Assignments .............................................................................................. 4-10
4.2. INSTALLING THE BELOW DECKS EQUIPMENT. .......................................................................................... 4-10
4.2.1. General Cautions & Warnings ................................................................................................. 4-10
4.2.2. Preparing BDE Location.......................................................................................................... 4-10
4.2.3. Installing the Below Deck Equipment....................................................................................... 4-10
4.3. CONNECTING THE BELOW DECKS EQUIPMENT ......................................................................................... 4-11

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4.3.1. Connecting the ADE AC Power Cable .......................................................................................4-11
4.3.2. Connecting the BDE AC Power Cables......................................................................................4-11
4.3.3. Connecting the ADE-BDE IF Coaxes .........................................................................................4-11
4.3.4. Antenna Control Unit Connections...........................................................................................4-11
4.3.5. Terminal Mounting Strip (TMS) Connections ............................................................................4-12
4.4. FINAL CHECKS..................................................................................................................................... 4-13
4.4.1. Visual/Electrical inspection ......................................................................................................4-13
4.4.2. Electrical - Double check wiring connections .............................................................................4-13
4.5. POWER-UP......................................................................................................................................... 4-13
4.6. 61BANTENNA MAINTENANCE ............................................................................................................... 4-13
4.6.1. Balancing the Antenna............................................................................................................4-13
4.6.2. Fine Balance and Monitoring Motor Drive Torque .....................................................................4-14
5. BASIC SETUP OF THE ACU............................................................................................................ 5-1
5.1. OPERATOR SETTINGS .............................................................................................................................5-1
5.2. SETUP PARAMETER DISPLAY AND ENTRY MENUS......................................................................................5-1
5.3. DEFAULT SETUP PARAMETERS FOR YOUR ANTENNA ...................................................................................5-1
5.4. SAVE NEW PARAMETERS ....................................................................................................................... 5-2
6. SETUP –SETTING UP THE DUAL REFLECTORS............................................................................. 6-1
6.1. OPTIMIZING C-BAND (REFLECTOR A)....................................................................................................... 6-1
6.2. OPTIMIZING KU-BAND (REFLECTOR B)..................................................................................................... 6-2
7. SETUP – SHIPS GYRO COMPASS................................................................................................... 7-1
7.1. GYRO TYPE........................................................................................................................................... 7-1
7.2. UPDATING THE GYRO TYPE PARAMETER ................................................................................................. 7-1
7.3. IF THERE IS NO SHIPS GYRO COMPASS...................................................................................................... 7-1
8. SETUP – TRACKING RECEIVER...................................................................................................... 8-1
8.1. DETERMINING THE IF TRACKING FREQUENCY (FREQ OR MHZ).....................................................................8-1
8.1. KHZ....................................................................................................................................................8-1
8.2. FEC.....................................................................................................................................................8-1
8.2.1. L-Band SCPC Receiver...............................................................................................................8-1
8.3. TONE...................................................................................................................................................8-1
8.3.1. TVRO Applications ....................................................................................................................8-1
8.4. VOLT .................................................................................................................................................. 8-2
8.4.1. TVRO Application..................................................................................................................... 8-2
8.5. SKEW ................................................................................................................................................ 8-2
8.6. NID.................................................................................................................................................... 8-2
9. SETUP -BAND & REFLECTOR SELECT.......................................................................................... 9-1
9.1. BAND,LOW NOISE BLOCK CONVERTER OPERATION AND REFLECTOR SELECTION:.......................................... 9-1
10. SETUP – TARGETING................................................................................................................... 10-1
10.1. OPTIMIZING QOR DUAL REFLECTOR TARGETING ..................................................................................... 10-1
10.1.1. Optimizing C-Band (Reflector A) Targeting...............................................................................10-1
