SIST ETS 300 332 E1:2006
(Main)Satellite Earth Stations and Systems (SES); Transmit/receive Very Small Aperture Terminals (VSATs) used for data communications operating in the Fixed Satellite Service (FSS) 6 GHz and 4 GHz frequency bands
- Abstract
This European Telecommunication Standard (ETS) provides specifications for the standardisation of the characteristics of transmit/receive Very Small Aperture Terminals (VSATs) operating as part of a satellite network used for the distribution and/or exchange of data between users. In such a network a Centralised Control and Monitoring Function (CCMF) is responsible for the monitoring and control of remote VSATs.
These VSATs have the following characteristics:
- operating in the shared part of the C band allocated to the Fixed Services (FS) and to the Fixed Satellite Services (FSS), 5,850 to 6,425 GHz (Earth-Space), 3,625 to 4,200 GHz (Space-Earth);
- in these frequency bands circular polarisation is normally used and the system operates through satellites at 3° spacing;
- designed for unattended operation;
- limited to the reception and transmission of baseband digital signals;
- equipped with one, or several terrestrial ports but the total aggregate information bit rate transmitted towards the satellite through these ports shall be limited to 2 048 Mbit/s;
- antenna diameter not exceeding normally 7,3 m, or equivalent corresponding aperture.
The equipment considered in this ETS comprises both the "outdoor unit", usually composed of the antenna subsystem with the associated power amplifier and Low Noise Block (LNB), and the "indoor unit" composed of the remaining part of the communication chain, including the cable between these two units. This ETS does not contain any requirement, recommendation or information about the installation of the VSATs, nor is this ETS intended to apply to VSAT network hub stations.
This ETS deals with two types of specification:
- specifications defined in order to protect other users of the frequency spectrum, both satellite and terrestrial, from unacceptable interference. In addition, these specifications are specified for the purposes of electrical safety, structural safety and solar radiation protection as well as protection from harmful interference;
- specifications related to characteristics which contribute to the quality of reception by providing the VSAT with minimum interference protection from other radio systems.
- Status
- Published
- Publication Date
- 31-Jan-2006
- Current Stage
- 6060 - National Implementation/Publication (Adopted Project)
- Start Date
- 01-Feb-2006
- Due Date
- 01-Feb-2006
- Completion Date
- 01-Feb-2006
SIST ETS 300 332 E1:2006 is the Slovene adoption of ETS 300 332 Edition 1, a European Telecommunications Standard from ETSI for transmit/receive Very Small Aperture Terminals (VSATs) used for data communications in the Fixed Satellite Service (FSS) at 6 GHz and 4 GHz. It specifies the terminal characteristics, limits and test methods used to control interference, safety, mechanical stability and antenna performance. Manufacturers, test laboratories, satellite network operators and purchasers use it to judge whether a VSAT design fits this application.
What does SIST ETS 300 332 E1:2006 specify?
SIST ETS 300 332 E1:2006 specifies characteristics for transmit/receive VSATs that operate in a satellite network for the distribution and/or exchange of data between users. The network model includes a Centralised Control and Monitoring Function (CCMF) that monitors and controls remote VSATs.
The standard is written for terminals in the shared C band - 5,850 to 6,425 GHz for Earth-Space and 3,625 to 4,200 GHz for Space-Earth - using circular polarisation normally and operating through satellites at 3° spacing. It focuses on unattended terminals, baseband digital signals, and systems with one or more terrestrial ports up to a total aggregate information bit rate of 2 048 Mbit/s.
The document covers both the outdoor unit and the indoor unit, including the cable between them. It concentrates on terminal characteristics that protect other users of the spectrum and on characteristics that improve reception quality and interference resistance. Clause 13 points readers to relevant ETSs for terrestrial interfaces, and clause 14 points readers to ETS 300 160 and ETS 300 161 for control and monitoring.
| Annex | What it covers |
|---|---|
| Annex A | Test procedure for spurious radiation outside the main-beam |
What are the key requirements of SIST ETS 300 332 E1:2006?
