SIST EN 303 372-1 V1.2.1:2021

SLOVENSKI STANDARD
01-september-2021
Satelitske zemeljske postaje in sistemi (SES) - Oprema za sprejemanje satelitske
radiodifuzije - 1. del: Zunanja enota za sprejem v frekvenčnem pasu od 10,7 GHz
do 12,75 GHz - Harmonizirani standard za dostop do radijskega spektra
Satellite Earth Stations and Systems (SES) - Satellite broadcast reception equipment -
Part 1: Outdoor unit receiving in the 10,7 GHz to 12,75 GHz frequency band -
Harmonised Standard for access to radio spectrum
Ta slovenski standard je istoveten z: ETSI EN 303 372-1 V1.2.1 (2021-06)
ICS:
33.070.40 Satelit Satellite
33.170 Televizijska in radijska Television and radio
difuzija broadcasting
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

HARMONISED EUROPEAN STANDARD
Satellite Earth Stations and Systems (SES);
Satellite broadcast reception equipment;
Part 1: Outdoor unit receiving in the
10,7 GHz to 12,75 GHz frequency band;
Harmonised Standard for access to radio spectrum

2 ETSI EN 303 372-1 V1.2.1 (2021-06)

Reference
REN/SES-00443-1
Keywords
broadcasting, receiver, requirements, satellite

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ETSI
3 ETSI EN 303 372-1 V1.2.1 (2021-06)
Contents
Intellectual Property Rights . 5
Foreword . 5
Modal verbs terminology . 6
Introduction . 6
1 Scope . 8
2 References . 8
2.1 Normative references . 8
2.2 Informative references . 8
3 Definition of terms, symbols and abbreviations . 9
3.1 Terms . 9
3.2 Symbols . 9
3.3 Abbreviations . 9
4 Technical requirements specifications . 10
4.1 Environmental profile . 10
4.2 Equipment capabilities . 10
4.3 Conformance requirements . 10
4.3.1 Unwanted radiation including Local Oscillator (LO) leakage radiated from the antenna . 10
4.3.2 Antenna gain pattern . 11
4.3.3 Pointing accuracy capability . 12
4.3.4 Antenna pointing and efficiency stability under severe environmental conditions . 13
4.3.5 Linear polarization plane alignment capability . 13
4.3.6 Image frequency rejection . 14
4.3.7 Receiver blocking . 14
5 Testing for compliance with technical requirements . 15
5.1 Environmental conditions for testing . 15
6 Test methods . 15
6.1 Pointing accuracy capability. 15
6.2 Receiver blocking . 15
6.3 LNBF cross-polar discrimination . 16
6.3.1 Linear polarization . 16
6.3.2 Circular polarization . 17
6.4 Linear polarization plane alignment error . 18
Annex A (informative): Relationship between the present document and the essential
requirements of Directive 2014/53/EU . 19
Annex B (informative): Interface between ODU and IDU . 21
Annex C (normative): Generic LNBF specification . 22
C.1 Introduction . 22
C.2 Scope . 22
C.3 Technical requirements specifications . 22
C.3.1 Environmental profile . 22
C.3.2 Equipment capabilities . 22
C.3.3 Conformance requirements . 23
C.3.3.1 Unwanted radiation including Local Oscillator (LO) leakage radiated from the antenna . 23
C.3.3.2 Cross-polar discrimination . 23
C.3.3.3 Image frequency rejection . 23
C.3.3.4 Clamp diameter . 23
C.3.3.5 Location of phase centre . 23
C.3.3.6 Taper . 24
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4 ETSI EN 303 372-1 V1.2.1 (2021-06)
C.3.3.7 Receiver blocking . 24
Annex D (normative): Applicability in conjunction with EN 50585:2014 . 25
Annex E (informative): Applicability of parameters given in ETSI EG 203 336 . 26
Annex F (informative): Other ODU features and performance characteristics . 27
Annex G (normative): Partial testing of new LNBF models. 28
G.1 Introduction . 28
G.2 Scope . 28
G.3 Excluded conformance requirements . 28
Annex H (informative): Change history . 29
History . 30

ETSI
5 ETSI EN 303 372-1 V1.2.1 (2021-06)
Intellectual Property Rights
Essential patents
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ETSI in respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the
ETSI Web server (https://ipr.etsi.org/).