10.1.2. Optimizing Ku-Band (Reflector B) Targeting.............................................................................10-1
10.2. AUTO TRIM ......................................................................................................................................10-2
10.3. MANUALLY OPTIMIZING TARGETING.......................................................................................................10-2
10.4. EL TRIM............................................................................................................................................ 10-3
10.5. AZ TRIM ........................................................................................................................................... 10-3
11. SETUP – HOME FLAG OFFSET......................................................................................................11-1

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11.1. ELECTRONIC CALIBRATION OF RELATIVE ANTENNA POSITION (HOME FLAG OFFSET) ......................................11-1
11.1.1. You Found a Large AZ TRIM value:.......................................................................................... 11-2
11.1.2. You Observe “Home” Pointing is LEFT of the Bow-line:............................................................. 11-2
11.1.3. You Observe “Home” Pointing is RIGHT of the Bow-line: ...........................................................11-3
11.1.4. To Enter the HFO value in the DAC_2202: ................................................................................11-3
11.2. MECHANICAL CALIBRATION OF RELATIVE ANTENNA POSITION (HOME FLAG OFFSET).................................... 11-4
12. SETUP – SEARCHING .................................................................................................................. 12-1
12.1. SEARCHING OPERATION....................................................................................................................... 12-1
12.1.1. Default Standard (Box) Search Pattern ................................................................................... 12-1
12.1.2. Inclined Orbit Search Pattern .................................................................................................. 12-2
12.1.3. No Gyro Search Pattern.......................................................................................................... 12-3
12.2. CHANGING THE SEARCH PARAMETERS.................................................................................................... 12-4
12.2.1. AUTO THRES ......................................................................................................................... 12-4
12.2.2. EL STEP SIZE ......................................................................................................................... 12-4
12.2.3. AZ STEP SIZE......................................................................................................................... 12-5
12.2.4. STEP INTEGRAL..................................................................................................................... 12-5
12.2.5. SEARCH INC .......................................................................................................................... 12-5
12.2.6. SEARCH LIMIT ....................................................................................................................... 12-5
12.2.7. SEARCH DELAY ..................................................................................................................... 12-5
12.2.8. SWEEP INC ............................................................................................................................ 12-6
12.3. SAVE NEW PARAMETERS...................................................................................................................... 12-6
13. SETUP – BLOCKAGE & RF RADIATION HAZARD ZONES................................................................ 13-1
13.1. RADIATION HAZARD AND BLOCKAGE MAPPING (AZ LIMIT PARAMETERS) ....................................................13-1
13.2. SAVE NEW PARAMETERS.......................................................................................................................13-5
14. SETUP – OTHER PARAMETERS.................................................................................................... 14-1
14.1. SETUP PARAMETER DISPLAY AND ENTRY MENUS. ................................................................................... 14-1
14.2. 5V OFFSET (MAY NOT BE IN YOUR SOFTWARE)....................................................................................... 14-1
14.3. 5V SCALE (MAY NOT BE IN YOUR SOFTWARE)......................................................................................... 14-1
14.4. REMOTE COMMAND ...................................................................................................................... 14-1
14.5. REMOTE MONITOR......................................................................................................................... 14-1
14.6. TO DISABLE/ENABLE DISHSCAN® ......................................................................................................... 14-1
14.7. SATELLITE REFERENCE MODE ............................................................................................................... 14-2
14.8. REMOTE PARAMETERS .................................................................................................................. 14-2
15. STOWING THE ANTENNA ........................................................................................................... 15-1
15.1. INSTALLING THE STOW RESTRAINTS........................................................................................................15-1
15.1.1. Installing the AZ Shipping/Stow Restraint ................................................................................15-1
15.1.2. Installing the EL Shipping/Stow Restraint................................................................................ 15-2
15.1.3. Installing the CL Shipping/Stow Restraint.................................................................................15-3
15.2. REMOVING THE SHIPPING/STOW RESTRAINTS PRIOR TO POWER-UP......................................................... 15-4
15.2.1. Removing the AZ Shipping/Stow Restraint .............................................................................. 15-4
15.2.2. Removing the EL Shipping/Stow Restraint............................................................................... 15-5