SIST ETS 300 332 E1:2006 is built around a few practical themes: safe construction, controlled RF emissions, stable antenna pointing, and defined measurement methods. The requirements matter because the terminal must work on a live satellite network without causing interference or becoming unsafe in outdoor use.
Safety and mechanical strength
Clause 5.1 requires the outdoor unit to withstand loads from its own weight and from wind. The structure is checked either by wind-tunnel testing or by numerical analysis followed by simplified tests, and the outdoor unit must remain intact at wind speeds up to 180 km/h. In practice, this means the manufacturer needs structural evidence for the reflector, supports and attachment points.
Clause 5.2 ties electrical safety to IEC 950, lightning bonding to IEC 81 (Co) 6, and requires warning notices for radio frequency radiation and for solar radiation focusing where burn risk may occur. For a buyer or integrator, this means the product must arrive with the necessary safety provisions, markings and bonding points.
RF emission control
Clause 6.1 limits spurious radiation from the full VSAT, including indoor and outdoor units and at least 10 m of interconnecting cable. The limits apply in both carrier-off and carrier-on states, and the manufacturer must declare whether Class A or Class B applies. This matters because the test is on the complete terminal, not only the antenna.
Clause 6.2 limits on-axis spurious radiation outside the nominated bandwidth in the 5,850 to 6,425 GHz band. The manufacturer declares the maximum number of VSATs expected to transmit simultaneously in the same carrier frequency band, called N, and that number appears in the limit. Clause 6.3 adds carrier centre frequency stability so the transmitted carrier and close-in components stay within the nominated bandwidth, including long-term drift over at least one month.
Clause 6.6 also controls suppressed transmission: when the VSAT is told to stop transmitting, its EIRP density must remain low enough for CCMF control to work. In practice, this supports network shutdown and re-enable functions.
Antenna pattern and polarisation performance
Clause 6.4 limits off-axis EIRP emission density within the 5,850 to 6,425 GHz band, separately for co-polar and cross-polar components. The antenna must be measured in four planes around the main beam axis, and the antenna can be aligned to the geostationary orbit plane when it is designed for minimum off-axis gain in that direction.
Clauses 6.5, 10 and 11 set polarisation performance. For transmit use, linear polarisation needs strong discrimination and circular polarisation needs a low axial ratio; for receive use, the same idea protects wanted signals from orthogonal-polarisation interference. The measurements are made at defined frequencies and reported as bi-dimensional gain plots, so alignment and polarisation quality are not left to interpretation.
Clauses 8 and 9 define transmit and receive gain patterns, including side-lobe control. These clauses are important because they protect adjacent satellites and terrestrial services from unwanted radiation and help the wanted signal stay clean.
Pointing and alignment capability
Clause 7.1 requires pointing stability under wind, using the same mechanical verification approach as clause 5.1. Clause 7.2 requires antenna pointing accuracy better than 0.3° along the geostationary orbit, and clause 7.3 requires linear polarisation angle adjustment over at least 180° and fixing with 1° accuracy. In practice, the mount and adjustment mechanism must allow precise installation and re-alignment.
Immunity and network integration
Clause 6.7 requires the VSAT to continue operating under defined electric field strengths up to 2 GHz, and clause 12 extends immunity to 2 GHz to 3 GHz. Clauses 13 and 14 point to other ETSs for terrestrial interfaces and control/monitoring functions. This tells a system designer that the terminal must fit into a wider network architecture, not just meet isolated RF limits.
What terms does SIST ETS 300 332 E1:2006 define?
- Centralised Control and Monitoring Function (CCMF) - the network function that monitors and controls remote VSATs.
- Equivalent Isotropically Radiated Power (EIRP) - the radiated power measure used to express spurious emission and off-axis emission limits.
- Equipment Under Test (EUT) - the VSAT terminal configuration used during Annex A measurements.
- Indoor unit - the part of the terminal generally installed inside the building, including the cable to the outdoor unit.
- LNB - the Low Noise Block in the outdoor unit that amplifies received RF signals and converts them to intermediate frequencies.
