SIST ETS 300 333 E1:2006

• Abstract:

  This European Telecommunication Standard (ETS) provides specifications for the standardisation of the characteristics of receive-only Very Small Aperture Terminals (VSATs) operating as part of a satellite network used for the distribution of data. ; 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), 3,625 to 4,200 GHz (Space-Earth);; - in this frequency band circular polarisation is normally used and the system operates through satellites at 3° spacing;; - designed for unattended operation;; - limited to the reception of baseband digital signals;; - equipped with one or several terrestrial output ports;; - 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 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 a minimum interference protection from other radio systems.

• Status: Published
• Publication Date: 31-Jan-2006
• ICS: 33.060.30 - Radio relay and fixed satellite communications systems
• Technical Committee: SS EIT - Technical Board for the electrotechnical, information technology and telecommunications fields
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Feb-2006
• Due Date: 01-Feb-2006
• Completion Date: 01-Feb-2006
• Ref Project: ETSI ETS 300 333 ed.1 (1994-12) - Satellite Earth Stations and Systems (SES); Receive-only Very Small Aperture Terminals (VSATs) used for data distribution operating in the 4 GHz frequency band

SIST ETS 300 333 E1:2006 is a Slovenian standard identical to ETS 300 333 Edition 1. It covers receive-only Very Small Aperture Terminals (VSATs) used for data distribution in the 4 GHz band, and it specifies the characteristics needed to limit interference, support safety, and maintain reception quality for satellite and terrestrial users.

What does SIST ETS 300 333 E1:2006 specify?

SIST ETS 300 333 E1:2006 specifies receive-only VSATs that operate in a satellite network for data distribution. The scope is focused on terminals in the shared C band from 3,625 to 4,200 GHz Space-Earth, with circular polarization normally used and satellites spaced at 3°.

The document covers both the outdoor unit and the indoor unit, including the cable between them. It excludes installation requirements and does not apply to VSAT network hub stations.

The standard is organized into a short main body with clauses on scope, references, definitions, test report, safety, radio frequency, antenna patterns, polarisation, mechanical performance, terrestrial interfaces, and control and monitoring. It also includes one normative annex.

Annex	What it covers
Annex A	Spurious radiation outside the main-beam, including the test procedure

What are the key requirements of SIST ETS 300 333 E1:2006?

SIST ETS 300 333 E1:2006 combines interference limits, safety provisions, antenna performance requirements, and mechanical checks. In practice, it tells manufacturers and test labs what the terminal must withstand, what it may radiate, and how its antenna must behave in use.

Safety and structural integrity

Clause 5.1 requires the outdoor unit to withstand the main loads from its own weight and wind. This matters because the antenna, reflector, and supporting parts must remain secure in outdoor conditions and must not detach at high wind speeds.

Clause 5.2 requires electrical safety in line with IEC 950 and grounding and bonding provisions for lightning protection in line with IEC 81 (Co) 6. For a manufacturer, this means the design must address electric shock risk and provide a practical way to attach bonding conductors.

Clause 5.3 requires a warning notice where sunlight can be focused near the feed and create a burning hazard. In practice, the equipment must either be treated to avoid this condition or marked so users are alerted.

Radio frequency limits

Clause 6.1 limits spurious radiation from the complete VSAT, including the indoor and outdoor units and at least 10 m of connection cable. This is important because unwanted emissions can disturb nearby radio services, so the terminal must be checked as a full system, not as separate parts.

The same clause also sets off-axis spurious Equivalent Isotropically Radiated Power (EIRP) limits in 100 kHz bands. The practical effect is that the terminal must control emissions away from the main beam, not just on the wanted receive path.

Clause 6.2 requires immunity to external fields from 150 kHz to 2 GHz, using field strengths stated in the standard. The terminal must continue to operate as intended when exposed to these fields, so test labs need to verify normal reception under disturbance.

Clause 9 adds immunity from 2 GHz to 3 GHz. Together with clause 6.2, it gives a frequency range for electromagnetic compatibility checks that reaches from low frequencies up to 3 GHz.

Antenna receive pattern and polarisation

Clause 7 sets the receive gain pattern for co-polar and cross-polar performance. It is meant to protect terrestrial services and adjacent satellites by limiting side-lobe pickup, so the antenna must not collect too much unwanted signal outside the main beam.

