SIST EN 303 447 V1.3.1:2022

ETSI EN 303 447 V1.3.1 (2022-07)






HARMONISED EUROPEAN STANDARD
Short Range Devices (SRD);
Harmonised Standard for access to radio spectrum;
Inductive loop systems for robotic mowers operating
within the frequency range 100 Hz to 148,5 kHz

---------------------- Page: 1 ----------------------
2 ETSI EN 303 447 V1.3.1 (2022-07)

Reference
REN/ERM-TG28-552
Keywords
harmonised standard, inductive, measurement,
radio
ETSI
650 Route des Lucioles
F-06921 Sophia Antipolis Cedex - FRANCE

Tel.: +33 4 92 94 42 00  Fax: +33 4 93 65 47 16

Siret N° 348 623 562 00017 - APE 7112B
Association à but non lucratif enregistrée à la
Sous-Préfecture de Grasse (06) N° w061004871

Important notice
The present document can be downloaded from:
http://www.etsi.org/standards-search
The present document may be made available in electronic versions and/or in print. The content of any electronic and/or
print versions of the present document shall not be modified without the prior written authorization of ETSI. In case of any
existing or perceived difference in contents between such versions and/or in print, the prevailing version of an ETSI
deliverable is the one made publicly available in PDF format at www.etsi.org/deliver.
Users of the present document should be aware that the document may be subject to revision or change of status.
Information on the current status of this and other ETSI documents is available at
https://portal.etsi.org/TB/ETSIDeliverableStatus.aspx
If you find errors in the present document, please send your comment to one of the following services:
https://portal.etsi.org/People/CommiteeSupportStaff.aspx
If you find a security vulnerability in the present document, please report it through our
Coordinated Vulnerability Disclosure Program:
https://www.etsi.org/standards/coordinated-vulnerability-disclosure
Notice of disclaimer & limitation of liability
The information provided in the present deliverable is directed solely to professionals who have the appropriate degree of
experience to understand and interpret its content in accordance with generally accepted engineering or
other professional standard and applicable regulations.
No recommendation as to products and services or vendors is made or should be implied.
In no event shall ETSI be held liable for loss of profits or any other incidental or consequential damages.

Any software contained in this deliverable is provided "AS IS" with no warranties, express or implied, including but not
limited to, the warranties of merchantability, fitness for a particular purpose and non-infringement of intellectual property
rights and ETSI shall not be held liable in any event for any damages whatsoever (including, without limitation, damages
for loss of profits, business interruption, loss of information, or any other pecuniary loss) arising out of or related to the use
of or inability to use the software.
Copyright Notification
No part may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and
microfilm except as authorized by written permission of ETSI.
The content of the PDF version shall not be modified without the written authorization of ETSI.
The copyright and the foregoing restriction extend to reproduction in all media.

© ETSI 2022.
All rights reserved.

ETSI

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3 ETSI EN 303 447 V1.3.1 (2022-07)
Contents
Intellectual Property Rights . 5
Foreword . 5
Modal verbs terminology . 6
Introduction . 6
1 Scope . 7
2 References . 7
2.1 Normative references . 7
2.2 Informative references . 8
3 Definition of terms, symbols and abbreviations . 9
3.1 Terms . 9
3.2 Symbols . 11
3.3 Abbreviations . 11
4 Technical requirements specifications . 11
4.1 Environmental profile . 11
4.2 General . 11
4.2.1 Wanted technical performance criteria . 11
4.2.2 RMI modes . 12
4.2.2.1 General . 12
4.2.2.2 Operational Modes . 12
4.2.2.3 Safe Mode . 12
4.2.3 Presentation of equipment for testing purposes . 12
4.3 Transmitter conformance requirements . 13
4.3.1 Operating Frequency Range (OFR) . 13
4.3.1.1 Applicability. 13
4.3.1.2 Description . 13
4.3.1.3 Limits . 13
4.3.1.4 Conformance . 13
4.3.2 Transmitter H-field requirements . 14
4.3.2.1 Applicability. 14
4.3.2.2 Description . 14
4.3.2.3 Limits . 14
4.3.2.4 Conformance . 14
4.3.3 Transmitter spurious emissions . 14
4.3.3.1 Applicability. 14
4.3.3.2 Description . 14
4.3.3.3 Limits . 15
4.3.3.4 Conformance . 16
4.3.4 Transmitter Out Of Band (OOB) emissions . 16
4.3.4.1 Applicability. 16
4.3.4.2 Description . 16
4.3.4.3 Limits . 16
4.3.4.4 Conformance . 16
4.4 Receiver conformance requirements . 16
4.4.1 Introduction. 16
4.4.2 Receiver Spurious Emissions . 16
4.4.2.1 Applicability. 16
4.4.2.2 Description . 17
4.4.2.3 Limits . 17
4.4.2.4 Conformance . 17
4.4.3 Receiver Baseline Sensitivity . 17
4.4.3.1 Applicability. 17
4.4.3.2 Description . 17
4.4.3.3 Limits . 17
4.4.3.4 Conformance . 17
ETSI

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4 ETSI EN 303 447 V1.3.1 (2022-07)
4.4.4 Receiver Baseline Resilience . 17
4.4.4.1 Applicability. 17
4.4.4.2 Description . 17
4.4.4.3 Limits . 18
4.4.4.4 Conformance . 18
5 Testing for compliance with technical requirements . 18
5.1 Environmental conditions for testing . 18
5.2 General conditions for testing . 18
5.3 Artificial antenna . 18
5.4 Measuring receiver . 19
5 Conformance methods of measurement for transmitters and receivers . 19
6.1 General . 19
6.2 Transmitter conformance methods . 20
6.2.1 OFR . 20
6.2.2 H-field . 21
6.2.3 Transmitter unwanted emissions (spurious and OOB emissions) . 21
6.3 Receiver conformance methods . 22
6.3.1 Receiver spurious emissions . 22
6.3.2 Receiver Baseline Sensitivity . 23
6.3.2.1 General . 23
6.3.2.2 Receiver-Baseline Sensitivity Test . 24
6.3.3 Receiver Baseline Resilience (RBR) . 24
6.3.3.1 General . 24
6.3.3.2 RBR Test 1: to test that the robotic mower can handle a lost signal . 25
6.3.3.3 RBR Test 2: to test that the robotic mower can handle a passage of the boundary wire . 26
Annex A (informative): Relationship between the present document and the essential
requirements of Directive 2014/53/EU . 28
Annex B (normative): Test sites and procedures . 30
B.1 Boundary and dependent guidance loops . 30
B.1.1 Artificial antenna for conducted measurements below 30 MHz . 30
B.1.2 General setup and measurement procedure for the current measurement with artificial antenna . 32
B.1.3 Differential mode measurement . 33
B.1.4 Common mode measurement . 34
B.1.5 The reference test garden. 34
B.1.6 Test setup for verification artificial antenna . 34
B.1.6.1 General . 34
B.1.6.2 For Differential Mode Impedance verification . 35
B.1.6.3 For Common Mode Impedance verification . 35
B.2 Radiated measurements using anechoic chamber or open area test site . 36
B.2.1 General . 36
B.2.2 Radiated emission measurements < 30 MHz . 36
B.2.3 Radiated emission measurements 30 MHz to 1 000 MHz. 37
Annex C (informative): Justification for missing RX-requirements from ETSI EG 203 336 . 38
C.1 Justification for other RX-requirements . 38
Annex D (informative): TX spurious emission limit assessment below 9 kHz . 40
Annex E (informative): Change history . 41
History . 42


ETSI

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5 ETSI EN 303 447 V1.3.1 (2022-07)
Intellectual Property Rights
Essential patents
IPRs essential or potentially essential to normative deliverables may have been declared to ETSI. The declarations
pertaining to these essential IPRs, if any, are publicly available for ETSI members and non-members, and can be
found in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to
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,
including IPR searches, has been carried out by ETSI. No guarantee can be given as to the existence of other IPRs not
referenced in ETSI SR 000 314 (or the updates on the ETSI Web server) which are, or may be, or may become,
essential to the present document.
Trademarks
The present document may include trademarks and/or tradenames which are asserted and/or registered by their owners.
ETSI claims no ownership of these except for any which are indicated as being the property of ETSI, and conveys no
right to use or reproduce any trademark and/or tradename. Mention of those trademarks in the present document does
not constitute an endorsement by ETSI of products, services or organizations associated with those trademarks.
DECT™, PLUGTESTS™, UMTS™ and the ETSI logo are trademarks of ETSI registered for the benefit of its

Members. 3GPP™ and LTE™ are trademarks of ETSI registered for the benefit of its Members and of the 3GPP
Organizational Partners. oneM2M™ logo is a trademark of ETSI registered for the benefit of its Members and of the
®
oneM2M Partners. GSM and the GSM logo are trademarks registered and owned by the GSM Association.
Foreword
This Harmonised European Standard (EN) has been produced by ETSI Technical Committee Electromagnetic
compatibility and Radio spectrum Matters (ERM).
The present document has been prepared under the Commission's standardisation request C(2015) 5376 final [i.6] 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.3].
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.

National transposition dates
Date of adoption of this EN: 27 June 2022
Date of latest announcement of this EN (doa): 30 September 2022
Date of latest publication of new National Standard
or endorsement of this EN (dop/e): 31 March 2023
Date of withdrawal of any conflicting National Standard (dow): 31 March 2024

ETSI

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6 ETSI EN 303 447 V1.3.1 (2022-07)
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
The present document covers Robotic Mowers with Inductive loop systems (RMI) using the frequency range below
148,5 kHz. An RMI system includes:
• RMI docking station: charging stations for the robotic mower and the signal generator/antenna connecting
point for the signals on the integral antenna and boundary wire.
• Robotic Mower: receiving part inside the RMI.
• Boundary Wire: user installed antenna.
The present document is structured as follows:
• Clauses 1, 2 and 3 provide a general description on the types of equipment covered by the present document
and the definition of terms, symbols and abbreviations used.
• Clause 4 provides the technical requirements specifications, limits and conformance relative to transmitter and
receiver.
• Clause 5 specifies the conditions and information for testing of the equipment and interpretation of the
measurement results.
• Clause 6 specifies the required measurement methods.
• Annex A (informative) provides the relationship between the present document and the essential requirements
of Directive 2014/53/EU [i.3].
• Annex B (normative) provides necessary information on used test sites and procedures.
• Annex C (informative) provides the justification for missing RX-requirements from ETSI EG 203 336 [i.5].
• Annex D (informative) provides information on TX spurious emission limit assessment below 9 kHz.
• Annex E (informative) provides information on Change history.