15.2.3. Removing the CL Shipping/Stow Restraint............................................................................... 15-6
16. OPERATION ............................................................................................................................... 16-1
16.1. TARGET A C-BAND SATELLITE ............................................................................................................... 16-1
16.2. TARGET FROM AC-BAND SATELLITE TO ANOTHER C-BAND SATELLITE ...................................................... 16-2
16.3. TARGET A KU-BAND SATELLITE FROM AC-BAND SATELLITE ..................................................................... 16-4

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16.4. TARGET FROM AKU-BAND SATELLITE TO ANOTHER KU-BAND SATELLITE.................................................. 16-6
16.5. QUICK REFERENCE FLOWCHART -CHANGING SATELLITES WITH A 6011-4 QOR TVRO ANTENNA SYSTEM........16-8
17. FUNCTIONAL TESTING ............................................................................................................... 17-1
17.1. ACU /ANTENNA SYSTEM CHECK ........................................................................................................... 17-1
17.2. LATITUDE/LONGITUDE AUTO-UPDATE CHECK .......................................................................................... 17-1
17.3. HEADING FOLLOWING .......................................................................................................................... 17-1
17.4. BLOCKAGE SIMULATION TEST................................................................................................................ 17-2
17.5. FOUR QUADRANT TRACKING TEST ......................................................................................................... 17-2
18. INSTALLATION TROUBLESHOOTING ..........................................................................................18-1
18.1. WARRANTY INFORMATION .................................................................................................................... 18-1
18.2. TROUBLESHOOTING THE ACU ............................................................................................................... 18-1
18.2.1. ACU display is blank ................................................................................................................18-1
18.2.2. ACU Status displays "REMOTE NOT RESPONDING" ................................................................18-2
18.3. TROUBLESHOOTING SHIPS GYRO COMPASS PROBLEMS .............................................................................18-2
18.3.1. STEP-BY-STEP........................................................................................................................18-2
18.3.2. 1:1 SYNCHRO .........................................................................................................................18-2
18.3.3. 360:1 Synchro .........................................................................................................................18-3
19. MAINTENANCE...........................................................................................................................19-1
19.1. C-BAND FEED ASSEMBLY POLARITY SELECTION:......................................................................................19-1
19.2. REPLACING THE KU-BAND LNB.............................................................................................................19-2
19.2.1. Replacing or Changing LNBs....................................................................................................19-2
19.3. OPTIMIZING KU-BAND LINEAR POLARIZATION: ........................................................................................19-4
20. BLUETOOTH INSTALLATION & OPERATION ................................................................................20-1
20.1. PREREQUISITES ...................................................................................................................................20-1
20.2. INSTALLING THE ADE BLUETOOTH HARDWARE ........................................................................................20-1
20.3. INSTALLING THE BDE BLUETOOTH HARDWARE ....................................................................................... 20-2
20.4. DIAGNOSTIC MODE............................................................................................................................. 20-2
20.5. REMOVING THE ADE BLUETOOTH HARDWARE .........................................................................................20-3
20.6. REMOVING THE BDE BLUETOOTH HARDWARE .........................................................................................20-3
20.7. INSTALLING SOFTWARE VIA BLUETOOTH ................................................................................................ 20-4
20.8. NORMAL OPERATION MODE ................................................................................................................ 20-4
21. 6011-4 TVRO TECHNICAL SPECIFICATIONS ..................................................................................21-1
21.1. STABILIZED ANTENNA PEDESTAL ASSEMBLY ........................................................................................... 21-1
21.2. QORTM DUAL REFLECTOR CONFIGURATION: ...........................................................................................21-2
21.2.1. Antenna Assembly -60” C-Band TVRO...................................................................................21-2
21.2.2. Antenna Assembly -40” Ku-Band TVRO.................................................................................21-2
21.3. INTERCHANGEABLE LNB OPTIONS ......................................................................................................... 21-3
21.3.1. C-Band LNBs ..........................................................................................................................21-3
21.3.2. US Circular LNB ......................................................................................................................21-3
21.3.3. DLA Circular LNB ....................................................................................................................21-3
21.3.4. European Quad Universal Linear LNB ......................................................................................21-3
21.4. MK 2PEDESTAL CONTROL UNIT (PCU) .................................................................................................21-4