- Nominated bandwidth - the manufacturer-declared bandwidth that contains the useful transmission and close-in spectral components.
- Outdoor unit - the part installed in line of sight to the satellite, usually including the antenna subsystem, power amplifier and LNB.
- Spurious radiation - any radiation outside the nominated bandwidth.
Who uses SIST ETS 300 332 E1:2006?
Manufacturers use SIST ETS 300 332 E1:2006 when designing VSAT hardware, especially the outdoor unit, antenna mount, RF chain and control functions. Test laboratories use it to set up emission, immunity, pointing and structural tests.
Satellite network operators and CCMF suppliers use it to check that terminals can be controlled, suppressed and re-enabled in the network. Quality managers and buyers use it to compare products on the same technical basis, especially for interference risk, safety, and antenna performance.
What changed in SIST ETS 300 332 E1:2006 from the previous edition?
SIST ETS 300 332 E1:2006 corresponds to ETS 300 332 Edition 1. The document history identifies the first edition as December 1994.
Which standards are used with SIST ETS 300 332 E1:2006?
- IEC 950 (1991) - provides the electrical safety basis for power voltages, wiring and connections.
- IEC 81 (Co) 6 (1981) - supports lightning protection and bonding conductor provisions.
- CISPR Publication No. 22 (1992) - gives limits and measurement methods for radiated interference below 960 MHz.
- CISPR Publication No. 16 (1987) - supports the measurement apparatus and receiver performance for emission tests.
- EN 55011 (1986) - provides the measurement approach above 960 MHz in Annex A.
- IEC 510-2-1 (1978) - gives antenna measurement methods used for gain patterns and polarisation discrimination.
- IEC 510-1-2 (1984) - gives measurement methods used for spurious radiation at the antenna interface.
- IEC 801-3 (1984) - supports electromagnetic immunity testing.
- ETS 300 160 - covers control and monitoring functions at a VSAT.
- ETS 300 161 - covers centralised control and monitoring functions for VSAT networks.
- ITU-R Recommendation 732 (1992) - supports statistical processing of antenna side-lobe peaks.
What does the SIST ETS 300 332 E1:2006 document contain?
The document contains a test report requirement, safety clauses, RF emission limits, antenna gain-pattern limits, polarisation discrimination requirements, immunity requirements, and references for terrestrial interfaces and control/monitoring. Clause 5 includes two verification routes for mechanical construction, including a wind-tunnel method and a numerical-analysis method, plus a wind-speed correction formula for test conditions.
Annex A gives the practical test procedure for spurious radiation outside the main beam. It defines the EUT, the operating mode signal generation, the test site layout, the two-stage measuring method, and the measurement settings such as bandwidth and angular stepping. The clause set also uses tables and measurement plots to record limits and antenna performance, so the document is used for design verification, compliance testing and technical reporting.
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Frequently Asked Questions
SIST ETS 300 332 E1:2006 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Satellite Earth Stations and Systems (SES); Transmit/receive Very Small Aperture Terminals (VSATs) used for data communications operating in the Fixed Satellite Service (FSS) 6 GHz and 4 GHz frequency bands". This standard covers: This European Telecommunication Standard (ETS) provides specifications for the standardisation of the characteristics of transmit/receive Very Small Aperture Terminals (VSATs) operating as part of a satellite network used for the distribution and/or exchange of data between users. In such a network a Centralised Control and Monitoring Function (CCMF) is responsible for the monitoring and control of remote VSATs. These VSATs have the following characteristics: - operating in the shared part of the C band allocated to the Fixed Services (FS) and to the Fixed Satellite Services (FSS), 5,850 to 6,425 GHz (Earth-Space), 3,625 to 4,200 GHz (Space-Earth); - in these frequency bands circular polarisation is normally used and the system operates through satellites at 3° spacing; - designed for unattended operation; - limited to the reception and transmission of baseband digital signals; - equipped with one, or several terrestrial ports but the total aggregate information bit rate transmitted towards the satellite through these ports shall be limited to 2 048 Mbit/s; - antenna diameter not exceeding normally 7,3 m, or equivalent corresponding aperture. The equipment considered in this ETS comprises both the "outdoor unit", usually composed of the antenna subsystem with the associated power amplifier and Low Noise Block (LNB), and the "indoor unit" composed of the remaining part of the communication chain, including the cable between these two units. This ETS does not contain any requirement, recommendation or information about the installation of the VSATs, nor is this ETS intended to apply to VSAT network hub stations. This ETS deals with two types of specification: - specifications defined in order to protect other users of the frequency spectrum, both satellite and terrestrial, from unacceptable interference. In addition, these specifications are specified for the purposes of electrical safety, structural safety and solar radiation protection as well as protection from harmful interference; - specifications related to characteristics which contribute to the quality of reception by providing the VSAT with minimum interference protection from other radio systems.