Pursuant to the ETSI Directives including the ETSI IPR Policy, no investigation regarding the essentiality of IPRs,
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Foreword
This Harmonised European Standard (EN) has been produced by ETSI Technical Committee Satellite Earth Stations
and Systems (SES).
The present document has been prepared under the Commission's standardisation request C(2015) 5376 final [i.9] to
provide one voluntary means of conforming to the essential requirements of Directive 2014/53/EU on the harmonisation
of the laws of the Member States relating to the making available on the market of radio equipment and repealing
Directive 1999/5/EC [i.1].
Once the present document is cited in the Official Journal of the European Union under that Directive, compliance with
the normative clauses of the present document given in table A.1 confers, within the limits of the scope of the present
document, a presumption of conformity with the corresponding essential requirements of that Directive and associated
EFTA regulations.
The present document is part 1 of a multi-part deliverable covering satellite broadcast reception equipment, as identified
below:
Part 1: "Outdoor unit receiving in the 10,7 GHz to 12,75 GHz frequency band";
Part 2: "Indoor unit".
National transposition dates
Date of adoption of this EN: 21 June 2021
Date of latest announcement of this EN (doa): 30 September 2021
Date of latest publication of new National Standard
or endorsement of this EN (dop/e): 31 March 2022
Date of withdrawal of any conflicting National Standard (dow): 31 March 2023

ETSI
6 ETSI EN 303 372-1 V1.2.1 (2021-06)
Modal verbs terminology
In the present document "shall", "shall not", "should", "should not", "may", "need not", "will", "will not", "can" and
"cannot" are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of
provisions).
"must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.
Introduction
Today, satellite communications is an important means for broadcast distribution of television and radio programs to
homes. Satellites transmit signals that can be received directly by mass deployed consumer electronics equipment. The
present document concerns the performance of this kind of equipment with regard to harmful interference. The
avoidance of receiving or transmitting interfering signals is considered in the present document, whereas reception of
the wanted signals is not considered. Satellite operators or broadcasters may create specifications for the latter purpose.
The present document is intended to cover the provisions of Radio Equipment Directive [i.1] article 3.2, which states
that "Radio equipment shall be so constructed that it both effectively uses and supports the efficient use of radio
spectrum in order to avoid harmful interference". The directive requires that unwanted radio wave emissions of
transmitters are limited in order to avoid harmful interference. It requires that receivers are resilient against harmful
interference from radio waves in shared and adjacent frequency channels. In addition to the present document, other
ENs that specify technical requirements in respect of essential requirements under other parts of article 3 of the Radio
Equipment Directive [i.1] may apply to equipment within the scope of the present document.
The R&TTE Directive [i.3], which is the predecessor of the Radio Equipment Directive [i.1], contains no receiver
requirements. Moreover, broadcast reception equipment is explicitly not covered. The present document becomes
necessary with the adoption of the Radio Equipment Directive.
An overview of satellite broadcast reception equipment is given in the following. Typically, the equipment comprises
an OutDoor Unit (ODU), and InDoor Unit (IDU), an Inter-Facility Link (IFL) between these units, and optionally
multi-switches for connecting multiple IDUs to an ODU. The ODU comprises an antenna and a Low Noise Block
converter (LNB). The frequency down-conversion by the LNB enables transmission on a coaxial cable to the IDU.
A frequency range that contains several modulated carriers is down-converted as one block. The most popular kind of
antenna is a parabolic reflector antenna with offset feed. In that case the feed horn is often integrated with the LNB into
one unit called Low Noise Block converter with Feed (LNBF). The IDU demodulates one of the carriers,
de-multiplexes the retrieved bit stream and decodes digital audio video and audio for display on a TV screen. Common
terms for the IDU are set-top box or satellite receiver. IDUs may contain a hard disk for recording programs. An IDU
may be capable of processing multiple carriers for direct viewing and recording. The IDU functionality may be
integrated into a TV set. Typically, the satellite transmits two electromagnetic waves with orthogonal polarization at the
same time. In case the satellite transmits a large frequency band, it is divided up for frequency conversion with different
local oscillator frequencies. The IDU selects by control signals which polarization and frequency band the ODU
provides on the IFL. An ODU may work with multiple IDUs or IDUs with multiple tuners via separate IFLs. Multi-
switches connected to an ODU allow connecting a large number of IDUs.