21.5. MK 2MOTOR DRIVER ENCLOSURE (MDE)..............................................................................................21-4
21.6. 400 MHZ BASE &PEDESTAL UNLIMITED AZIMUTH MODEMS (3 CHANNEL) ..................................................21-5
21.7. RADOME ASSEMBLY,76”......................................................................................................................21-5
21.8. ADE PEDESTAL POWER REQUIREMENTS: ................................................................................................21-6

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21.9. ENVIRONMENTAL SPECIFICATIONS......................................................................................................... 21-6
21.9.1. Climatic Conditions................................................................................................................. 21-6
21.9.2. Chemically Active Substances ................................................................................................. 21-6
21.9.3. Transit Conditions .................................................................................................................. 21-6
21.10. BELOW DECKS EQUIPMENT ...................................................................................................................21-7
21.10.1. Antenna Control Unit (ACU).....................................................................................................21-7
21.10.2. Terminal Mounting Strip (TMS) ................................................................................................21-7
21.10.3. Satellite Receiver.....................................................................................................................21-7
21.10.4. Multiswitch .............................................................................................................................21-7
21.11. CABLES ..............................................................................................................................................21-7
21.11.1. Antenna Control Cable (Provided from ACU to the Base MUX) ..................................................21-7
21.11.2. Antenna L-Band TVRO IF Coax Cables (Customer Furnished) ....................................................21-7
21.11.3. Multi-conductor Cables (Customer Furnished).......................................................................... 21-8
22. DRAWINGS ................................................................................................................................ 22-1
22.1. 6011-4 MODEL SPECIFIC DRAWINGS ..................................................................................................... 22-1

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Safety Sea Tel 6011-4
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1. Safety
The following general safety precautions must be observed during all phases of operation, service and repair of this
equipment. Failure to comply with these precautions or with specific warnings elsewhere in this manual violates safety
standards of design, manufacture and intended use of the equipment. Sea Tel Inc (dba Cobham SATCOM) assumes no
liability for the customer's failure to comply with these requirements.
Service
User access to the interior of the antenna control unit (ACU) is prohibited.
Access to the interior of the Above Decks Equipment (ADE), is allowed for inspection of components as
described in the Scheduled Inspections section of this manual may be accomplished by a technician/engineer.
Maintenance of the ADE should only be performed by technicians/engineers who are authorized by Cobham
SATCOM. Only authorized Partners who have received factory training on this equipment will be able to file a
claim for warranty reimbursement. Failure to comply with standard practices, which include but are not limited
to modification of the terminal away from factory documented assemblies may also void the warranty period.
Do not service or adjust alone
Do not attempt internal service or adjustments unless another person, capable of rendering first aid resuscitation,
is present.
Grounding, cables and connections
To minimize shock hazard and to protect against lightning, the equipment chassis and cabinet must be
connected to an electrical ground. The Above & Below Decks Equipments must be grounded to the ship. For
further grounding information refer to the Installation chapter of this manual.
Do not extend the cables beyond the lengths specified for the equipment. The cable between the ACU and
Above Deck Unit can be extended if it complies with the specified data concerning cable losses etc.
All coaxial cables are to be shielded and should not be affected by magnetic fields. However, try to avoid running
cables parallel to high power and AC/RF wiring as it might cause malfunction of the equipment.
Power supply
AC Power to the ADE is provided by a separate, breakered, power cable.
Do not operate in an explosive atmosphere
Do not operate the equipment in the presence of flammable gases or fumes. Operation of any electrical
equipment in such an environment constitutes a definite safety hazard.
Keep away from live circuits
Operating personnel must not remove equipment covers. Component replacement and internal adjustment must
be made by qualified maintenance personnel. Do not replace components with the power cable connected.
Under certain conditions, dangerous voltages may exist even with the power cable removed. To avoid injuries,
always disconnect power and discharge circuits before touching them.
Failure to comply with the rules above will void the warranty!

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6011-4 System Configuration(s) Sea Tel 6011-4
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2. 6011-4 System Configuration(s)
The 6011-4 Stabilized Antenna system is used for TeleVision Receive Only (TVRO) satellite communications. It is
comprised of two major groups of equipment: the Above Decks Equipment (ADE) and the Below Decks Equipment
(BDE). There is also interconnecting cables between the ADE and BDE and cables to provide other inputs to the
system.
2.1. System Cables
AC power and coaxial cables are discussed in other chapters and their specifications are in the specifications
chapter.
2.2. Other Inputs to the System
Multi-conductor cables from Ship’s Gyro Compass and computer may also be connected in the system.
2.3. Simplified Block Diagram of a 6011-4 System
This TVRO 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.