ETSI

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7 ETSI EN 303 447 V1.3.1 (2022-07)
1 Scope
The present document specifies technical characteristics and methods of measurements for Robotic Mowers with
Inductive loop systems (RMI) operating within the frequency range 100 Hz to 148,5 kHz.
The present document covers the following RMI systems:
• RMI1 systems: RMI systems without receive only mode
• RMI2 systems: RMI systems with receive only mode
NOTE 1: In RMI1 systems the robotic mower is not able to restart automatically if the boundary signal comes back
after the loss of the boundary signal (safe mode, see clause 4.2.2.3), while in RMI2 systems the robotic
mower is able to restart automatically after the boundary signal is back. This differentiation has been
introduced to cover receiver spurious emissions for RMI2 systems.
These radio equipment types are capable of operating in all or part of the frequency bands given in table 1.
Table 1: Permitted range of operation
Permitted range of operation
Transmit 100 Hz to 148,5 kHz
Receive 100 Hz to 148,5 kHz
NOTE: It should be noted that the frequency range between 9 kHz and
148,5 kHz is EU wide harmonised for inductive Short Range
Devices according to EC Decision 2017/1483/EU [i.2].

NOTE 2: The relationship between the present document and essential requirements of article 3.2 of Directive
2014/53/EU [i.3] is given in Annex A.
The present document only covers RMI systems with antenna sizes smaller than 1,67 km, see
CEPT/ERC/REC 70-03 [i.1], Annex 9.
NOTE 3: The antenna size is described by the distance between those two points on the antenna that have the
largest distance between them (e.g. for a rectangle shaped antenna the largest diagonal; for a circular
shaped antenna the diameter).
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 EN 300 330 (V2.1.1) (02-2017): "Short Range Devices (SRD); Radio equipment in the
frequency range 9 kHz to 25 MHz and inductive loop systems in the frequency range 9 kHz to
30 MHz; Harmonised Standard covering the essential requirements of article 3.2 of Directive
2014/53/EU".
ETSI

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8 ETSI EN 303 447 V1.3.1 (2022-07)
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] CEPT/ERC/REC 70-03: "Relating to the use of Short Range Devices (SRD)".
[i.2] Commission Implementing Decision (EU) 2017/1483 of 8 August 2017 amending Decision
2006/771/EC on harmonisation of the radio spectrum for use by short-range devices and repealing
Decision 2006/804/EC.
[i.3] 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.4] CEPT/ERC/REC 74-01: "Unwanted emissions in the spurious domain".
[i.5] 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.6] 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/EU of the European Parliament and of the Council.
[i.7] EGMF Robotic Mowers Boundary Wire Standard RLM003-1.1/2016.
[i.8] EN 50636-2-107:2015: "Safety of household and similar appliances - Part 2-107: Particular
requirements for robotic battery powered electrical lawnmowers", produced by CENELEC.
[i.9] Void.
[i.10] ETSI EN 303 454 (V1.1.1): "Short Range Devices (SRD); Metal and object detection sensors in
the frequency range 1 kHz to 148,5 kHz; Harmonised Standard covering the essential requirements
of article 3.2 of Directive 2014/53/EU".
[i.11] Void.
[i.12] Void.
[i.13] EN 55016-1-1:2010 + A1:2010 + A2:2014: "Specification for radio disturbance and immunity
measuring apparatus and methods -Part 1-1: Radio disturbance and immunity measuring apparatus
- Measuring apparatus", produced by CENELEC.
[i.14] ETSI TS 103 567 (V1.1.1): "Requirements on signal interferer handl
...

Final draft ETSI EN 303 447 V1.3.1 (2022-04)






HARMONISED EUROPEAN STANDARD
Short Range Devices (SRD);
Harmonised Standard for access to radio spectrum; Inductive
loop systems for robotic mowers operating within the
frequency range 100 Hz to 148,5 kHz

---------------------- Page: 1 ----------------------
2 Final draft ETSI EN 303 447 V1.3.1 (2022-04)

Reference
REN/ERM-TG28-552
Keywords
harmonised standard, inductive, measurement,
radio
ETSI
650 Route des Lucioles
F-06921 Sophia Antipolis Cedex - FRANCE

Tel.: +33 4 92 94 42 00  Fax: +33 4 93 65 47 16

Siret N° 348 623 562 00017 - APE 7112B
Association à but non lucratif enregistrée à la
Sous-Préfecture de Grasse (06) N° w061004871

Important notice
The present document can be downloaded from:
http://www.etsi.org/standards-search
The present document may be made available in electronic versions and/or in print. The content of any electronic and/or
print versions of the present document shall not be modified without the prior written authorization of ETSI. In case of any
existing or perceived difference in contents between such versions and/or in print, the prevailing version of an ETSI
deliverable is the one made publicly available in PDF format at www.etsi.org/deliver.
Users of the present document should be aware that the document may be subject to revision or change of status.
Information on the current status of this and other ETSI documents is available at
https://portal.etsi.org/TB/ETSIDeliverableStatus.aspx
If you find errors in the present document, please send your comment to one of the following services:
https://portal.etsi.org/People/CommiteeSupportStaff.aspx
If you find a security vulnerability in the present document, please report it through our
Coordinated Vulnerability Disclosure Program:
https://www.etsi.org/standards/coordinated-vulnerability-disclosure
Notice of disclaimer & limitation of liability
The information provided in the present deliverable is directed solely to professionals who have the appropriate degree of
experience to understand and interpret its content in accordance with generally accepted engineering or
other professional standard and applicable regulations.
No recommendation as to products and services or vendors is made or should be implied.
In no event shall ETSI be held liable for loss of profits or any other incidental or consequential damages.

Any software contained in this deliverable is provided "AS IS" with no warranties, express or implied, including but not
limited to, the warranties of merchantability, fitness for a particular purpose and non-infringement of intellectual property
rights and ETSI shall not be held liable in any event for any damages whatsoever (including, without limitation, damages
for loss of profits, business interruption, loss of information, or any other pecuniary loss) arising out of or related to the use
of or inability to use the software.
Copyright Notification
No part may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and
microfilm except as authorized by written permission of ETSI.
The content of the PDF version shall not be modified without the written authorization of ETSI.
The copyright and the foregoing restriction extend to reproduction in all media.

© ETSI 2022.
All rights reserved.

ETSI

---------------------- Page: 2 ----------------------
3 Final draft ETSI EN 303 447 V1.3.1 (2022-04)
Contents
Intellectual Property Rights . 5
Foreword . 5
Modal verbs terminology . 6
Introduction . 6
1 Scope . 7
2 References . 7
2.1 Normative references . 7
2.2 Informative references . 8
3 Definition of terms, symbols and abbreviations . 9
3.1 Terms . 9
3.2 Symbols . 11
3.3 Abbreviations . 11
4 Technical requirements specifications . 11
4.1 Environmental profile . 11
4.2 General . 11
4.2.1 Wanted technical performance criteria . 11
4.2.2 RMI modes . 12
4.2.2.1 General . 12
4.2.2.2 Operational Modes . 12
4.2.2.3 Safe Mode . 12
4.2.3 Presentation of equipment for testing purposes . 12
4.3 Transmitter conformance requirements . 12
4.3.1 Operating Frequency Range (OFR) . 12
4.3.1.1 Applicability. 12
4.3.1.2 Description . 13
4.3.1.3 Limits . 13
4.3.1.4 Conformance . 13
4.3.2 Transmitter H-field requirements . 13
4.3.2.1 Applicability. 13
4.3.2.2 Description . 13
4.3.2.3 Limits . 14
4.3.2.4 Conformance . 14
4.3.3 Transmitter spurious emissions . 14
4.3.3.1 Applicability. 14
4.3.3.2 Description . 14
4.3.3.3 Limits . 15
4.3.3.4 Conformance . 15
4.3.4 Transmitter Out Of Band (OOB) emissions . 15
4.3.4.1 Applicability. 15
4.3.4.2 Description . 15
4.3.4.3 Limits . 16
4.3.4.4 Conformance . 16
4.4 Receiver conformance requirements . 16
4.4.1 Introduction. 16
4.4.2 Receiver Spurious Emissions . 16
4.4.2.1 Applicability. 16
4.4.2.2 Description . 16
4.4.2.3 Limits . 16
4.4.2.4 Conformance . 16
4.4.3 Receiver Baseline Sensitivity . 16
4.4.3.1 Applicability. 16
4.4.3.2 Description . 17
4.4.3.3 Limits . 17
4.4.3.4 Conformance . 17
ETSI