Frequency bands are re-used by satellites on different orbital positions of the Geostationary Orbit arc. Discrimination
between signals from wanted and adjacent orbital positions is provided by the directivity of the ODU antenna. The
actually required discrimination depends on the specific scenario of satellite spacing and Equivalent Isotropically
Radiated Power (EIRP), as well as on the robustness of the wanted signals. Moreover, a certain on-axis gain is required
for receiving the wanted signals with the target availability. In general, a larger antenna provides better discrimination
and gain, but on the other hand small antennas are better accepted by users and the public. Requirements on the antenna
are often given by means of the minimum antenna diameter. The meaning of such a requirement is "that the antenna
gain pattern shall be compliant with a reference pattern or mask that includes the nominal antenna diameter as a
parameter". The nominal diameter is a means for specifying and classifying antennas and in an easy way, but the actual
antenna diameter may be different from it, or the antenna might not be circular. The concept of gain pattern definition
with nominal antenna diameter is applied in the present document.
ETSI
7 ETSI EN 303 372-1 V1.2.1 (2021-06)
Besides the concept of ODU, IDU, IFL and optionally multi-switches, new concepts with different allocation of
functionality exist. With channel stacking or SatCR, frequency channels are re-arranged by the ODU or an additional
unit, so that all relevant channels can be carried on a single coaxial cable. IDUs or additional cables are connected by
simple splitters. With Sat>IP, the ODU or an additional device performs demodulation and conversion to video over
Internet Protocol. Common connected devices including tablet computers can be used to watch broadcast television
inside a home network. Another concept applies optical fibre to carry signals between ODU and multi-switches. In
conjunction with these and further concepts, the same requirements on the ODU characteristics exist.
The present document consists of multiple parts that apply to different kinds of equipment units, including ODUs for
specific frequency bands and IDUs.

ETSI
8 ETSI EN 303 372-1 V1.2.1 (2021-06)
1 Scope
The present document applies to ODUs for satellite broadcast reception from geostationary satellites in the frequency
band 10,7 GHz to 12,75 GHz. An ODU receives electromagnetic waves from a satellite. It amplifies the receive signal
at low noise, converts it to a lower frequency band and makes it available to the IDU on an interface.
Part of the IDU functionality may be integrated with the ODU. In that case the present document applies only to the
ODU functionality that is defined above.
The present document contains requirements to demonstrate that radio equipment both effectively uses and supports the
efficient use of radio spectrum in order to avoid harmful interference.
2 References
2.1 Normative references
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the
referenced document (including any amendments) applies.
Referenced documents which are not found to be publicly available in the expected location might be found at
https://docbox.etsi.org/Reference/.
NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
their long term validity.
The following referenced documents are necessary for the application of the present document.
[1] ETSI ETS 300 457 (Edition 1) (11-1995): "Satellite Earth Stations and Systems (SES); Test
methods for Television Receive Only (TVRO) operating in the 11/12 GHz frequency bands".
2.2 Informative references
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the
referenced document (including any amendments) applies.
NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
their long term validity.
The following referenced documents are not necessary for the application of the present document but they assist the
user with regard to a particular subject area.
[i.1] Directive 2014/53/EU of the European Parliament and of the Council of 16 April 2014 on the
harmonisation of the laws of the Member States relating to the making available on the market of
radio equipment and repealing Directive 1999/5/EC.
[i.2] ETSI ETS 300 784: "Satellite Earth Stations and Systems (SES); Television Receive-Only
(TVRO) satellite earth stations operating in the 11/12 GHz frequency bands".
[i.3] Directive 1999/5/EC of the European Parliament and of the Council of 9 March 1999 on radio
equipment and telecommunications terminal equipment and the mutual recognition of their
conformity.