The design of the 6011 is based on Sea Tel’s QOR (Quadrature Oriented Reflectors), which incorporates two
high efficiency back fire circular/linear orthogonal antenna systems utilizing a common suite of electronics on
the same stabilized pedestal. Either of the reflectors can be remotely selected from the Antenna Control
Unit.
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.
A. Above-Decks Equipment (all shown as the ADE) Group
•Stabilized antenna pedestal
•C-Band Antenna (Reflector A) with circular feed and LHCP and RHCP LNBs.
•Ku-Band Antenna (Reflector B) with linear feed and Quad Universal Linear LNB.
•Radome Assembly
B. Below-Decks Equipment Group
•Antenna Control Unit
•Terminal Mounting Strip Assembly.
•Base Modem Panel
•Customer Furnished Equipment - Multi-switch, Satellite Receiver(s), Television(s) and other below
decks equipment required for the desired TVRO system.
•Appropriate Coaxial and multi-conductor cables.

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Site Survey - Shipboard Sea Tel 6011-4
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3. Site Survey - Shipboard
There are three objective of the site survey. The first is to find the best place to mount the antenna and the BDE. The
second is to identify the length and routing of the cables and any other items or materials that are required to install
the system. The third is to identify any other issues that must be resolved before or during the installation.
3.1. Site Selection Aboard The Ship
The radome assembly should be installed at a location aboard ship where:
•The antenna has a clear line-of-sight to view as much of the sky (horizon to zenith at all bearings) as is
practical.
•X-Band (3cm) Navigational Radars:
•The ADE should be mounted more than 0.6 meters/2 feet from 2kW (24 km) radars
•The ADE should be mounted more than 2 meters/8 feet from 10kW (72 km) radars
•The ADE should be mounted more than 4 meters/12 feet from 160kW (250km) radars
•S-Band (10cm) Navigational Radars:
•If the ADE is/has C-Band it should be mounted more than 4 meters/12 feet from the S-band
Radar.
•The ADE should not be mounted on the same plane as the ship's radar, so that it is not directly in the
radar beam path.
•The ADE should be mounted more than 2.5 meters/8 feet from any high power MF/HF antennas (<400W).
•The ADE should be mounted more than 4 meters/12 feet from any high power MF/HF antennas (1000W).
•The ADE should also be mounted more than 4 meters/12 feet from any short range (VHF/UHF) antennae.
•The ADE should be mounted more than 2.5 meters/8 feet away from any L-band satellite antenna.
•The ADE should be mounted more than 3 meters/10 feet away from any magnetic compass installations.
•The ADE should be mounted more than 2.5 meters/8 feet away from any GPS receiver antennae.
•Another consideration for any satellite antenna mounting is multi-path signals (reflection of the satellite
signal off of nearby surfaces arriving out of phase with the direct signal from the satellite) to the antenna.
This is particularly a problem for the onboard GPS, and/or the GPS based satellite compass.
•The ADE and the BDE should be positioned as close to one another as possible. This is necessary to
reduce the losses associated with long cable runs.
•This mounting platform must also be robust enough to withstand the forces exerted by full rated wind
load on the radome.
•The mounting location is robust enough that it will not flex or sway in ships motion and be sufficiently
well re-enforced to prevent flex and vibration forces from being exerted on the antenna and radome.
•If the radome is to be mounted on a raised pedestal, it MUST have adequate size, wall thickness and
gussets to prevent flexing or swaying in ships motion. In simple terms it must be robust.
If these conditions cannot be entirely satisfied, the site selection will inevitably be a “best” compromise
between the various considerations.
3.2. Antenna Shadowing (Blockage) and RF Interference
At the transmission frequencies of this satellite antenna system, any substantial structures in the way of the
beam path will cause significant degradation of the signal. Care should be taken to locate the ADE so that it
has direct line-of-sight with the satellite without any structures in the beam path through the full 360 degree
ships turn. Wire rope stays, lifelines, small diameter handrails and other accessories may pass through the
beam path in limited numbers; however, even these relatively insignificant shadows can produce measurable
signal loss at these frequencies.