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4 Final draft ETSI EN 303 447 V1.3.1 (2022-04)
4.4.4 Receiver Baseline Resilience . 17
4.4.4.1 Applicability. 17
4.4.4.2 Description . 17
4.4.4.3 Limits . 17
4.4.4.4 Conformance . 17
5 Testing for compliance with technical requirements . 18
5.1 Environmental conditions for testing . 18
5.2 General conditions for testing . 18
5.3 Artificial antenna . 18
5.4 Measuring receiver . 18
5 Conformance methods of measurement for transmitters and receivers . 19
6.1 General . 19
6.2 Transmitter conformance methods . 19
6.2.1 OFR . 19
6.2.2 H-field . 20
6.2.3 Transmitter unwanted emissions (spurious and OOB emissions) . 21
6.3 Receiver conformance methods . 21
6.3.1 Receiver spurious emissions . 21
6.3.2 Receiver Baseline Sensitivity . 22
6.3.2.1 General . 22
6.3.2.2 Receiver-Baseline Sensitivity Test . 23
6.3.3 Receiver Baseline Resilience (RBR) . 23
6.3.3.1 General . 23
6.3.3.2 RBR Test 1: to test that the robotic mower can handle a lost signal . 24
6.3.3.3 RBR Test 2: to test that the robotic mower can handle a passage of the boundary wire . 25
Annex A (informative): Relationship between the present document and the essential
requirements of Directive 2014/53/EU . 27
Annex B (normative): Test sites and procedures . 29
B.1 Boundary and dependent guidance loops . 29
B.1.1 Artificial antenna for conducted measurements below 30 MHz . 29
B.1.2 General setup and measurement procedure for the current measurement with artificial antenna . 31
B.1.3 Differential mode measurement . 32
B.1.4 Common mode measurement . 33
B.1.5 The reference test garden. 33
B.1.6 Test setup for verification artificial antenna . 33
B.1.6.1 General . 33
B.1.6.2 For Differential Mode Impedance verification . 34
B.1.6.3 For Common Mode Impedance verification . 34
B.2 Radiated measurements using anechoic chamber or open area test site . 35
B.2.1 General . 35
B.2.2 Radiated emission measurements < 30 MHz . 35
B.2.3 Radiated emission measurements 30 MHz to 1 000 MHz. 36
Annex C (informative): Justification for missing RX-requirements from ETSI EG 203 336 . 37
C.1 Justification for other RX-requirements . 37
Annex D (informative): TX spurious emission limit assessment below 9 kHz . 39
Annex E (informative): Change history . 40
History . 41


ETSI

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5 Final draft ETSI EN 303 447 V1.3.1 (2022-04)
Intellectual Property Rights
Essential patents
IPRs essential or potentially essential to normative deliverables may have been declared to ETSI. The declarations
pertaining to these essential IPRs, if any, are publicly available for ETSI members and non-members, and can be
found in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to
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,
including IPR searches, has been carried out by ETSI. No guarantee can be given as to the existence of other IPRs not
referenced in ETSI SR 000 314 (or the updates on the ETSI Web server) which are, or may be, or may become,
essential to the present document.
Trademarks
The present document may include trademarks and/or tradenames which are asserted and/or registered by their owners.
ETSI claims no ownership of these except for any which are indicated as being the property of ETSI, and conveys no
right to use or reproduce any trademark and/or tradename. Mention of those trademarks in the present document does
not constitute an endorsement by ETSI of products, services or organizations associated with those trademarks.
DECT™, PLUGTESTS™, UMTS™ and the ETSI logo are trademarks of ETSI registered for the benefit of its

Members. 3GPP™ and LTE™ are trademarks of ETSI registered for the benefit of its Members and of the 3GPP
Organizational Partners. oneM2M™ logo is a trademark of ETSI registered for the benefit of its Members and of the
®
oneM2M Partners. GSM and the GSM logo are trademarks registered and owned by the GSM Association.
Foreword
This final draft Harmonised European Standard (EN) has been produced by ETSI Technical Committee
Electromagnetic compatibility and Radio spectrum Matters (ERM), and is now submitted for the Vote phase of the
ETSI standards EN Approval Procedure.
The present document has been prepared under the Commission's standardisation request C(2015) 5376 final [i.6] 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.3].
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.

Proposed national transposition dates
Date of latest announcement of this EN (doa): 3 months after ETSI publication
Date of latest publication of new National Standard
or endorsement of this EN (dop/e): 6 months after doa
Date of withdrawal of any conflicting National Standard (dow): 18 months after doa

ETSI

---------------------- Page: 5 ----------------------
6 Final draft ETSI EN 303 447 V1.3.1 (2022-04)
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
The present document covers Robotic Mowers with Inductive loop systems (RMI) using the frequency range below
148,5 kHz. An RMI system includes:
• RMI docking station: charging stations for the robotic mower and the signal generator/antenna connecting
point for the signals on the integral antenna and boundary wire.
• Robotic Mower: receiving part inside the RMI.
• Boundary Wire: user installed antenna.
The present document is structured as follows:
• Clauses 1, 2 and 3 provide a general description on the types of equipment covered by the present document
and the definition of terms, symbols and abbreviations used.
• Clause 4 provides the technical requirements specifications, limits and conformance relative to transmitter and
receiver.
• Clause 5 specifies the conditions and information for testing of the equipment and interpretation of the
measurement results.
• Clause 6 specifies the required measurement methods.
• Annex A (informative) provides the relationship between the present document and the essential requirements
of Directive 2014/53/EU [i.3].
• Annex B (normative) provides necessary information on used test sites and procedures.
• Annex C (informative) provides the justification for missing RX-requirements from ETSI EG 203 336 [i.5].
• Annex D (informative) provides information on TX spurious emission limit assessment below 9 kHz.
• Annex E (informative) provides information on Change history.

ETSI

---------------------- Page: 6 ----------------------
7 Final draft ETSI EN 303 447 V1.3.1 (2022-04)
1 Scope
The present document specifies technical characteristics and methods of measurements for Robotic Mowers with
Inductive loop systems (RMI) operating within the frequency range 100 Hz to 148,5 kHz.
The present document covers the following RMI systems:
• RMI1 systems: RMI systems without receive only mode
• RMI2 systems: RMI systems with receive only mode
NOTE 1: In RMI1 systems the robotic mower is not able to restart automatically if the boundary signal comes back
after the loss of the boundary signal (safe mode, see clause 4.2.2.3), while in RMI2 systems the robotic
mower is able to restart automatically after the boundary signal is back. This differentiation has been
introduced to cover receiver spurious emissions for RMI2 systems.
These radio equipment types are capable of operating in all or part of the frequency bands given in table 1.
Table 1: Permitted range of operation
Permitted range of operation
Transmit 100 Hz to 148,5 kHz
Receive 100 Hz to 148,5 kHz
NOTE: It should be noted that the frequency range between 9 kHz and
148,5 kHz is EU wide harmonised for inductive Short Range
Devices according to EC Decision 2017/1483/EU [i.2].

NOTE 2: The relationship between the present document and essential requirements of article 3.2 of Directive
2014/53/EU [i.3] is given in Annex A.
The present document only covers RMI systems with antenna sizes smaller than 1,67 km, see
CEPT/ERC/REC 70-03 [i.1], Annex 9.
NOTE 3: The antenna size is described by the distance between those two points on the antenna that have the
largest distance between them (e.g. for a rectangle shaped antenna the largest diagonal; for a circular
shaped antenna the diameter).
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 EN 300 330 (V2.1.1) (02-2017): "Short Range Devices (SRD); Radio equipment in the
frequency range 9 kHz to 25 MHz and inductive loop systems in the frequency range 9 kHz to
30 MHz; Harmonised Standard covering the essential requirements of article 3.2 of Directive
2014/53/EU".
ETSI

---------------------- Page: 7 ----------------------
8 Final draft ETSI EN 303 447 V1.3.1 (2022-04)
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] CEPT/ERC/REC 70-03: "Relating to the use of Short Range Devices (SRD)".
[i.2] Commission Implementing Decision (EU) 2017/1483 of 8 August 2017 amending Decision
2006/771/EC on harmonisation of the radio spectrum for use by short-range devices and repealing
Decision 2006/804/EC.
[i.3] 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.4] CEPT/ERC/REC 74-01: "Unwanted emissions in the spurious domain".
[i.5] 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.6] 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/EU of the European Parliament and of the Council.
[i.7] EGMF Robotic Mowers Boundary Wire Standard RLM003-1.1/2016.
[i.8] EN 50636-2-107:2015: "Safety of household and similar appliances - Part 2-107: Particular
requirements for robotic battery powered electrical lawnmowers", produced by CENELEC.
[i.9] Void.
[i.10] ETSI EN 303 454 (V1.1.1): "Short Range Devices (SRD); Metal and object detection sensors in
the frequency range 1 kHz to 148,5 kHz; Harmonised Standard covering the essential requirements
of article 3.2 of Directive 2014/53/EU".
[i.11] Void.
[i.12] Void.
[i.13] EN 55016-1-1:2010 + A1:2010 + A2:2014: "Specification for radio disturbance and immunity
measuring apparatus and methods
...

Draft ETSI EN 303 447 V1.3.0 (2021-09)






HARMONISED EUROPEAN STANDARD
Short Range Devices (SRD);
Inductive loop systems for robotic mowers;
Harmonised Standard for access to radio spectrum

---------------------- Page: 1 ----------------------
2 Draft ETSI EN 303 447 V1.3.0 (2021-09)

Reference
REN/ERM-TG28-552
Keywords
harmonised standard, inductive, measurement,
radio
ETSI
650 Route des Lucioles
F-06921 Sophia Antipolis Cedex - FRANCE

Tel.: +33 4 92 94 42 00  Fax: +33 4 93 65 47 16

Siret N° 348 623 562 00017 - APE 7112B
Association à but non lucratif enregistrée à la
Sous-Préfecture de Grasse (06) N° w061004871

Important notice
The present document can be downloaded from:
http://www.etsi.org/standards-search
The present document may be made available in electronic versions and/or in print. The content of any electronic and/or
print versions of the present document shall not be modified without the prior written authorization of ETSI. In case of any
existing or perceived difference in contents between such versions and/or in print, the prevailing version of an ETSI
deliverable is the one made publicly available in PDF format at www.etsi.org/deliver.
Users of the present document should be aware that the document may be subject to revision or change of status.
Information on the current status of this and other ETSI documents is available at
https://portal.etsi.org/TB/ETSIDeliverableStatus.aspx
If you find errors in the present document, please send your comment to one of the following services:
https://portal.etsi.org/People/CommiteeSupportStaff.aspx
Notice of disclaimer & limitation of liability
The information provided in the present deliverable is directed solely to professionals who have the appropriate degree of
experience to understand and interpret its content in accordance with generally accepted engineering or
other professional standard and applicable regulations.
No recommendation as to products and services or vendors is made or should be implied.
In no event shall ETSI be held liable for loss of profits or any other incidental or consequential damages.