The same clause also requires a specific alignment capability for antennas intended to minimize off-axis gain toward the geostationary orbit. In practice, the antenna must be markable and adjustable so the operator can align it properly.

Clause 8 requires receive polarisation discrimination. For linear polarisation, the antenna system must provide strong separation between wanted and orthogonal polarisation; for circular polarisation, the axial ratio limit applies for antennas larger than 2.5 m. This matters because poor polarisation separation can reduce signal quality and increase interference.

Mechanical performance

Clause 10.1 requires pointing stability under wind and gust conditions. The installation must not show permanent distortion or require repointing after the specified wind exposure, which is a direct check of mechanical robustness in service.

Clause 10.2 requires antenna pointing accuracy capability better than 0.3° along the geostationary orbit. Clause 10.3 requires linear polarisation angle adjustment over at least 180° and fixed setting accuracy of at least 1°. These requirements matter because the antenna must be set and held precisely enough to avoid interfering with adjacent satellites.

Interfaces and control

Clause 11 points to relevant ETSs for terrestrial interfaces, so this standard does not define the interface details itself. Clause 12 states that no control and monitoring requirement exists, which tells the reader not to look for management features in this document.

What terms does SIST ETS 300 333 E1:2006 define?

• Outdoor unit - the part installed outdoors in line of sight to the satellite, usually including the antenna subsystem, the Low Noise Block (LNB), and the installation equipment subject to the standard.
• Indoor unit - the remaining part of the equipment, generally installed inside buildings, including the connection cable from the outdoor unit.
• Low Noise Block (LNB) - a device that amplifies the received Radio Frequency (RF) signal with very low internal noise and converts it to intermediate frequencies.
• Very Small Aperture Terminal (VSAT) - the receive-only satellite terminal covered by the standard for data distribution in the 4 GHz band.
• Equipment Under Test (EUT) - the VSAT terminal as assembled for testing, including both units, cabling, and the required power supply cables.
• Equivalent Isotropically Radiated Power (EIRP) - the power concept used in clause 6.1 to limit off-axis spurious emissions.
• Fixed Service (FS) - one of the services sharing the C band mentioned in the scope.
• Fixed Satellite Service (FSS) - the satellite service sharing the same band in the scope.

Who uses SIST ETS 300 333 E1:2006?

SIST ETS 300 333 E1:2006 is used by manufacturers of receive-only VSAT equipment, especially for data distribution systems in the 4 GHz band. It is also used by test laboratories and conformity assessment teams that need a clear way to check radiation, immunity, antenna pattern, and mechanical performance.

Quality managers, procurement teams, and technical buyers can use it to verify that a product fits a receive-only satellite terminal application and that it has the safety and interference-related characteristics expected for outdoor and indoor units. Network engineers and satellite system designers use it to check whether a terminal design is suitable for operation near other terrestrial and satellite users.

What changed in SIST ETS 300 333 E1:2006 from the previous edition?

SIST ETS 300 333 E1:2006 is identified as identical to ETS 300 333 Edition 1. The document history in the standard shows it as the first edition.

Which standards are used with SIST ETS 300 333 E1:2006?

• IEC 950 - provides the electrical safety basis for power voltages, wiring, and connections in clause 5.2.1.
• IEC 81 (Co) 6 - provides lightning protection guidance and the bonding conductor dimensions used in clause 5.2.2.
• CISPR Publication No. 22 - provides the radiated interference limits and measurement method used for lower-frequency spurious radiation in clause 6.1 and Annex A.
• CISPR Publication No. 16 - provides the measurement apparatus and screening performance requirements used in Annex A.
• EN 55011 - provides the measurement method used above 960 MHz in Annex A.
• IEC 510-2-1 - provides the measurement methods used for antenna gain patterns and polarisation discrimination in clauses 7 and 8.
• IEC 801-3 - provides the immunity measurement method used in clauses 6.2 and 9.
• ITU-R Recommendation 732 - provides the method for statistical processing of antenna side-lobe peaks referenced in clause 7.

What does the SIST ETS 300 333 E1:2006 document contain?

The standard contains a test report requirement, safety clauses, radio frequency limits, antenna receive pattern requirements, polarisation discrimination requirements, and mechanical checks. It also includes a detailed normative annex for spurious radiation testing outside the main beam.