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3.3. Mounting Foundation
3.3.1. Mounting on Deck or Deckhouse
While mounting the ADE on a mast is a common solution to elevate the ADE far enough above the
various obstructions which create signal blockages, sometimes the best mounting position is on a
deck or deckhouse top. These installations are inherently stiffer than a mast installation, if for no
other reason than the design of the deck/deckhouse structure is prescribed by the ship’s classification
society. In the deck/deckhouse design rules, the minimum plating and stiffener guidelines are
chosen to preclude high local vibration amplitudes.
Most installations onto a deck or deckhouse structure will require a mounting pedestal to raise the
ADE above the deck for radome hatch access and to allow the full range of elevation (see ADE
mounting considerations above). Some care must be taken to ensure the mounting pedestal is
properly aligned with the stiffeners under the deck plating.
3.3.2. ADE Mounting Considerations
Mounting the radome directly on the deck or platform prevents access to the hatch in the base of the
radome unless an opening is designed into the mounting
surface. If there is no access to the hatch, the only way to
service the antenna is to remove the radome top. Two people
are required to take the top off of the radome without cracking
or losing control of it, but even with two people a gust of wind
may cause them to lose control and the radome top may be
catastrophically damaged (see repair information in the
radome specifications).
If access to the hatch cannot be provided in the mounting
surface, provide a short ADE support pedestal to mount the
ADE on which is tall enough to allow access into the radome via
the hatch.
Ladder rungs must be provided on all mounting stanchions
greater than 3-4 feet tall to allow footing for personnel safety
when entering the hatch of the radome.
The recommended cable passage in the 50, 60 and 66 inch radomes is through the bottom center of
the radome base, down through the ADE support pedestal, through the deck and into the interior of
the ship.
3.3.3. Sizing of the support pedestal
The following should be taken into account when choosing the height of a mounting support stand:
1. The height of the pedestal should be kept as short as possible, taking into account
recommendations given in other Sea Tel Guidelines.
2. The minimum height of the pedestal above a flat deck or platform to allow access into the
radome for maintenance should be 0.6 meters (24 inches).
3. The connection of the ADE mounting plate to the stanchion and the connection of the
pedestal to the ship should be properly braced with triangular gussets (see graphic above).
Care should be taken to align the pedestal gussets to the ship’s stiffeners as much as
possible. Doublers or other reinforcing plates should be considered to distribute the forces
when under-deck stiffeners are inadequate.
4. The diameter of the pedestal stanchion shall not be smaller than 100 millimeters (4 inches).
Where the ADE base diameter exceeds 1.5 meters (60 inches), additional stanchions
(quantity greater than 3) should be placed rather than a single large stanchion.
5. Shear and bending should be taken into account in sizing the ADE mounting plate and
associated gussets.
6. Shear and bending must be taken into account when sizing the pedestal to ship connection.
7. All welding should be full penetration welds –V-groove welds with additional fillet welds –

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with throats equivalent to the thickness of the thinnest base material.
8. For an ADE mounted greater than 0.6 meters (24 inches) above the ship’s structure, at least
one (1) foot rung should be added. Additional rungs should be added for every 0.3 meter (12
inches) of pedestal height above the ship’s structure.
9. For an ADE mounted greater than 3 meters (9 feet) above the ship’s structure, a fully
enclosing cage should be included in way of the access ladder, starting 2.3 meters (7 feet)
above the ship’s structure.
3.4. Mounting Height
The higher up you mount the antenna above the pivot point of the ship the higher the tangential acceleration
(g-force) exerted on the antenna will be (see chart below).
When the g-force exerted on the antenna is low, antenna stabilization and overall performance are not
affected.
If the g-force exerted on the antenna is high enough (> 1 G), antenna stabilization and overall performance are
affected.
If the g-force exerted on the antenna is excessive (1-2 Gs), the antenna does not maintain stabilization and
may be physically damaged by the g-force.
3.5. Mast Configurations
Sea Tel recommends mounting the ADE in a location that has both a clear line-of-sight to the target satellites
in all potential azimuth/elevation ranges and sufficient support against vibration excitement. If possible,
mounting the ADE pedestal directly to ship deckhouse structures or other box stiffened structures is
preferred. However, in many cases, this imposes limits on the antenna system’s clear line-of-sight.