Any software contained in this deliverable is provided "AS IS" with no warranties, express or implied, including but not
limited to, the warranties of merchantability, fitness for a particular purpose and non-infringement of intellectual property
rights and ETSI shall not be held liable in any event for any damages whatsoever (including, without limitation, damages
for loss of profits, business interruption, loss of information, or any other pecuniary loss) arising out of or related to the use
of or inability to use the software.
Copyright Notification
No part may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and
microfilm except as authorized by written permission of ETSI.
The content of the PDF version shall not be modified without the written authorization of ETSI.
The copyright and the foregoing restriction extend to reproduction in all media.

© ETSI 2021.
All rights reserved.

ETSI

---------------------- Page: 2 ----------------------
3 Draft ETSI EN 303 447 V1.3.0 (2021-09)
Contents
Intellectual Property Rights . 5
Foreword . 5
Modal verbs terminology . 6
Introduction . 6
1 Scope . 7
2 References . 7
2.1 Normative references . 7
2.2 Informative references . 8
3 Definition of terms, symbols and abbreviations . 9
3.1 Terms . 9
3.2 Symbols . 11
3.3 Abbreviations . 11
4 Technical requirements specifications . 11
4.1 Environmental profile . 11
4.2 General . 11
4.2.1 Wanted technical performance criteria . 11
4.2.2 RMI modes . 12
4.2.2.1 General . 12
4.2.2.2 Operational Modes . 12
4.2.2.3 Safe Mode . 12
4.2.3 Presentation of equipment for testing purposes . 12
4.3 Transmitter conformance requirements . 12
4.3.1 Operating Frequency Range (OFR) . 12
4.3.1.1 Applicability. 12
4.3.1.2 Description . 13
4.3.1.3 Limits . 13
4.3.1.4 Conformance . 13
4.3.2 Transmitter H-field requirements . 13
4.3.2.1 Applicability. 13
4.3.2.2 Description . 13
4.3.2.3 Limits . 14
4.3.2.4 Conformance . 14
4.3.3 Transmitter spurious emis sions . 14
4.3.3.1 Applicability. 14
4.3.3.2 Description . 14
4.3.3.3 Limits . 15
4.3.3.4 Conformance . 15
4.3.4 Transmitter Out Of Band (OOB) emissions . 15
4.3.4.1 Applicability. 15
4.3.4.2 Description . 15
4.3.4.3 Limits . 16
4.3.4.4 Conformance . 16
4.4 Receiver conformance requirements . 16
4.4.1 Introduction. 16
4.4.2 Receiver Spurious Emissions . 16
4.4.2.1 Applicability. 16
4.4.2.2 Description . 16
4.4.2.3 Limits . 16
4.4.2.4 Conformance . 16
4.4.3 Receiver Baseline Sensitivity . 16
4.4.3.1 Applicability. 16
4.4.3.2 Description . 17
4.4.3.3 Limits . 17
4.4.3.4 Conformance . 17
ETSI

---------------------- Page: 3 ----------------------
4 Draft ETSI EN 303 447 V1.3.0 (2021-09)
4.4.4 Receiver Baseline Resilience . 17
4.4.4.1 Applicability. 17
4.4.4.2 Description . 17
4.4.4.3 Limits . 17
4.4.4.4 Conformance . 17
5 Testing for compliance with technical requirements . 18
5.1 Environmental conditions for testing . 18
5.2 General conditions for testing . 18
5.3 Artificial antenna . 18
5.4 Measuring receiver . 18
6 Conformance methods of measurement for transmitters and receivers . 19
6.1 General . 19
6.2 Transmitter conformance methods . 19
6.2.1 OFR . 19
6.2.2 H-field . 20
6.2.3 Transmitter unwanted emissions (spurious and OOB emissions) . 21
6.3 Receiver conformance methods . 21
6.3.1 Receiver spurious emissions . 21
6.3.2 Receiver Baseline Sensitivity . 22
6.3.2.1 General . 22
6.3.2.2 Receiver-Baseline Sensitivity Test . 23
6.3.3 Receiver Baseline Resilience . 23
6.3.3.1 General . 23
6.3.3.2 Test 1: to test that the robotic mower can handle a lost signal . 24
6.3.3.3 Test 2: to test that the robotic mower can handle a passage of the boundary wire . 25
Annex A (informative): Relationship between the present document and the essential
requirements of Directive 2014/53/EU . 27
Annex B (normative): Test sites and procedures . 29
B.1 Boundary and dependent guidance loops . 29
B.1.1 Artificial antenna for conducted measurements below 30 MHz . 29
B.1.2 General setup and measurement procedure for the current measurement with artificial antenna . 31
B.1.3 Differential mode measurement . 32
B.1.4 Common mode measurement . 33
B.1.5 The reference test garden. 33
B.1.6 Test setup for verification artificial antenna . 33
B.1.6.1 General . 33
B.1.6.2 For Differential Mode Impedance verification . 34
B.1.6.3 For Common Mode Impedance verification . 34
B.2 Radiated measurements using anechoic chamber or open area test site . 35
B.2.1 General . 35
B.2.2 . Radiated emission measurements < 30
MHz . 36
B.2.3 Radiated emission measurements 30 MHz to 1 000 MHz. 36
Annex C (informative): Justification for missing RX-requirements from ETSI EG 203 336 . 37
C.1 Justification for other RX-requirements . 37
Annex D (informative): TX spurious emission limit assessment below 9 kHz . 39
Annex E (informative): Change history . 40
History . 41


ETSI

---------------------- Page: 4 ----------------------
5 Draft ETSI EN 303 447 V1.3.0 (2021-09)
Intellectual Property Rights
Essential patents
IPRs essential or potentially essential to normative deliverables may have been declared to ETSI. The declarations
pertaining to these essential IPRs, if any, are publicly available for ETSI members and non-members, and can be
found in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to
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,
including IPR searches, has been carried out by ETSI. No guarantee can be given as to the existence of other IPRs not
referenced in ETSI SR 000 314 (or the updates on the ETSI Web server) which are, or may be, or may become,
essential to the present document.
Trademarks
The present document may include trademarks and/or tradenames which are asserted and/or registered by their owners.
ETSI claims no ownership of these except for any which are indicated as being the property of ETSI, and conveys no
right to use or reproduce any trademark and/or tradename. Mention of those trademarks in the present document does
not constitute an endorsement by ETSI of products, services or organizations associated with those trademarks.
DECT™, PLUGTESTS™, UMTS™ and the ETSI logo are trademarks of ETSI registered for the benefit of its

Members. 3GPP™ and LTE™ are trademarks of ETSI registered for the benefit of its Members and of the 3GPP
Organizational Partners. oneM2M™ logo is a trademark of ETSI registered for the benefit of its Members and of the
®
oneM2M Partners. GSM and the GSM logo are trademarks registered and owned by the GSM Association.
Foreword
This draft Harmonised European Standard (EN) has been produced by ETSI Technical Committee Electromagnetic
compatibility and Radio spectrum Matters (ERM), and is now submitted for the combined Public Enquiry and Vote
phase of the ETSI standards EN Approval Procedure.
The present document has been prepared under the Commission's standardisation request C(2015) 5376 final [i.6] 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.3].
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.

Proposed national transposition dates
Date of latest announcement of this EN (doa): 3 months after ETSI publication
Date of latest publication of new National Standard
or endorsement of this EN (dop/e): 6 months after doa
Date of withdrawal of any conflicting National Standard (dow): 18 months after doa

ETSI

---------------------- Page: 5 ----------------------
6 Draft ETSI EN 303 447 V1.3.0 (2021-09)
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
The present document covers Robotic Mowers with Inductive loop systems (RMI) using the frequency range below
148,5 kHz. An RMI system includes:
• RMI docking station: charging stations for the robotic mower and the signal generator/antenna connecting
point for the signals on the integral antenna and boundary wire.
• Robotic Mower: receiving part inside the RMI.
• Boundary Wire: user installed antenna.
The present document is structured as follows:
• Clauses 1, 2 and 3 provide a general description on the types of equipment covered by the present document
and the definitions, symbols and abbreviations used.
• Clause 4 provides the technical requirements specifications, limits and conformance relative to transmitter and
receiver.
• Clause 5 specifies the conditions and information for testing of the equipment and interpretation of the
measurement results.
• Clause 6 specifies the required measurement methods.
• Annex A (informative) provides the relationship between the present document and the essential requirements
of Directive 2014/53/EU [i.3].
• Annex B (normative) provides necessary information on used test sites and procedures.
• Annex C (informative) provides the justification for missing RX-requirements from ETSI EG 203 336 [i.5].
• Annex D (informative) provides information on TX spurious emission limit assessment below 9 kHz.
• Annex E (informative) provides information on Change history.

ETSI

---------------------- Page: 6 ----------------------
7 Draft ETSI EN 303 447 V1.3.0 (2021-09)
1 Scope
The present document specifies technical characteristics and methods of measurements for Robotic Mowers with
Inductive loop systems (RMI) below 148,5 kHz.
The present document covers the following RMI systems:
• RMI1 systems: RMI systems without receive only mode of the robotic mower
• RMI2 systems: RMI systems with receive only mode of the robotic mower
NOTE 1: In RMI1 systems the robotic mower is not able to restart automatically if the boundary signal comes back
after the loss of the boundary signal (safe mode, see clause 4.2.2.3), while in RMI2 systems the robotic
mower is able to restart automatically after the boundary signal is back. This differentiation has been
introduced to cover receiver spurious emisisons for RMI2 systems.
These radio equipment types are capable of operating in all or part of the frequency bands given in table 1.
Table 1: Permitted range of operation
Permitted range of operation
Transmit 100 Hz to 148,5 kHz
Receive 100 Hz to 148,5 kHz
NOTE: It should be noted that the frequency range between 9 kHz and
148,5 kHz is EU wide harmonised for inductive Short Range
Devices according to EC Decision 2017/1483/EU [i.2].