[i.4] ETSI EG 203 336 (V1.2.1): "Guide for the selection of technical parameters for the production of
Harmonised Standards covering article 3.1(b) and article 3.2 of Directive 2014/53/EU".
[i.5] EN 50585:2014: "Communications protocol to transport satellite delivered signals over IP
networks", produced by CENELEC.
ETSI
9 ETSI EN 303 372-1 V1.2.1 (2021-06)
[i.6] Recommendation ITU-R BO.1213: "Reference receiving Earth station antenna pattern for the
broadcasting-satellite service in the 11.7-12.75 GHz band".
[i.7] EN 61319-1:1996: "Interconnections of satellite receiving equipment - Part 1: Europe", produced
by CENELEC.
[i.8] EN 50607:2015: "Satellite signal distribution over a single coaxial cable - second generation",
produced by CENELEC.
[i.9] Commission Implementing Decision C(2015) 5376 final of 4.8.2015 on a standardisation request
to the European Committee for Electrotechnical Standardisation and to the European
Telecommunications Standards Institute as regards radio equipment in support of Directive
2014/53 of the European Parliament and of the Council.
[i.10] EN 61319-1:1996/A11:1999: "Interconnections of satellite receiving equipment - Part 1: Europe",
produced by CENELEC.
[i.11] ETSI EN 303 372-1 (V1.1.1) (08-2016): "Satellite Earth Stations and Systems (SES); Satellite
broadcast reception equipment; Harmonised Standard covering the essential requirements of
article 3.2 of the Directive 2014/53/EU; Part 1: Outdoor unit receiving in the 10,7 GHz to
12,75 GHz frequency band".
3 Definition of terms, symbols and abbreviations
3.1 Terms
For the purposes of the present document, the following terms apply:
LNB input level range: range of LNB input signal level with low end of the range equal to the level of LNB effective
noise power and the high end of the range being the input level that causes 1 dB gain compression
nominal antenna diameter: antenna diameter specified by the manufacturer that is a parameter in performance
characteristics and that allows reference to a certain performance
NOTE: An antenna with circular aperture of diameter equal to the nominal diameter does typically have the
performance specified.
off-axis angle: angle between the antenna boresight axis and the direction of interest
taper: ratio of field strength in the center and at the edge of an antenna aperture expressed in dB
3.2 Symbols
For the purposes of the present document, the following symbols apply:
� nominal antenna diameter
� focal length of the antenna reflector
� wave length
3.3 Abbreviations
For the purposes of the present document, the following abbreviations apply:
DC Direct Current
EIRP Equivalent Isotropically Radiated Power
EUT Equipment Under Test
IDU InDoor Unit
IFL InterFacility Link
IP Internet Protocol
ETSI
10 ETSI EN 303 372-1 V1.2.1 (2021-06)
LNB Low Noise Block down-converter
LNBF Low Noise Block down-converter with Feed
LO Local Oscillator
ODU OutDoor Unit
RF Radio Frequency
SAT>IP SATellite over Internet Protocol
TV TeleVision
4 Technical requirements specifications
4.1 Environmental profile
The technical requirements of the present document apply under the environmental profile for operation of the
equipment, which shall be in accordance with its intended use. The equipment shall comply with all the technical
requirements of the present document at all times when operating within the boundary limits of the operational
environmental profile defined by its intended use.
4.2 Equipment capabilities
The technical requirements of the present document apply under the capabilities of the equipment, which shall be
specified by the manufacturer. The equipment shall comply with all the technical requirements of the present document
at all times when operating within the boundary limits of the specified equipment capabilities.
Equipment capabilities comprise the following characteristics:
• Receive frequency band
• Polarization states
• Local oscillator frequency
• Nominal antenna diameter �
• Specific satellite network - if applicable
• LNB input level range
An ODU might be capable of receiving multiple frequency bands. The local oscillator frequency and the polarization
states may be different in each frequency band. The specification shall include all combinations of frequency band,
polarization states and local oscillator frequency.
Polarization state can take the values horizontal linear, vertical linear, left hand circular and right hand circular. An
ODU may receive multiple states in one frequency band.