Often the solution for providing the full azimuth/elevation range the antenna needs is to mount the ADE on
the ship’s mast. Unfortunately, masts do not consider equipment masses in design and often have harmonic
frequencies of their own.
There are many designs of masts used on ships – masts are nearly as unique in design as the ship is – but the
designs often fall into a few categories. These categories can be addressed in terms of typical responses and
problems with regards to vibration and mounting of ADE. The most common categories of masts are:
3.5.1. Vertical Masts
Vertical masts are a very ancient and common mast
design. In essence, it is the mast derived from the

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sailing mast and adapted for mounting the ever-increasing array of antennae which ships need to
communicate with the world. This drawing of a vertical mast shows the preferred mounting of the
ADE center-line above the plane of the radar. Alternatively the ADE is mounted below the plane of
the radar signal
Vertical masts are most commonly found on cargo ships – they are simple, inelegant and functional.
They are also fairly stiff against torsional reaction and lateral vibrations, as long as the ADE is
mounted on a stiff pedestal near the vertical centerline of the mast. If centerline mounting is
impractical or otherwise prohibited, the mast platform the ADE is mounted on should be checked for
torsional vibration about the centerline of the mast and the orthogonal centerline of the platform.
If the estimated natural frequency of the mast or platform is less than 35 Hertz, the mast or platform
should be stiffened by the addition of deeper gussets under the platform or behind the mast.
3.5.2. Raked Masts
Raked masts are found on vessels where the style or appearance of the entire vessel is important.
Again, the inclined mast is a direct descendant from
the masts of sailing ships – as ship owners wanted
their vessels to look more unique and less utilitarian,
they ‘raked’ the masts aft to make the vessel appear
capable of speed. This drawing shows a raked mast,
again with the preferred ADE mounting above the
radar and alternate with the ADE below the radar.
Raked masts pose special problems in both
evaluating the mast for stiffness and mounting of
antennae. As can be seen in the drawing, all
antennae must be mounted on platforms or other
horizontal structures in order to maintain the
vertical orientation of the antenna centerline. This
implies a secondary member which has a different natural frequency than the raked mast’s natural
frequency. In order to reduce the mass of these platforms, they tend to be less stiff than the main
box structure of the raked mast. Thus, they will have lower natural frequencies than the raked mast
itself. Unfortunately, the vibratory forces will act through the stiff structure of the raked mast and
excite these lighter platforms, to the detriment of the antenna.

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3.5.3. Girder Masts
Girder masts are large platforms atop a pair of columns. Just like girder constructions in buildings,
they are relatively stiff athwart ship – in their
primary axis – but less stiff longitudinally and
torsionally. An example of a girder mast is shown in
this drawing, with the preferred ADE mounting
outboard and above the radar directly on one of the
columns and alternate with the ADE centered on
the girder above the plane of the radar.
The greatest weakness of girder masts is in torsion –
where the girder beam twists about its vertical
centerline axis. As with all mast designs discussed so far, mounting the antenna in line with the
vertical support structure will reduce the vibration tendencies. Mounting the antenna directly above
the girder columns provides ample support to the antenna pedestal and locates the antenna weight
where it will influence the natural frequency of the mast the least.
3.5.4. Truss Mast
Truss masts are a variant on the girder mast concept. Rather than a pair of columns supporting a
girder beam, the construction is a framework of
tubular members supporting a platform on which the
antennae and other equipment are mounted. A typical
truss mast is shown in this photograph.
Like a girder mast, truss masts are especially stiff in the
athwart ship direction. Unlike a girder mast, the truss
can be made to be nearly as stiff in the longitudinal
direction. Truss masts are particularly difficult to
estimate the natural frequency – since a correct
modeling includes both the truss structure of the
supports and the plate/diaphragm structure of the
platform. In general, the following guidelines apply
when determining the adequate support for mounting
an antenna on a truss mast:
1. Antenna ADE pedestal gussets should align with platform stiffeners which are at least 200
millimeters in depth and 10 millimeters in thickness.
2. When possible, the antenna ADE pedestal column should align with a vertical truss support.
3. For every 100 kilograms of ADE weight over 250 kilograms, the depth of the platform
stiffeners should be increased by 50 millimeters and thickness by 2 millimeters.
Sea Tel does not have a recommended arrangement for a truss mast – the variability of truss mast
designs means that each installation needs to be evaluated separately.