NOTE 2: The relationship between the present document and essential requirements of article 3.2 of Directive
2014/53/EU [i.3] is given in Annex A.
The present document only covers RMI systems with antenna sizes smaller than 1,67 km, see
CEPT/ERC/REC 70-03 [i.1], Annex 9.
NOTE 3: The antenna size is described by the distance between those two points on the antenna that have the
largest distance between them (e.g. for a rectangle shaped antenna the largest diagonal; for a circular
shaped antenna the diameter).
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 EN 300 330 (V2.1.1) (02-2017): "Short Range Devices (SRD); Radio equipment in the
frequency range 9 kHz to 25 MHz and inductive loop systems in the frequency range 9 kHz to
30 MHz; Harmonised Standard covering the essential requirements of article 3.2 of
Directive 2014/53/EU".
ETSI

---------------------- Page: 7 ----------------------
8 Draft ETSI EN 303 447 V1.3.0 (2021-09)
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] CEPT/ERC/REC 70-03: "Relating to the use of Short Range Devices (SRD)".
[i.2] EC Decision 2017/1483/EU: "Commission Implementing Decision (EU) 2017/1483 of
8 August 2017 amending Decision 2006/771/EC on harmonisation of the radio spectrum for use
by short-range devices and repealing Decision 2006/804/EC".
[i.3] 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.4] CEPT/ERC/REC 74-01: "Unwanted emissions in the spurious domain".
[i.5] 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.6] 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/EU of the European Parliament and of the Council.
[i.7] EGMF Robotic Mowers Boundary Wire Standard RLM003-1.1/2016.
[i.8] EN 50636-2-107:2015: "Safety of household and similar appliances - Part 2-107: Particular
requirements for robotic battery powered electrical lawnmowers", produced by CENELEC.
[i.9] Void.
[i.10] ETSI EN 303 454 (V1.1.1): "Short Range Devices (SRD); Metal and object detection sensors in
the frequency range 1 kHz to 148,5 kHz; Harmonised Standard covering the essential requirements
of article 3.2 of Directive 2014/53/EU".
[i.11] Void.
[i.12] Void.
[i.13] EN 55016-1-1:2010 + A1:2010 + A2:2014: "Specification for radio disturbance and immunity
measuring apparatus and methods -Part 1-1: Radio disturbance and immunity measuring apparatus
- Meas
...

Draft ETSI EN 303 447 V1.2.0 (2020-07)






HARMONISED EUROPEAN STANDARD
Short Range Devices (SRD);
Inductive loop systems for robotic mowers;
Harmonised Standard for access to radio spectrum

---------------------- Page: 1 ----------------------
2 Draft ETSI EN 303 447 V1.2.0 (2020-07)



Reference
REN/ERM-TG28-552
Keywords
harmonised standard, inductive, measurement,
radio
ETSI
650 Route des Lucioles
F-06921 Sophia Antipolis Cedex - FRANCE

Tel.: +33 4 92 94 42 00  Fax: +33 4 93 65 47 16

Siret N° 348 623 562 00017 - NAF 742 C
Association à but non lucratif enregistrée à la
Sous-Préfecture de Grasse (06) N° 7803/88

Important notice
The present document can be downloaded from:
http://www.etsi.org/standards-search
The present document may be made available in electronic versions and/or in print. The content of any electronic and/or
print versions of the present document shall not be modified without the prior written authorization of ETSI. In case of any
existing or perceived difference in contents between such versions and/or in print, the prevailing version of an ETSI
deliverable is the one made publicly available in PDF format at www.etsi.org/deliver.
Users of the present document should be aware that the document may be subject to revision or change of status.
Information on the current status of this and other ETSI documents is available at
https://portal.etsi.org/TB/ETSIDeliverableStatus.aspx
If you find errors in the present document, please send your comment to one of the following services:
https://portal.etsi.org/People/CommiteeSupportStaff.aspx
Copyright Notification
No part may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying
and microfilm except as authorized by written permission of ETSI.
The content of the PDF version shall not be modified without the written authorization of ETSI.
The copyright and the foregoing restriction extend to reproduction in all media.

© ETSI 2020.
All rights reserved.

DECT™, PLUGTESTS™, UMTS™ and the ETSI logo are trademarks of ETSI registered for the benefit of its Members.

3GPP™ and LTE™ are trademarks of ETSI registered for the benefit of its Members and
of the 3GPP Organizational Partners.
oneM2M™ logo is a trademark of ETSI registered for the benefit of its Members and
of the oneM2M Partners.
®
GSM and the GSM logo are trademarks registered and owned by the GSM Association.
ETSI

---------------------- Page: 2 ----------------------
3 Draft ETSI EN 303 447 V1.2.0 (2020-07)
Contents
Intellectual Property Rights . 5
Foreword . 5
Modal verbs terminology . 5
Introduction . 6
1 Scope . 7
2 References . 7
2.1 Normative references . 7
2.2 Informative references . 7
3 Definition of terms, symbols and abbreviations . 8
3.1 Terms . 8
3.2 Symbols . 10
3.3 Abbreviations . 10
4 Technical requirements specifications . 11
4.1 Environmental profile . 11
4.2 General . 11
4.2.1 Wanted technical performance criteria . 11
4.2.2 RMI modes . 11
4.2.2.1 General . 11
4.2.2.2 Operational Modes . 11
4.2.2.3 Safe Mode . 12
4.2.3 Presentation of equipment for testing purposes . 12
4.3 Transmitter conformance requirements . 12
4.3.1 Operating Frequency Range (OFR) . 12
4.3.1.1 Applicability. 12
4.3.1.2 Description . 12
4.3.1.3 Limits . 13
4.3.1.4 Conformance . 13
4.3.2 Transmitter H-field requirements . 13
4.3.2.1 Applicability. 13
4.3.2.2 Description . 13
4.3.2.3 Limits . 13
4.3.2.4 Conformance . 13
4.3.3 Transmitter spurious emis sions . 13
4.3.3.1 Applicability. 13
4.3.3.2 Description . 14
4.3.3.3 Limits . 14
4.3.3.4 Conformance . 15
4.3.4 Transmitter Out Of Band (OOB) emissions . 15
4.3.4.1 Applicability. 15
4.3.4.2 Description . 15
4.3.4.3 Limits . 15
4.3.4.4 Conformance . 15
4.4 Receiver conformance requirements . 15
4.4.1 Introduction. 15
4.4.2 Receiver Baseline Sensitivity . 15
4.4.2.1 Applicability. 15
4.4.2.2 Description . 16
4.4.2.3 Limits . 16
4.4.2.4 Conformance . 16
4.4.3 Receiver Baseline Resilience . 16
4.4.3.1 Applicability. 16
4.4.3.2 Description . 16
4.4.3.3 Limits . 16
4.4.3.4 Conformance . 16
ETSI

---------------------- Page: 3 ----------------------
4 Draft ETSI EN 303 447 V1.2.0 (2020-07)
5 Testing for compliance with technical requirements . 17
5.1 Environmental conditions for testing . 17
5.2 General conditions for testing . 17
5.3 Artificial antenna . 17
5.4 Measuring receiver . 17
6 Conformance methods of measurement for transmitters and receivers . 18
6.1 General . 18
6.2 Transmitter conformance methods . 18
6.2.1 OFR . 18
6.2.2 H-field . 19
6.2.3 Transmitter unwanted emissions (spurious and OOB emissions) . 20
6.3 Receiver conformance methods . 20
6.3.1 Receiver spurious emissions . 20
6.3.2 Receiver Baseline Sensitivity . 20
6.3.2.1 General . 20
6.3.2.2 Receiver-Baseline Sensitivity Test . 22
6.3.3 Receiver Baseline Resilience . 22
6.3.3.1 General . 22
6.3.3.2 Test 1: if robotic mower can handle a lost signal . 22
6.3.3.3 Test 2: if robotic mower can handle a passage of the boundary wire . 24
Annex A (informative): Relationship between the present document and the essential
requirements of Directive 2014/53/EU . 26
Annex B (normative): Test sites and procedures . 27
B.1 Boundary and dependent guidance loops . 27
B.1.1 Artificial antenna for conducted measurements below 30 MHz . 27
B.1.2 General setup and measurement procedure for the current measurement with artificial antenna . 29
B.1.3 Differential mode measurement . 30
B.1.4 Common mode measurement . 31
B.1.5 The reference test garden. 31
B.2 Radiated measurements using anechoic chamber or open area test site . 31
Annex C (informative): Justification for missing RX-requirements from ETSI EG 203 336 . 33
C.1 Justification Receiver unwanted emissions . 33
C.2 Justification for other RX-requirements . 33
Annex D (informative): TX spurious emission limit assessment below 9 kHz . 35
Annex E (informative): Change history . 36
History . 37


ETSI

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5 Draft ETSI EN 303 447 V1.2.0 (2020-07)
Intellectual Property Rights
Essential patents
IPRs essential or potentially essential to normative deliverables may have been declared to ETSI. The information
pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found
in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to 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 IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee
can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web
server) which are, or may be, or may become, essential to the present document.
Trademarks
The present document may include trademarks and/or tradenames which are asserted and/or registered by their owners.
ETSI claims no ownership of these except for any which are indicated as being the property of ETSI, and conveys no
right to use or reproduce any trademark and/or tradename. Mention of those trademarks in the present document does
not constitute an endorsement by ETSI of products, services or organizations associated with those trademarks.
Foreword
This draft Harmonised European Standard (EN) has been produced by ETSI Technical Committee Electromagnetic
compatibility and Radio spectrum Matters (ERM), and is now submitted for the combined Public Enquiry and Vote
phase of the ETSI standards EN Approval Procedure.
The present document has been prepared under the Commission's standardisation request C(2015) 5376 final [i.6] 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.3].
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.