If an ODU is designed for use in a specific satellite network only, then certain conformance requirements are not
relevant with regard to harmful interference. Therefore, a conformance requirement in clause 4.3 may include a
statement that the requirement is not applicable to such ODUs. (In the present document this is the case for
clause 4.3.5.)
4.3 Conformance requirements
4.3.1 Unwanted radiation including Local Oscillator (LO) leakage radiated
from the antenna
Purpose:
To limit the unwanted radiation level from the outdoor unit in order to protect adjacent satellites that use different
frequency bands and are located near-by.
ETSI
11 ETSI EN 303 372-1 V1.2.1 (2021-06)
The power of the unwanted radiation, including the LO frequency as well as its second harmonic, measured at the
antenna flange (including the polarizer, ortho-mode transducer, band-pass filter, RF waveguides) shall not exceed the
following limits:
• -60 dBm in a 120 kHz bandwidth at the fundamental frequency of the LO
• -50 dBm in a 120 kHz bandwidth at the second harmonic of the LO
• -60 dBm in any other 120 kHz bandwidth
This requirement applies to the frequency range from 2,5 GHz to 25 GHz.
Verification:
The test method specified in clause 6.2 in ETSI ETS 300 457 [1] shall apply.
NOTE 1: If LNB and feed horn of a reflector antenna are integrated, then no antenna flange exists. In that case the
radiated signal may be accessed by a feed horn adapter. The LNB manufacturer should supply the feed
horn adaptor and characterization frequency and gain data. The data supplied should be used to correct
the measurements taken.
NOTE 2: The specified test method in clause 6.2 of ETSI ETS 300 457 [1] includes provisions for the case that the
antenna is an integral part which cannot be detached. In that case the specified test method defines that
the reverberation chamber method of measurement is used.
NOTE 3: Version 1.1.1 of the present document [i.11] contained a requirement "Specification 2: Radiation from the
outdoor unit (EIRP)". The requirement has been deleted because this kind of requirement is in the scope
of harmonised standards covering essential requirements on electromagnetic compatibility.
4.3.2 Antenna gain pattern
Purpose:
To protect the wanted signals from interference from terrestrial services and from other satellites.
Specification:
The relative co-polar and cross-polar off-axis antenna gain shall comply with the following masks.
Variables:
�: off-axis angle of the antenna relative to boresight (degrees)
� (�): Co-polar antenna gain at off-axis angle � relative to co-polar on-axis gain (decibel)
co
� (�): Cross-polar antenna gain at off-axis angle � relative to co-polar on-axis gain (decibel)
cross
Parameters:
�: nominal antenna diameter
�: wavelength expressed in the same unit as the diameter
Co-polar mask:
�
�
��
� ��� ≤−2,5×10 � �� for 0≤ � < �
�� �
�
� �
� � ≤� for � ≤� <�
�� � � �
� �
� � ≤29−25log� −� for � ≤� <�
�� � � �
� ��� ≤−5−� for � ≤� < 70°
�� � �
� ��� ≤−� for 70° ≤ � < 180°
�� �
ETSI
12 ETSI EN 303 372-1 V1.2.1 (2021-06)
Where:
�
� =95
�
�
�
� =8+20log
�
�
� =29−25log� −�
� � �
� ��
�
� =
�
�
� �,����
��/��
� =10
�
NOTE 1: � is the lowest expected on-axis gain. It corresponds to an antenna efficiency of 64 %.
�
Cross-polar mask:
� ��� ≤−19 for 0≤� <0,25 �
����� �
���,���
�
� ��� ≤−19+3� � for 0,25 � ≤� <0,44�
����� � �
�,���
�
� ��� ≤−16 for 0,44 � ≤� <�
����� � �
���
�
� �
� � ≤−16+� � � for � ≤ � < �
����� � �
� ��
� �
� �
� � ≤21−25log� −� for � ≤� < �
����� � � �
� ��� ≤−5−� for � ≤ � <70°
����� � �
� ��� ≤−� for 70° ≤ � <180°
����� �
Where:
� �
� =2 �
�
� �,����
�
�
� = �10,1875
�
�
� =21−25log� −(� − 16)
� �
��/��
� =10
�
�
NOTE 2: Equations are not valid in the unlikely case where > 15 708.