This European Telecommunication Standard (ETS) provides specifications for the standardisation of the characteristics of transmit/receive Very Small Aperture Terminals (VSATs) operating as part of a satellite network used for the distribution and/or exchange of data between users. In such a network a Centralised Control and Monitoring Function (CCMF) is responsible for the monitoring and control of remote VSATs. These VSATs have the following characteristics: - operating in the shared part of the C band allocated to the Fixed Services (FS) and to the Fixed Satellite Services (FSS), 5,850 to 6,425 GHz (Earth-Space), 3,625 to 4,200 GHz (Space-Earth); - in these frequency bands circular polarisation is normally used and the system operates through satellites at 3° spacing; - designed for unattended operation; - limited to the reception and transmission of baseband digital signals; - equipped with one, or several terrestrial ports but the total aggregate information bit rate transmitted towards the satellite through these ports shall be limited to 2 048 Mbit/s; - antenna diameter not exceeding normally 7,3 m, or equivalent corresponding aperture. The equipment considered in this ETS comprises both the "outdoor unit", usually composed of the antenna subsystem with the associated power amplifier and Low Noise Block (LNB), and the "indoor unit" composed of the remaining part of the communication chain, including the cable between these two units. This ETS does not contain any requirement, recommendation or information about the installation of the VSATs, nor is this ETS intended to apply to VSAT network hub stations. This ETS deals with two types of specification: - specifications defined in order to protect other users of the frequency spectrum, both satellite and terrestrial, from unacceptable interference. In addition, these specifications are specified for the purposes of electrical safety, structural safety and solar radiation protection as well as protection from harmful interference; - specifications related to characteristics which contribute to the quality of reception by providing the VSAT with minimum interference protection from other radio systems.
SIST ETS 300 332 E1:2006 is classified under the following ICS (International Classification for Standards) categories: 33.060.30 - Radio relay and fixed satellite communications systems. The ICS classification helps identify the subject area and facilitates finding related standards.
SIST ETS 300 332 E1:2006 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
SLOVENSKI STANDARD
01-februar-2006
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Satellite Earth Stations and Systems (SES); Transmit/receive Very Small Aperture
Terminals (VSATs) used for data communications operating in the Fixed Satellite Service
(FSS) 6 GHz and 4 GHz frequency bands
Ta slovenski standard je istoveten z: ETS 300 332 Edition 1
ICS:
33.060.30 Radiorelejni in fiksni satelitski Radio relay and fixed satellite
komunikacijski sistemi communications systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN ETS 300 332
TELECOMMUNICATION December 1994
STANDARD
Source: ETSI TC-SES Reference: DE/SES-02004
ICS: 33.060.30
VSAT, FSS
Key words:
Satellite Earth Stations and Systems (SES);
Transmit/receive Very Small Aperture Terminals (VSATs)
used for data communications
operating in the Fixed Satellite Service (FSS)
6 GHz and 4 GHz frequency bands
ETSI
European Telecommunications Standards Institute
ETSI Secretariat
F-06921 Sophia Antipolis CEDEX - FRANCE
Postal address:
650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE
Office address:
c=fr, a=atlas, p=etsi, s=secretariat - secretariat@etsi.fr
X.400: Internet:
Tel.: +33 92 94 42 00 - Fax: +33 93 65 47 16
Copyright Notification: No part may be reproduced except as authorized by written permission. The copyright and the
foregoing restriction extend to reproduction in all media.