Proposed national transposition dates
Date of latest announcement of this EN (doa): 3 months after ETSI publication
Date of latest publication of new National Standard
or endorsement of this EN (dop/e): 6 months after doa
Date of withdrawal of any conflicting National Standard (dow): 18 months after doa

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.
ETSI

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6 Draft ETSI EN 303 447 V1.2.0 (2020-07)
Introduction
The present document covers Robotic Mowers with Inductive loop systems (RMI) using the frequency range below
148,5 kHz. An RMI system includes:
• RMI docking station: charging stations for the robotic mower and the signal generator/antenna connecting
point for the signals on the integral antenna and boundary wire.
• Robotic Mower: receiving part inside the RMI.
• Boundary Wire: user installed antenna.
The present document is structured as follows:
• Clauses 1 through 3 provide a general description on the types of equipment covered by the present document
and the definitions, symbols and abbreviations used.
• Clause 4 provides the technical requirements specifications, limits and conformance relative to transmitter and
receiver.
• Clause 5 specifies the conditions and information for testing of the equipment and interpretation of the
measurement results.
• Clause 6 specifies the required measurement methods.
• Annex A (informative) provides the relationship between the present document and the essential requirements
of Directive 2014/53/EU [i.3].
• Annex B (normative) provides necessary information on used test sites and procedures.
• Annex C (informative) provides the justification for missing RX-requirements from ETSI EG 203 336 [i.5].
• Annex D (informative) provides information on TX spurious emission limit assessment below 9 kHz.
• Annex E (informative) provides information on Change history.

ETSI

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7 Draft ETSI EN 303 447 V1.2.0 (2020-07)
1 Scope
The present document specifies technical characteristics and methods of measurements for Robotic Mowers with
Inductive loop systems (RMI) below 148,5 kHz.
These radio equipment types are capable of operating in all or part of the frequency bands given in table 1.
Table 1: Permitted range of operation
Permitted range of operation
Transmit 100 Hz to 148,5 kHz
Receive 100 Hz to 148,5 kHz
NOTE: It should be noted that the frequency range between 9 kHz and
148,5 kHz is EU wide harmonised for inductive Short Range
Devices according to EC Decision 2017/1483/EU [i.2].

NOTE 1: The relationship between the present document and essential requirements of article 3.2 of Directive
2014/53/EU [i.3] is given in Annex A.
The present document only covers RMI systems with antenna sizes smaller than 1,67 km, see
CEPT/ERC/REC 70-03 [i.1], Annex 9.
NOTE 2: The antenna size is described by the distance between those two points on the antenna that have the
largest distance between them (e.g. for a rectangle shaped antenna the largest diagonal; for a circular
shaped antenna the diameter).
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 EN 300 330 (V2.1.1) (02-2017): "Short Range Devices (SRD); Radio equipment in the
frequency range 9 kHz to 25 MHz and inductive loop systems in the frequency range 9 kHz to
30 MHz; Harmonised Standard covering the essential requirements of article 3.2 of
Directive 2014/53/EU".
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.
ETSI

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8 Draft ETSI EN 303 447 V1.2.0 (2020-07)
[i.1] CEPT/ERC/REC 70-03: "Relating to the use of Short Range Devices (SRD)".
[i.2] EC Decision 2017/1483/EU: "Commission Implementing Decision (EU) 2017/1483 of
8 August 2017 amending Decision 2006/771/EC on harmonisation of the radio spectrum for use
by short-range devices and repealing Decision 2006/804/EC".
[i.3] 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.4] CEPT/ERC/REC 74-01: "Unwanted emissions in the spurious domain".
[i.5] 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.6] 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/EU of the European Parliament and of the Council.
[i.7] EGMF Robotic Mowers Boundary Wire Standard RLM003-1.1/2016.
[i.8] EN 50636-2-107:2015: "Safety of household and similar appliances - Part 2-107: Particular
requirements for robotic battery powered electrical lawnmowers", produced by CENELEC.
[i.9] ETSI EN 303 348: "Induction loop systems intended to assist the hearing impaired in the
frequency range 10 Hz to 9 kHz; Harmonised Standard covering the essential requirements of
article 3.2 of Directive 2014/53/EU".
[i.10] ETSI EN 303 454 (V1.1.1): "Short Range Devices (SRD); Metal and object detection sensors in
the frequency range 1 kHz to 148,5 kHz; Harmonised Standard covering the essential requirements
of article 3.2 of Directive 2014/53/EU".
[i.11] Directive 2006/42/EC or the European Parliament and of the Council of 17 May 2006 on
machinery, and amending Directive 95/16/EC (recast).
[i.12] Void.
[i.13] EN 55016-1-1:2010 + A1:2010 + A2:2014: "Specification for radio disturbance and immunity
measuring apparatus and methods -Part 1-1: Radio disturbance and immunity measuring apparatus
- Measuring apparatus", produced by CENELEC.
[i.14] ETSI TS 103 567 (V1.1.1): "Requirements on signal interferer handling".
[i.15] ETSI TS 103 051 (V1.1.1) (08-2011): "Electromagnetic compatibility and Radio spectrum
Matters (ERM); Expanded measurement uncertainty for the measurement of radiated
electromagnetic fields".
3 Definition of terms, symbols and abbreviations
3.1 Terms
For the purposes of the present document, the terms given in ETSI EN 300 330 [1] and the following apply:
99 % OBW function: measurement function of a spectrum analyser to measure the OBW
antenna: integral antenna, boundary loop, and/or guidance loop (both dependent and independent) which are used in
the RMI
NOTE 1: The inductive wire loops are installed dependent from the shape of the garden.
NOTE 2: To clarify the different loops see figure 2.
ETSI

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9 Draft ETSI EN 303 447 V1.2.0 (2020-07)
boundary loop: inductive wire loop which is defined by manufacturer and prepared by the user
NOTE 1: It can be implemented as a single or multiple turn coil installed by the user in accordance with instruction
from the manufacturer for the purpose of generating magnetic fields to determine the working area.
NOTE 2: To clarify the different loops see figure 2.
dependent guidance loop: guidance loop which is connected to boundary loop (e.g. via a T-junction) and the RMI
docking station
NOTE: To clarify the different loops see figure 2.
guidance loop: inductive wire loop which is defined by manufacturer and prepared by the user
NOTE: To clarify the different loops see figure 2.
inductive loop: electrical loop either wire or coil, where current is fed in order to generate a magnetic field intended for
guidance and/or communication with the robotic mower
NOTE: To clarify the different loops see figure 2.
integral antenna: single or multiple turn inductive loop preinstalled inside the RMI docking station
NOTE: To clarify the different loops see figure 2.
integral receiving antenna: single or multiple turn inductive loop preinstalled inside the robotic mower
Occupied BandWidth (OBW): width of a frequency band such that, below the lower and above the upper frequency
limits, the mean powers emitted are each equal to 0,5 % of the total mean power of a given emission
NOTE: To clarify Occupied BandWidth (OBW), see figure 1.

Figure 1: Occupied BandWidth (OBW)
RMI docking station: charging station for the robotic mower and the signal generator for the inductive loop(s) and, if
applicable, integral antenna(s)
NOTE: The RMI docking station can be seen as the signal generator/antenna connecting point. In addition, it is
the automatic battery charging facility located on or within the working area.
robotic mower: mobile part of the RMI including cutting means
NOTE: It is the receiving part inside the RMI.
Robotic Mower with Inductive loop system (RMI): system that include robotic mower, power supply, docking
station, and inductive loop(s)
working area: area in which the RMI can function
ETSI

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10 Draft ETSI EN 303 447 V1.2.0 (2020-07)

Figure 2: Overview of an RMI system, including the different possible antenna/loops
3.2 Symbols
For the purposes of the present docume
...

SLOVENSKI STANDARD
oSIST prEN 303 447 V1.2.0:2020
01-september-2020
Naprave kratkega dosega (SRD) - Sistemi z indukcijsko zanko za robotske
kosilnice - Harmonizirani standard za dostop do radijskega spektra
Short Range Devices (SRD) - Inductive loop systems for robotic mowers - Harmonised
Standard for access to radio spectrum
Ta slovenski standard je istoveten z: ETSI EN 303 447 V1.2.0 (2020-07)
ICS:
33.060.01 Radijske komunikacije na Radiocommunications in
splošno general
oSIST prEN 303 447 V1.2.0:2020 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN 303 447 V1.2.0:2020

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oSIST prEN 303 447 V1.2.0:2020
Draft ETSI EN 303 447 V1.2.0 (2020-07)






HARMONISED EUROPEAN STANDARD
Short Range Devices (SRD);
Inductive loop systems for robotic mowers;
Harmonised Standard for access to radio spectrum

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oSIST prEN 303 447 V1.2.0:2020
 2 Draft ETSI EN 303 447 V1.2.0 (2020-07)



Reference
REN/ERM-TG28-552
Keywords
harmonised standard, inductive, measurement,
radio
ETSI
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Tel.: +33 4 92 94 42 00  Fax: +33 4 93 65 47 16

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Sous-Préfecture de Grasse (06) N° 7803/88

Important notice
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All rights reserved.

DECT™, PLUGTESTS™, UMTS™ and the ETSI logo are trademarks of ETSI registered for the benefit of its Members.