�
NOTE 3: The present document is derived from Recommendation ITU-R BO.1213 [i.6]. The cross-polar mask
takes into account degradation due to LNB cross-polar discrimination and cross talk of 20 dB.
Verification:
The test method specified in clause 6.5.2 of ETSI ETS 300 457 [1] shall apply.
The receive signal level may be measured at the output of the LNB.
NOTE 4: If the antenna feed or the complete antenna is integrated with the LNB, then measuring at the antenna
flange is not possible. Measuring at the LNB output delivers valid results, since relative gain is specified.
4.3.3 Pointing accuracy capability
Purpose:
To enable an accurate pointing of the antenna to the wanted satellite at the installation in order to provide the best
possible reception of the wanted signal and to better avoid interference from signals transmitted on other satellites.
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13 ETSI EN 303 372-1 V1.2.1 (2021-06)
Specification:
The antenna sub-system alignment facilities shall enable the main beam axis to be adjusted and fixed with an accuracy
of 10 % of the antenna main beam minimum half power beam-width.
Verification:
The test method specified in clause 6.1 shall apply.
4.3.4 Antenna pointing and efficiency stability under severe environmental
conditions
Purpose:
Under severe environmental conditions, the pointing of the main lobe of the antenna and the shape of the reflector can
be temporarily modified. Consequently, limits shall be given for the pointing and efficiency decrease of the antenna
system.
Specification:
After application of the maximum wind speed defined by its intended use under clause 4.1, the installation shall not
show any sign of permanent distortion or loss of components and shall not suffer a de-pointing greater than the pointing
accuracy limit, as specified in clause 4.3.3.
Verification:
The test method specified in clause 6.5.6 of ETSI ETS 300 457 [1] shall apply.
NOTE: Although de-pointing limit is linked to clause 4.3, it is not required to test the pointing accuracy capability
after application of wind speed. De-pointing may be obtained visibly by means of an angle metre.
4.3.5 Linear polarization plane alignment capability
Purpose:
To enable reception of signals with different linear polarization an accurate match of the receive antenna polarization
plane to the wanted satellite transmit polarization plane shall be performed (in order to take advantage of the antenna
system polarization isolation so as to protect the wanted signals from interference of signals transmitted on the
orthogonal polarization on an adjacent satellite).
Applicability:
This requirement does not apply in case the ODU is designed for a specific satellite network that makes use of both
polarizations.
NOTE: A satellite network may use only one polarization, whereas the orthogonal polarization can be used by
near-by adjacent satellites. Then polarization alignment is required to minimize adjacent satellite
interference. If both polarizations are used by the satellite network that the antenna receives, then
polarization alignment is a network internal issue.
Specification 1:
The receive polarization plane of the antenna system shall at least be continuously adjustable in a range of 180°.
Specification 2:
It shall be possible to fix the receive polarization plane of the antenna system with an error of less than 1°.
Verification:
Specification 1 shall be verified by inspection. For specification 2 the test method specified in clause 6.4 shall apply.
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14 ETSI EN 303 372-1 V1.2.1 (2021-06)
4.3.6 Image frequency rejection
Purpose:
With a LO frequency lower than the received frequency, the image frequency lies in a spectrum region allocated to
maritime radar and other high-power navigation systems. Protection is necessary against the resulting interference.
Specification:
The LNB shall suppress the image frequencies of the received channel by at least 40 dB.
Verification:
The test method specified in clause 6.1.8 of ETSI ETS 300 457 [1] shall apply.
NOTE 1: If the LNB is integrated with a feed horn, then the input signal may be injected by a feed horn adapter.
The LNB manufacturer should supply the feed horn adaptor and characterization frequency and gain data.
The data supplied should be used to correct the measurements taken.
NOTE 2: If signal injection through free space radiation in an anechoic chamber achieves higher accuracy of
measurement results, this method may be used.
4.3.7 Receiver blocking
Purpose:
To prevent high power signals outside the receive frequency band from blocking the reception of signals inside the
receive frequency band.
Specification:
Receiver blocking is characterized here through gain compression for a signal inside the receive frequency band that is
caused by another signal outside the receive frequency band at high power. The level of the other signal is compared to
the level of a signal inside the receive frequency band that would cause the same gain compression.