© European Telecommunications Standards Institute 1994. All rights reserved.
New presentation - see History box
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ETS 300 332: December 1994
Whilst every care has been taken in the preparation and publication of this document, errors in content,
typographical or otherwise, may occur. If you have comments concerning its accuracy, please write to
"ETSI Editing and Committee Support Dept." at the address shown on the title page.
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ETS 300 332: December 1994
Contents
Foreword .5
1 Scope .7
2 Normative references.7
3 Definitions and abbreviations .8
3.1 Definitions .8
3.2 Abbreviations .9
4 Test report.9
5 Safety .9
5.1 Mechanical construction .9
5.2 Electrical safety.11
5.2.1 Power voltages.11
5.2.2 Lightning.11
5.2.3 Radio frequency radiation protection.12
5.2.4 Solar radiation protection .12
6 Radio Frequency (RF).12
6.1 Spurious radiation.12
6.2 On axis spurious radiation (outside the nominated bandwidth) .13
6.3 Transmit carrier centre frequency stability.14
6.4 Off-axis EIRP emission density (co-polar and cross-polar) within the band 5,850 to
6,425 GHz.14
6.5 Transmit polarisation discrimination (linear) or axial ratio (circular) .15
6.6 Carrier on-off (inside the nominated bandwidth).16
6.7 Electromagnetic immunity.16
7 Mechanical .16
7.1 Pointing stability .16
7.2 Antenna pointing accuracy capability.17
7.3 Linear polarisation angle alignment capability .17
8 Antenna transmit gain pattern (co-polar and cross-polar).17
9 Antenna receive gain pattern (co-polar and cross-polar) .18
10 Transmit polarisation discrimination.19
11 Receive polarisation discrimination.20
12 Electromagnetic immunity .20
13 Terrestrial interfaces .20
14 Control and monitoring.20
Annex A (normative): Spurious radiation outside main-beam - test procedure.21
A.1 Introduction.21
A.2 Measuring method.21
A.3 Equipment Under Test (EUT).22
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ETS 300 332: December 1994
A.4 Operating mode signal generation. 22
A.5 Test site and test set-up . 22
A.6 Measuring procedure below cut-off frequency . 22
History. 23
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ETS 300 332: December 1994
Foreword
This European Telecommunication Standard (ETS) has been produced by the Satellite Earth Stations and
Systems (SES) Technical Committee of the European Telecommunications Standards Institute (ETSI).
Transposition dates
Date of latest announcement of this ETS (doa): 31st March 1995
Date of latest publication of new National Standard 30th September 1995
or endorsement of this ETS (dop/e):
Date of withdrawal of any conflicting National Standard (dow): 30th September 1995
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ETS 300 332: December 1994
Blank page
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ETS 300 332: December 1994
1 Scope
This European Telecommunication Standard (ETS) provides specifications for the standardisation of the
characteristics of transmit/receive Very Small Aperture Terminals (VSATs) operating as part of a satellite
network used for the distribution and/or exchange of data between users.
In such a network a Centralised Control and Monitoring Function (CCMF) is responsible for the monitoring
and control of remote VSATs.
These VSATs have the following characteristics:
- operating in the shared part of the C band allocated to the Fixed Services (FS) and to the Fixed
Satellite Services (FSS), 5,850 to 6,425 GHz (Earth-Space), 3,625 to 4,200 GHz (Space-Earth);
- in these frequency bands circular polarisation is normally used and the system operates through
satellites at 3° spacing;
- designed for unattended operation;
- limited to the reception and transmission of baseband digital signals;
- equipped with one, or several terrestrial ports but the total aggregate information bit rate transmitted
towards the satellite through these ports shall be limited to 2 048 Mbit/s;
- antenna diameter not exceeding normally 7,3 m, or equivalent corresponding aperture.