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of the 3GPP Organizational Partners.
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®
GSM and the GSM logo are trademarks registered and owned by the GSM Association.
ETSI

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oSIST prEN 303 447 V1.2.0:2020
 3 Draft ETSI EN 303 447 V1.2.0 (2020-07)
Contents
Intellectual Property Rights . 5
Foreword . 5
Modal verbs terminology . 5
Introduction . 6
1 Scope . 7
2 References . 7
2.1 Normative references . 7
2.2 Informative references . 7
3 Definition of terms, symbols and abbreviations . 8
3.1 Terms . 8
3.2 Symbols . 10
3.3 Abbreviations . 10
4 Technical requirements specifications . 11
4.1 Environmental profile . 11
4.2 General . 11
4.2.1 Wanted technical performance criteria . 11
4.2.2 RMI modes . 11
4.2.2.1 General . 11
4.2.2.2 Operational Modes . 11
4.2.2.3 Safe Mode . 12
4.2.3 Presentation of equipment for testing purposes . 12
4.3 Transmitter conformance requirements . 12
4.3.1 Operating Frequency Range (OFR) . 12
4.3.1.1 Applicability. 12
4.3.1.2 Description . 12
4.3.1.3 Limits . 13
4.3.1.4 Conformance . 13
4.3.2 Transmitter H-field requirements . 13
4.3.2.1 Applicability. 13
4.3.2.2 Description . 13
4.3.2.3 Limits . 13
4.3.2.4 Conformance . 13
4.3.3 Transmitter spurious emis sions . 13
4.3.3.1 Applicability. 13
4.3.3.2 Description . 14
4.3.3.3 Limits . 14
4.3.3.4 Conformance . 15
4.3.4 Transmitter Out Of Band (OOB) emissions . 15
4.3.4.1 Applicability. 15
4.3.4.2 Description . 15
4.3.4.3 Limits . 15
4.3.4.4 Conformance . 15
4.4 Receiver conformance requirements . 15
4.4.1 Introduction. 15
4.4.2 Receiver Baseline Sensitivity . 15
4.4.2.1 Applicability. 15
4.4.2.2 Description . 16
4.4.2.3 Limits . 16
4.4.2.4 Conformance . 16
4.4.3 Receiver Baseline Resilience . 16
4.4.3.1 Applicability. 16
4.4.3.2 Description . 16
4.4.3.3 Limits . 16
4.4.3.4 Conformance . 16
ETSI

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 4 Draft ETSI EN 303 447 V1.2.0 (2020-07)
5 Testing for compliance with technical requirements . 17
5.1 Environmental conditions for testing . 17
5.2 General conditions for testing . 17
5.3 Artificial antenna . 17
5.4 Measuring receiver . 17
6 Conformance methods of measurement for transmitters and receivers . 18
6.1 General . 18
6.2 Transmitter conformance methods . 18
6.2.1 OFR . 18
6.2.2 H-field . 19
6.2.3 Transmitter unwanted emissions (spurious and OOB emissions) . 20
6.3 Receiver conformance methods . 20
6.3.1 Receiver spurious emissions . 20
6.3.2 Receiver Baseline Sensitivity . 20
6.3.2.1 General . 20
6.3.2.2 Receiver-Baseline Sensitivity Test . 22
6.3.3 Receiver Baseline Resilience . 22
6.3.3.1 General . 22
6.3.3.2 Test 1: if robotic mower can handle a lost signal . 22
6.3.3.3 Test 2: if robotic mower can handle a passage of the boundary wire . 24
Annex A (informative): Relationship between the present document and the essential
requirements of Directive 2014/53/EU . 26
Annex B (normative): Test sites and procedures . 27
B.1 Boundary and dependent guidance loops . 27
B.1.1 Artificial antenna for conducted measurements below 30 MHz . 27
B.1.2 General setup and measurement procedure for the current measurement with artificial antenna . 29
B.1.3 Differential mode measurement . 30
B.1.4 Common mode measurement . 31
B.1.5 The reference test garden. 31
B.2 Radiated measurements using anechoic chamber or open area test site . 31
Annex C (informative): Justification for missing RX-requirements from ETSI EG 203 336 . 33
C.1 Justification Receiver unwanted emissions . 33
C.2 Justification for other RX-requirements . 33
Annex D (informative): TX spurious emission limit assessment below 9 kHz . 35
Annex E (informative): Change history . 36
History . 37


ETSI

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oSIST prEN 303 447 V1.2.0:2020
 5 Draft ETSI EN 303 447 V1.2.0 (2020-07)
Intellectual Property Rights
Essential patents
IPRs essential or potentially essential to normative deliverables may have been declared to ETSI. The information
pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found
in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to 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 IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee
can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web
server) which are, or may be, or may become, essential to the present document.
Trademarks
The present document may include trademarks and/or tradenames which are asserted and/or registered by their owners.
ETSI claims no ownership of these except for any which are indicated as being the property of ETSI, and conveys no
right to use or reproduce any trademark and/or tradename. Mention of those trademarks in the present document does
not constitute an endorsement by ETSI of products, services or organizations associated with those trademarks.
Foreword
This draft Harmonised European Standard (EN) has been produced by ETSI Technical Committee Electromagnetic
compatibility and Radio spectrum Matters (ERM), and is now submitted for the combined Public Enquiry and Vote
phase of the ETSI standards EN Approval Procedure.
The present document has been prepared under the Commission's standardisation request C(2015) 5376 final [i.6] 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.3].
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.

Proposed national transposition dates
Date of latest announcement of this EN (doa): 3 months after ETSI publication
Date of latest publication of new National Standard
or endorsement of this EN (dop/e): 6 months after doa
Date of withdrawal of any conflicting National Standard (dow): 18 months after doa

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.
ETSI

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oSIST prEN 303 447 V1.2.0:2020
 6 Draft ETSI EN 303 447 V1.2.0 (2020-07)
Introduction
The present document covers Robotic Mowers with Inductive loop systems (RMI) using the frequency range below
148,5 kHz. An RMI system includes:
• RMI docking station: charging stations for the robotic mower and the signal generator/antenna connecting
point for the signals on the integral antenna and boundary wire.
• Robotic Mower: receiving part inside the RMI.
• Boundary Wire: user installed antenna.
The present document is structured as follows:
• Clauses 1 through 3 provide a general description on the types of equipment covered by the present document
and the definitions, symbols and abbreviations used.
• Clause 4 provides the technical requirements specifications, limits and conformance relative to transmitter and
receiver.
• Clause 5 specifies the conditions and information for testing of the equipment and interpretation of the
measurement results.
• Clause 6 specifies the required measurement methods.
• Annex A (informative) provides the relationship between the present document and the essential requirements
of Directive 2014/53/EU [i.3].
• Annex B (normative) provides necessary information on used test sites and procedures.
• Annex C (informative) provides the justification for missing RX-requirements from ETSI EG 203 336 [i.5].
• Annex D (informative) provides information on TX spurious emission limit assessment below 9 kHz.
• Annex E (informative) provides information on Change history.

ETSI

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oSIST prEN 303 447 V1.2.0:2020
 7 Draft ETSI EN 303 447 V1.2.0 (2020-07)
1 Scope
The present document specifies technical characteristics and methods of measurements for Robotic Mowers with
Inductive loop systems (RMI) below 148,5 kHz.
These radio equipment types are capable of operating in all or part of the frequency bands given in table 1.
Table 1: Permitted range of operation
Permitted range of operation
Transmit 100 Hz to 148,5 kHz
Receive 100 Hz to 148,5 kHz
NOTE: It should be noted that the frequency range between 9 kHz and
148,5 kHz is EU wide harmonised for inductive Short Range
Devices according to EC Decision 2017/1483/EU [i.2].

NOTE 1: The relationship between the present document and essential requirements of article 3.2 of Directive
2014/53/EU [i.3] is given in Annex A.
The present document only covers RMI systems with antenna sizes smaller than 1,67 km, see
CEPT/ERC/REC 70-03 [i.1], Annex 9.
NOTE 2: The antenna size is described by the distance between those two points on the antenna that have the
largest distance between them (e.g. for a rectangle shaped antenna the largest diagonal; for a circular
shaped antenna the diameter).
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 EN 300 330 (V2.1.1) (02-2017): "Short Range Devices (SRD); Radio equipment in the
frequency range 9 kHz to 25 MHz and inductive loop systems in the frequency range 9 kHz to
30 MHz; Harmonised Standard covering the essential requirements of article 3.2 of
Directive 2014/53/EU".
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.
ETSI

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oSIST prEN 303 447 V1.2.0:2020
 8 Draft ETSI EN 303 447 V1.2.0 (2020-07)
[i.1] CEPT/ERC/REC 70-03: "Relating to the use of Short Range Devices (SRD)".
[i.2] EC Decision 2017/1483/EU: "Commission Implementing Decision (EU) 2017/1483 of
8 August 2017 amending Decision 2006/771/EC on harmonisation of the radio spectrum for use
by short-range devices and repealing Decision 2006/804/EC".
[i.3] 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.4] CEPT/ERC/REC 74-01: "Unwanted emissions in the spurious domain".
[i.5] 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.6] 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/EU of the European Parliament and of the Council.
[i.7] EGMF Robotic Mowers Boundary Wire Standard RLM003-1.1/2016.
[i.8] EN 50636-2-107:2015: "Safety of household and similar appliances - Part 2-107: Particular
requirements for robotic battery powered electrical lawnmowers", produced by CENELEC.
[i.9] ETSI EN 303 348: "Induction loop systems intended to assist the hearing impaired in the
frequency range 10 Hz to 9 kHz; Harmonised Standard covering the essential requirements of
article 3.2 of Directive 2014/53/EU".
[i.10] ETSI EN 303 454 (V1.1.1): "Short Range Devices (SRD); Metal and object detection sensors in
the frequency range 1 kHz to 148,5 kHz; Harmonised Standard covering the essential requirements
of article 3.2 of Directive 2014/53/EU".
[i.11] Directive 2006/42/EC or the European Parliament and of the Council of 17 May 2006 on
machinery, and amending Directive 95/16/EC (recast).
[i.12] Void.
[i.13] EN 55016-1-1:2010 + A1:2010 + A2:2014: "Specification for radio disturbance and immunity
measuring apparatus and methods -Part 1-1: Radio disturbance and immunity measuring apparatus
- Measuring apparatus", produced by CENELEC.
[i.14] ETSI TS 103 567 (V1.1.1): "Requirements on signal interferer handling".
[i.15] ETSI TS 103 051 (V1.1.1) (08-2011): "Electromagnetic compatibility and Radio spectrum
Matters (ERM); Expanded measurement uncertainty for the measurement of radiated
electromagnetic fields".
3 Definition of terms, symbols and abbreviations
3.1 Terms
For the purposes of the present document, the terms given in ETSI EN 300 330 [1] and the following apply:
99 % OBW function: measurement function of a spectrum analyser to measure the OBW
antenna: integral antenna, boundary loop, and/or guidance loop (both dependent and independent) which are used in
the RMI
NOTE 1: The inductive wire loops are installed dependent from the shape of the garden.
NOTE 2: To clarify the different loops see figure 2.
ETSI

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 9 Draft ETSI EN 303 447 V1.2.0 (2020-07)
boundary loop: inductive wire loop which is defined by manufacturer and prepared by the user
NOTE 1: It can be implemented as a single or multiple turn coil installed by the user in accordance with instruction
from the manufacturer for the purpose of generating magnetic fields to determine the working area.
NOTE 2: To clarify the different loops see figure 2.
dependent guidance loop: guidance loop which is connected to boundary loop (e.g. via a T-junction) and the RMI
docking station
NOTE: To clarify the different loops see figure 2.
guidance loop: inductive wire loop which is defined by manufacturer and prepared by the user
NOTE: To clarify the different loops see figure 2.
inductive loop: electrical loop either wire or coil, where current is fed in order to generate a magnetic field intended for
guidance and/or communication with the robotic mower
NOTE: To clarify the different loops see figure 2.
integral antenna: single or multiple turn inductive loop preinstalled inside the RMI docking station
NOTE: To clarify the different loops see figure 2.
integral receiving antenna: single or multiple turn inductive loop preinstalled inside the robotic mower
Occupied BandWidth (OBW): width of a frequency band such that, below the lower and above the upper frequency
limits, the mean p
...