Annex A gives a two-stage measurement approach, with an initial frequency-identification step and a second measurement step at a defined test site. It describes the Equipment Under Test setup, the operating-mode signal generation, the physical arrangement of the indoor and outdoor units, and the procedure used below the waveguide cut-off frequency.

Clause 5.1 includes a wind-load verification method with either wind tunnel testing or numerical analysis with simplified tests. The clause also includes a formula for adjusting test velocity when atmospheric conditions differ from standard conditions, which is used to relate the test setup to the specified wind loading.

Clause 7 and clause 8 require antenna gain-pattern and polarisation measurements in defined planes and at specified receive frequencies. These clauses are used for design verification and compliance testing because they show whether the antenna directs energy properly and separates the wanted signal from interference.

SLOVENSKI STANDARD
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Satellite Earth Stations and Systems (SES); Receive-only Very Small Aperture Terminals
(VSATs) used for data distribution operating in the 4 GHz frequency band
Ta slovenski standard je istoveten z: ETS 300 333 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 300 333
TELECOMMUNICATION December 1994
STANDARD
Source: ETSI TC-SES Reference: DE/SES-02005
ICS: 33.060.30
VSAT, Receive
Key words:
Satellite Earth Stations and Systems (SES);
Receive-only Very Small Aperture Terminals (VSATs)
used for data distribution
operating in the 4 GHz frequency band
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 - [e-mail]
X.400: Internet:
Tel.: [phone] - Fax: [phone]
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 300 333: 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 300 333: December 1994
Contents
Foreword .5
1 Scope .7
2 Normative references.8
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
5.3 Solar radiation protection.12
6 Radio Frequency (RF).12
6.1 Spurious radiation.12
6.2 Electromagnetic immunity.13
7 Antenna receive gain pattern (co-polar and cross-polar) .13
8 Receive polarisation discrimination.14
9 Electromagnetic immunity .15
10 Mechanical .15
10.1 Pointing stability .15
10.2 Antenna pointing accuracy capability.15
10.3 Linear polarisation angle alignment capability .16
11 Terrestrial interfaces .16
12 Control and monitoring.16
Annex A (normative): Spurious radiation outside main-beam - test procedure.17
A.1 Introduction.17
A.2 Measuring method.17
A.3 Equipment Under Test (EUT).18
A.4 Operating mode signal generation .18
A.5 Test site and test set-up.18
A.6 Measuring procedure below cut-off frequency .18
History.19

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ETS 300 333: December 1994
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ETS 300 333: 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).
Proposed transposition dates
Date of latest announcement of this ETS (doa): 31st March 1995
Date of latest publication of new National Standard
or endorsement of this ETS (dop/e): 30th September 1995
Date of withdrawal of any conflicting National Standard (dow): 30th September 1995

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ETS 300 333: December 1994
Blank page
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ETS 300 333: December 1994
1 Scope
This European Telecommunication Standard (ETS) provides specifications for the standardisation of the
characteristics of receive-only Very Small Aperture Terminals (VSATs) operating as part of a satellite
network used for the distribution of data.
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), 3,625 to 4,200 GHz (Space-Earth);
- in this frequency band circular polarisation is normally used and the system operates through
satellites at 3° spacing;
- designed for unattended operation;
- limited to the reception of baseband digital signals;
- equipped with one or several terrestrial output ports;
- 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 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 a minimum interference protection from other radio systems.

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ETS 300 333: December 1994
2 Normative references
This ETS incorporates, by dated or undated references, 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 (March 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".
[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 801-3 (1984): "Electromagnetic compatibility for industrial process
measurement and control equipment Part 3".
[8] ITU-R 732 Recommendation (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(s) to be
received, and it is intended to be operated in outdoor environmental conditions.
It usually comprises three main parts:
a) the antenna sub-system which converts the incident radiation field into a guided wave;
b) 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;
c) the installation equipment.
NOTE: 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.
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ETS 300 333: December 1994
3.2 Abbreviations
For the purposes of this ETS, the following abbreviations apply.
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 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.
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.

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ETS 300 333: December 1994
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 10.1):
- results of the measurements of the deviation of the antenna position, and components with
respect to each other.
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,
...