The equipment considered in this ETS comprises both the "outdoor unit", usually composed of the
antenna subsystem with the associated power amplifier and Low Noise Block (LNB), and the "indoor unit"
composed of the remaining part of the communication chain, including the cable between these two units.
This ETS does not contain any requirement, recommendation or information about the installation of the
VSATs, nor is this ETS intended to apply to VSAT network hub stations.
This ETS deals with two types of specification:
- specifications defined in order to protect other users of the frequency spectrum, both satellite and
terrestrial, from unacceptable interference. In addition, these specifications are specified for the
purposes of electrical safety, structural safety and solar radiation protection as well as protection
from harmful interference;
- specifications related to characteristics which contribute to the quality of reception by providing the
VSAT with minimum interference protection from other radio systems.
2 Normative references
This ETS incorporates, by dated or undated reference, provisions from other publications. These
normative references are cited at the appropriate places in the text and the publications are listed
hereafter. For dated references, subsequent amendments to or revisions of any of these publications
apply to this ETS only when incorporated in it by amendment or revision. For undated references the latest
edition of the publication referred to applies.
[1] IEC 950 (1991): "Safety of information technology equipment including electrical
business equipment".
[2] IEC 81 (Co) 6 (1981): "Standards for Lightning Protection of Structures".
[3] CISPR Publication No. 22 (1992): "Limits and methods of measurement of radio
interference characteristics of information technology equipment".
[4] CISPR Publication No. 16 (1987): "Specifications for radio interference
measuring apparatus and measurement methods".
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ETS 300 332: December 1994
[5] EN 55011 (1986): "Limits and methods of measurements of radio interference
characteristics of industrial, scientific and medical (ISM) radio-frequency
equipment".
[6] IEC 510-2-1 (1978): "Methods of measurement for radio equipment used in
satellite earth stations Part 2".
[7] IEC 510-1-2 (1984): "Methods of measurement for radio equipment used in
satellite earth station Part 1".
[8] IEC 801-3 (1984): "Electromagnetic compatibility for industrial process
measurement and control equipment Part 3".
[9] ETS 300 160: "Satellite Earth Stations (SES) - Control and monitoring functions
at a VSAT".
[10] ETS 300 161: "Satellite Earth Stations (SES) - Centralised control and
monitoring functions for VSAT networks".
[11] ITU-R Recommendation 732 (1992): "Method for statistical processing of Earth
station antenna side-lobe peaks".
3 Definitions and abbreviations
3.1 Definitions
For the purposes of this ETS, the following definitions apply.
outdoor unit: Is the part of the terminal installed in a position within line of sight to the satellite and it is
intended to be operated in outdoor environmental conditions.
It usually comprises three main parts:
1) the antenna sub-system which converts the incident radiation field into a guided wave and vice
versa;
2) the LNB, which is a device that amplifies, with very low internal noise, the received signals in the
Radio Frequency (RF) band and converts them to intermediate frequencies;
3) the power amplifier which amplifies the low level RF signals for transmission through the antenna
subsystem.
NOTE 1: The installation equipment (means of attachment) is not included in this ETS.
However, the antenna structures and other components directly mounted on the
antenna and forming an integral part of it, are subject to the specifications of this ETS.
indoor unit: Is composed of the remaining part of the equipment. It is generally installed inside the
buildings and is connected to the outdoor unit. The connection cable between the outdoor and indoor unit
belongs to the indoor unit.
nominated bandwidth: The bandwidth of the VSAT radio frequency transmission is nominated by the
manufacturer. The nominated bandwidth is wide enough to encompass all spectral elements of the
transmission which have a density greater than the specified spurious levels, and to take account of the
transmit carrier frequency stability.
NOTE 2: This parameter is to allow flexibility regarding adjacent channel interference levels
which will be taken into account by operational procedures depending on the exact
transponder carrier assignment situation.
spurious radiation: Is any radiation outside the nominated bandwidth.