Receiver blocking rejection at a particular frequency is defined as the level of a second signal at this frequency that
causes a certain gain compression to a first signal inside the receive frequency band, minus the level of a second signal
at a frequency inside the receive frequency band that causes the same gain compression.
The first signal shall be at the centre frequency of the receive frequency band and have a level in the operational range.
The second signal shall cause a gain compression for the first signal of 1 dB. Then the rejection shall comply with
table 1.
Table 1: Receiver blocking rejection
Frequency Minimum rejection
below 9 GHz 20 dB
9 GHz to 10 GHz 10 dB
14 GHz to 16 GHz 10 dB
Above 16 GHz 20 dB
Verification:
The test method specified in clause 6.2 shall apply.
ETSI
15 ETSI EN 303 372-1 V1.2.1 (2021-06)
5 Testing for compliance with technical requirements
5.1 Environmental conditions for testing
Tests defined in the present document shall be carried out at representative points within the boundary limits of the
operational environmental profile defined by its intended use.
Where technical performance varies subject to environmental conditions, tests shall be carried out under a sufficient
variety of environmental conditions (within the boundary limits of the operational environmental profile defined by its
intended use) to give confidence of compliance for the affected technical requirements.
6 Test methods
6.1 Pointing accuracy capability
a) A rotary table that allows rotating the EUT and reading the applied rotation angle shall be used.
b) The EUT shall be mounted on the rotary table so that the rotation axis and the aperture plane are parallel.
c) The antenna shall be pointed towards a satellite in the same way as a user will do it.
d) The pointing shall be improved by rotating the rotary table. The absolute of the rotation angle applied shall be
noted down.
e) Mounting, pointing and improving shall be performed as above, but with an axis perpendicular to the previous
one.
f) The greater of the two noted down angles is the pointing accuracy capability.
6.2 Receiver blocking
a) The output signals of two signal generators shall be combined with equal weight. The combined signal shall be
coupled to the LNB input.
b) A spectrum analyser shall be connected to the LNB output in a way that allows to supply the LNB with power.
c) � is the center frequency of the receive frequency band.
�
d) The first signal generator frequency shall be set to � .
�
e) The first signal generator level shall be set to the centre of the LNB input level range.
f) The spectrum analyser shall be set for measuring the level of the converted first signal at the LNB output.
g) The second signal generator frequency shall be set to � −20 MHz.
�
h) The second signal generator level shall be adjusted so that the measured level of the converted first signal is
1 dB less than in absence of the second signal.
i) The second signal generator level shall be noted down as reference level.
j) The second signal generator frequency shall be set to the frequency where blocking rejection shall be
determined.
k) The second signal generator level shall be adjusted so that the measured level is 1 dB less than in absence of
the second signal.
l) The rejection at this frequency (see step j)) is equal to the second signal generator level determined in step k)
minus the reference level determined in step i).
ETSI
16 ETSI EN 303 372-1 V1.2.1 (2021-06)
m) Steps j) to l) shall be repeated for frequencies in the ranges of table 1.
NOTE 1: The worst case rejection in a particular frequency range can be determined after step i) by sweeping the
second signal generator frequency over the frequency range and observe the gain compression, then
perform steps j) to l) with the frequency where gain compression is highest.
NOTE 2: If the LNB is integrated with a feed horn, then the coupling in step a) may be done by a feed horn adapter.
The LNB manufacturer should supply the feed horn adaptor and characterization frequency and gain data.
The data supplied should be used to correct the measurements taken.
NOTE 3: Figure 1 illustrates the test set-up.

Figure 1: Test set-up for receiver blocking
6.3 LNBF cross-polar discrimination
6.3.1 Linear polarization
In case the LNBF is intended for receiving linear polarization, the following procedure applies.
a) The following test equipment shall be used:
1) A signal generator that covers the LNBF input frequency range.
2) A feed horn adapter, which enables to bypass the feed horn and couple signals of horizontal and vertical
polarization into the waveguide of the LNB input.
3) A DC injector (also called bias tee) that passes the LNBF o
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