3.6. Safe Access to the ADE
Safe access to the ADE should be provided. Provisions of the ship’s Safety Management System with regard
to men aloft should be reviewed and agreed with all personnel prior to the installation. Installations greater
than 3 meters above the deck (or where the access starts at a deck less than 1 meter in width) without cages
around the access ladder shall be provided with means to latch a safety harness to a fixed horizontal bar or
ring.
The access hatch for the ADE shall be oriented aft, or inboard, when practical. In any case, the orientation of
the ADE access hatch shall comply with the SMS guidelines onboard the ship. Nets and other safety rigging
under the ADE during servicing should be rigged to catch falling tools, components or fasteners.
3.7. Below Decks Equipment Location
The Antenna Control Unit and other equipment that are standard 19” rack mount design should be installed in
one of these racks. Plan to allow access to the rear of the equipment in the rack.

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The Satellite Receiver, router, computers and any other associated equipment should be properly mounted
per their design.
3.8. Cables
During the site survey, walk the path where the cables will be installed. Pay particular attention to how cables
will be installed; such as what obstacles they will be routed around, difficulties that will be encountered and
the overall length of the cables. The ADE should be installed using good electrical practice. Sea Tel
recommends referring to IEC 60092-352 for specific guidance in choosing cables and installing cables onboard
a ship. Within these guidelines, Sea Tel will provide some very general information regarding the electrical
installation.
In general, all cable shall be protected from chaffing and secured to a cableway. Cable runs on open deck or
down a mast shall be in metal conduit suitable for marine use. The conduit shall be blown through with dry air
prior to passing cable to ensure all debris has been cleared out of the conduit and again after passing the cable
to ensure no trapped moisture exists. The ends of the conduit shall be sealed with cable glands (preferred),
mastic or low VOC silicon sealant after the cables have been passed through.
Cables passing through bulkheads or decks shall be routed through approved weather tight glands.
3.8.1. ADE/BDE Coaxial Cables
The first concern with the coaxial cables installed between the ADE & BDE is length. This length is
used to determine the loss of the various possible coax, Heliax or fiber-optic cables that might be
used. You should always provide the lowest loss cables to provide the strongest signal level into the
satellite modem.
Be sure that the shield(s) of the coaxes are not in contact with the ships ground.
The coaxes must be of adequate conductor cross-sectional surface area for the length of the cable
run and that the loop resistance of the cable run is less than 2.0 ohms. Copper clad iron center
conductor cables should never be used.
Signal cable shall be continuous from the connection within the ADE radome, through the structure
of the ship to the BDE. Splices, adapters or dummy connections will degrade the signal level and are
discouraged.
Be careful of sharp bends that kink and damage the cable. Use a proper tubing bender for Heliax
bends.
Penetrations in watertight bulkheads are very expensive, single cable, welded penetrations that must
be pressure tested.
Always use good quality connectors that are designed to fit properly on the cables you are using.
Poor quality connectors have higher loss, can allow noise into the cable, are easily damaged or fail
prematurely.
In as much as is possible, don’t lay the coaxes on power cables. Don’t lay the coaxes on, or directly
beside, the cables from a second Sea Tel antenna, Inmarsat antenna and/or GPS antenna that are
also passing L-band frequencies. Don’t lay the coaxes on, or directly beside, radar cables that may
inject pulse repetition noise –as error bits - into your cables.
3.8.2. Antenna Power Cable
Be cautious of length of the run, for voltage loss issues, and assure that the gauge of the wires is
adequate for the current that is expected to be drawn (plus margin). Antenna power is
recommended (but not required) to be from a UPS, generally the same one that supplies power to
the below decks equipment.
Power cables shall comply with the provisions of IEC 60092-350 and -351 as practical. Power cables
may be routed through the same conduit as the signal cable from the junction box to the base of the
ADE. Power cables shall pass through separate radome penetrations from the signal cable.
The power cable shall be continuous from the UPS (or closest circuit breaker) to the ADE connections
within the radome. The power circuits shall be arranged so that ‘active,’ ‘common’ and ‘neutral’
(ground) legs are all made or broken simultaneously. All circuit legs shall be carried in the same cable
jacket.