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ETS 300 332: December 1994
3.2 Abbreviations
For the purposes of this ETS, the following abbreviations apply:
CCMF Centralised Control and Monitoring Functions
CISPR Comité International Spécial des Perturbations Radioélectriques
CSPDN Circuit Switched Public Data Network
EIRP Equivalent Isotropically Radiated Power
EUT Equipment Under Test
FS Fixed Service
FSS Fixed Satellite Service
IEC International Electrotechnical Commission
ITU International Telecommunication Union
ITU-R ITU Radiocommunication Sector
LNB Low Noise Block (low noise amplifier and down converter)
RF Radio Frequency
VSAT Very Small Aperture Terminal
4 Test report
The test report shall contain:
- the value of the nominated bandwidth declared by the manufacturer;
- the results of the tests.
5 Safety
5.1 Mechanical construction
Purpose:
Protection of operating personnel, the public and goods from insecure structures.
Specification:
This specification applies to the outdoor unit only.
The outdoor unit, including mounted and structural components, (but excluding the means of attachment)
shall be designed to support the following main loads due to:
- the weight of the antenna and structural components;
- the wind speed.
Loading due to snow and ice is not considered.
At wind speeds up to 180 km/h, referred to standard atmosphere temperature and pressure (293 K and
1,013 x 10 Pa (1 013 mbar)), none of the components shall be torn away.
Verification:
Two alternative methods are given for verification.
a) Wind tunnel testing.
A wind tunnel shall be used for the purpose of conformance testing. The wind tunnel tests shall be
performed on the outdoor unit, or alternatively on a scale-model of the outdoor unit. The data
obtained for the scale-model shall be computed in order to obtain data for the true antenna size.
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ETS 300 332: December 1994
b) Numerical analysis and simplified tests.
This method shall provide an alternative to the wind tunnel test. The effects of maximum wind load
shall be first computed on the overall outdoor unit using a numerical analysis method, e.g. finite
elements method by computer taking into account the intrinsic properties of the materials. In a
second step, the computed loads shall be applied to the structure.
The purpose of the numerical analysis is twofold:
1) to show compliance with the specification under nominated conditions;
2) to compute equivalent static loads (force and torque) applied to the critical attachment points
of the structure, e.g.:
- reflector - mounting legs fixing point;
- reflector - struts;
- struts - LNB.
Test procedure:
a) Wind tunnel.
The test object shall be mounted in such a way, that wind load can be applied from all horizontal
directions in steps of 45°. The tests shall be carried out with the elevation angle of the antenna at its
minimum and at its maximum in turn. The wind load shall be increased gradually in steps up to 180
km/h, each step lasting approximately one minute.
The tests may be performed at any atmosphere temperature and air pressure. If the atmospheric
conditions differ from standard conditions (temperature = 293°K, air pressure = 1,013 x 10 Pa),
then the test velocity shall be determined according to the formula:
VV××[(1,013 10 ) /P ]×[T / 293]
TS= T T
where: V = wind velocity in test;
T
V = wind velocity in standard conditions;
S
P = air pressure in test, (Pa);
T
T = temperature in test, (K).
T
During the load conditions the test object shall be observed and the distortions recorded.
The test report shall contain:
- description of the test equipment;
- description of the tests performed;
- results of the measurements or calculations on the mechanical loads transmitted from the
outdoor unit to the attachment devices.
For the pointing stability (see subclause 7.1):
- results of the measurements of the deviation of the antenna position, and components with
respect to each other.
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ETS 300 332: December 1994
b) Numerical analysis and tests.
The computations needed to derive the field of forces and torque and the equivalent static stresses
shall be carried out for the same wind directions and elevation as specified in the wind tunnel test
procedure a) above. Only the maximum 180 km/h shall be considered. The air related parameters,
namely the kinematic viscosity used to calculate drags at the rims of the structure shall be
calculated with the standard atmospheric environmental conditions given in a) above. It shall be
verified with the simulated results that break point limits are not exceeded for any self-contained
element. During the practical test the calculated equivalent static loads shall be applied at any
critical fixing point of the assembly.
During the load conditions, the outdoor unit shall be observed, and any distortion recorded.
The test report shall contain:
- the computation method used;
- description of the test equipment;
- description of the tests performed;
- results of the safety margin calculation;
- results of the measurements or calculations on the mechanical loads transmitted from the
outdoor unit to the attachment devices.
For the pointing stability (see subclause 7.1):
- results of the measurements or mechanical distortions.
5.2 Electrical safety
5.2.1 Power voltages
Purpose:
Protection of operating personnel and the public from electric shock.
Specification:
The electrical safety of the equipment shall be in accordance with the introduction and clauses 1 to 3
of IEC 950 [1]. These clauses deal with fundamental design requirements, wiring, connections and supply.
Verification:
Conformance shall be determined according to IEC 950 [1] verification methods.
5.2.2 Lightning
Purpose:
To avoid dangerous potential differences between the outdoor unit and any other conductive structure.
Specification:
Means shall be provided to permit the attachment of bonding conductors of dimension indicated in table 7
of IEC 81 (Co) 6 [2].
Verification:
Conformance shall be determined by inspection.
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ETS 300 332: December 1994
5.2.3 Radio frequency radiation protection
Purpose:
Protection of operating personnel and the public from radio frequency radiation hazards.
Specification:
The equipment shall be fitted with a warning notice in a clearly visible position, indicating the region in
which a radio frequency radiation level in excess of 10 W/m may occur.
Verification:
By visual inspection.
5.2.4 Solar radiation protection
Purpose:
Protection of operating personnel and the public from solar radiation focusing effects.
Specification:
If, in conditions of sunshine, solar radiation is focused near the feed such that burning may occur, the
equipment shall be fitted with a warning notice in a clearly visible position.
Verification:
A statement shall be provided to indicate that the surface of the antenna has been treated to avoid the
situation, or otherwise by visual inspection to confirm the presence of warning notice.
6 Radio Frequency (RF)
6.1 Spurious radiation
Purpose:
To limit the level of interference to terrestrial and satellite radio services.
Specification:
1) The VSAT shall satisfy the limits for radiated interference field strength specified in CISPR
Publication No. 22 [3] over the frequency range from 30 MHz to 960 MHz, at a test distance of 10
m.
Table 1
Frequency range Quasi-peak at 10 m
(MHz)
(dB μμV/m)
Class B Class A
30 to 230 30 40
230 to 960 37 47
The lower limits shall apply at the transition frequency.
The applicable class A or B shall be designated by the manufacturer and indicated in the data sheet
of the test report.
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ETS 300 332: December 1994
2) For the carrier-off case, the off-axis spurious Equivalent Isotropically Radiated Power (EIRP) from
the VSAT, in any 100 kHz band, shall be below the following limits, for all off-axis angles greater
than 7°:
960,0 MHz to 10,7 GHz 48 dBpW;
10,7 GHz to 21,2 GHz 54 dBpW;
21,2 GHz to 40,0 GHz 60 dBpW.
The lower limits shall apply at the transition frequency.
3) For the carrier-on case, the off-axis spurious EIRP from the VSAT, shall be below the following
limits, for all off-axis angles greater than 7°:
49 dBpW in any 100 kHz band in the range 960,0 MHz to 3,4 GHz;
55 dBpW in any 100 kHz band in the range 3,4 GHz to 5,450 GHz;
78 dBpW in any 20 MHz band in the range 5,450 GHz to 6,825 GHz;
55 dBpW in any 100 kHz band in the range 6,825 GHz to 10,7 GHz;
61 dBpW in any 100 kHz band in the range 10,7 GHz to 21,2 GHz;
78 dBpW in any 20 MHz band in the range 10,9 GHz to 13,650 GHz;
67 dBpW in any 100 kHz band in the range 21,2 GHz to 40 GHz.
The lower limits shall apply at the transition frequency.
4) These limits are applicable to the complete VSAT equipment, comprising the indoor and outdoor
units and at least 10 m
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