SLOVENSKI STANDARD
oSIST prEN 303 447 V1.3.0:2021
01-december-2021
Naprave kratkega dosega (SRD) - Sistemi z indukcijsko zanko za robotske
kosilnice - Harmonizirani standard za dostop do radijskega spektra
Short Range Devices (SRD) - Inductive loop systems for robotic mowers - Harmonised
Standard for access to radio spectrum
Ta slovenski standard je istoveten z: ETSI EN 303 447 V1.3.0 (2021-09)
ICS:
33.060.01 Radijske komunikacije na Radiocommunications in
splošno general
oSIST prEN 303 447 V1.3.0:2021 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN 303 447 V1.3.0:2021

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oSIST prEN 303 447 V1.3.0:2021
Draft ETSI EN 303 447 V1.3.0 (2021-09)






HARMONISED EUROPEAN STANDARD
Short Range Devices (SRD);
Inductive loop systems for robotic mowers;
Harmonised Standard for access to radio spectrum

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 2 Draft ETSI EN 303 447 V1.3.0 (2021-09)

Reference
REN/ERM-TG28-552
Keywords
harmonised standard, inductive, measurement,
radio
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© ETSI 2021.
All rights reserved.

ETSI

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 3 Draft ETSI EN 303 447 V1.3.0 (2021-09)
Contents
Intellectual Property Rights . 5
Foreword . 5
Modal verbs terminology . 6
Introduction . 6
1 Scope . 7
2 References . 7
2.1 Normative references . 7
2.2 Informative references . 8
3 Definition of terms, symbols and abbreviations . 9
3.1 Terms . 9
3.2 Symbols . 11
3.3 Abbreviations . 11
4 Technical requirements specifications . 11
4.1 Environmental profile . 11
4.2 General . 11
4.2.1 Wanted technical performance criteria . 11
4.2.2 RMI modes . 12
4.2.2.1 General . 12
4.2.2.2 Operational Modes . 12
4.2.2.3 Safe Mode . 12
4.2.3 Presentation of equipment for testing purposes . 12
4.3 Transmitter conformance requirements . 12
4.3.1 Operating Frequency Range (OFR) . 12
4.3.1.1 Applicability. 12
4.3.1.2 Description . 13
4.3.1.3 Limits . 13
4.3.1.4 Conformance . 13
4.3.2 Transmitter H-field requirements . 13
4.3.2.1 Applicability. 13
4.3.2.2 Description . 13
4.3.2.3 Limits . 14
4.3.2.4 Conformance . 14
4.3.3 Transmitter spurious emis sions . 14
4.3.3.1 Applicability. 14
4.3.3.2 Description . 14
4.3.3.3 Limits . 15
4.3.3.4 Conformance . 15
4.3.4 Transmitter Out Of Band (OOB) emissions . 15
4.3.4.1 Applicability. 15
4.3.4.2 Description . 15
4.3.4.3 Limits . 16
4.3.4.4 Conformance . 16
4.4 Receiver conformance requirements . 16
4.4.1 Introduction. 16
4.4.2 Receiver Spurious Emissions . 16
4.4.2.1 Applicability. 16
4.4.2.2 Description . 16
4.4.2.3 Limits . 16
4.4.2.4 Conformance . 16
4.4.3 Receiver Baseline Sensitivity . 16
4.4.3.1 Applicability. 16
4.4.3.2 Description . 17
4.4.3.3 Limits . 17
4.4.3.4 Conformance . 17
ETSI

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4.4.4 Receiver Baseline Resilience . 17
4.4.4.1 Applicability. 17
4.4.4.2 Description . 17
4.4.4.3 Limits . 17
4.4.4.4 Conformance . 17
5 Testing for compliance with technical requirements . 18
5.1 Environmental conditions for testing . 18
5.2 General conditions for testing . 18
5.3 Artificial antenna . 18
5.4 Measuring receiver . 18
6 Conformance methods of measurement for transmitters and receivers . 19
6.1 General . 19
6.2 Transmitter conformance methods . 19
6.2.1 OFR . 19
6.2.2 H-field . 20
6.2.3 Transmitter unwanted emissions (spurious and OOB emissions) . 21
6.3 Receiver conformance methods . 21
6.3.1 Receiver spurious emissions . 21
6.3.2 Receiver Baseline Sensitivity . 22
6.3.2.1 General . 22
6.3.2.2 Receiver-Baseline Sensitivity Test . 23
6.3.3 Receiver Baseline Resilience . 23
6.3.3.1 General . 23
6.3.3.2 Test 1: to test that the robotic mower can handle a lost signal . 24
6.3.3.3 Test 2: to test that the robotic mower can handle a passage of the boundary wire . 25
Annex A (informative): Relationship between the present document and the essential
requirements of Directive 2014/53/EU . 27
Annex B (normative): Test sites and procedures . 29
B.1 Boundary and dependent guidance loops . 29
B.1.1 Artificial antenna for conducted measurements below 30 MHz . 29
B.1.2 General setup and measurement procedure for the current measurement with artificial antenna . 31
B.1.3 Differential mode measurement . 32
B.1.4 Common mode measurement . 33
B.1.5 The reference test garden. 33
B.1.6 Test setup for verification artificial antenna . 33
B.1.6.1 General . 33
B.1.6.2 For Differential Mode Impedance verification . 34
B.1.6.3 For Common Mode Impedance verification . 34
B.2 Radiated measurements using anechoic chamber or open area test site . 35
B.2.1 General . 35
B.2.2 . Radiated emission measurements < 30
MHz . 36
B.2.3 Radiated emission measurements 30 MHz to 1 000 MHz. 36
Annex C (informative): Justification for missing RX-requirements from ETSI EG 203 336 . 37
C.1 Justification for other RX-requirements . 37
Annex D (informative): TX spurious emission limit assessment below 9 kHz . 39
Annex E (informative): Change history . 40
History . 41


ETSI

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 5 Draft ETSI EN 303 447 V1.3.0 (2021-09)
Intellectual Property Rights
Essential patents
IPRs essential or potentially essential to normative deliverables may have been declared to ETSI. The declarations
pertaining to these essential IPRs, if any, are publicly available for ETSI members and non-members, and can be
found in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to
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,
including IPR searches, has been carried out by ETSI. No guarantee can be given as to the existence of other IPRs not
referenced in ETSI SR 000 314 (or the updates on the ETSI Web server) which are, or may be, or may become,
essential to the present document.
Trademarks
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ETSI claims no ownership of these except for any which are indicated as being the property of ETSI, and conveys no
right to use or reproduce any trademark and/or tradename. Mention of those trademarks in the present document does
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DECT™, PLUGTESTS™, UMTS™ and the ETSI logo are trademarks of ETSI registered for the benefit of its

Members. 3GPP™ and LTE™ are trademarks of ETSI registered for the benefit of its Members and of the 3GPP
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®
oneM2M Partners. GSM and the GSM logo are trademarks registered and owned by the GSM Association.
Foreword
This draft Harmonised European Standard (EN) has been produced by ETSI Technical Committee Electromagnetic
compatibility and Radio spectrum Matters (ERM), and is now submitted for the combined Public Enquiry and Vote
phase of the ETSI standards EN Approval Procedure.
The present document has been prepared under the Commission's standardisation request C(2015) 5376 final [i.6] 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.3].
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.

Proposed national transposition dates
Date of latest announcement of this EN (doa): 3 months after ETSI publication
Date of latest publication of new National Standard
or endorsement of this EN (dop/e): 6 months after doa
Date of withdrawal of any conflicting National Standard (dow): 18 months after doa

ETSI

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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
The present document covers Robotic Mowers with Inductive loop systems (RMI) using the frequency range below
148,5 kHz. An RMI system includes:
• RMI docking station: charging stations for the robotic mower and the signal generator/antenna connecting
point for the signals on the integral antenna and boundary wire.
• Robotic Mower: receiving part inside the RMI.
• Boundary Wire: user installed antenna.
The present document is structured as follows:
• Clauses 1, 2 and 3 provide a general description on the types of equipment covered by the present document
and the definitions, symbols and abbreviations used.
• Clause 4 provides the technical requirements specifications, limits and conformance relative to transmitter and
receiver.
• Clause 5 specifies the conditions and information for testing of the equipment and interpretation of the
measurement results.
• Clause 6 specifies the required measurement methods.
• Annex A (informative) provides the relationship between the present document and the essential requirements
of Directive 2014/53/EU [i.3].
• Annex B (normative) provides necessary information on used test sites and procedures.
• Annex C (informative) provides the justification for missing RX-requirements from ETSI EG 203 336 [i.5].
• Annex D (informative) provides information on TX spurious emission limit assessment below 9 kHz.
• Annex E (informative) provides information on Change history.

ETSI

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1 Scope
The present document specifies technical characteristics and methods of measurements for Robotic Mowers with
Inductive loop systems (RMI) below 148,5 kHz.
The present document covers the following RMI systems:
• RMI1 systems: RMI systems without receive only mode of the robotic mower
• RMI2 systems: RMI systems with receive only mode of the robotic mower
NOTE 1: In RMI1 systems the robotic mower is not able to restart automatically if the boundary signal comes back
after the loss of the boundary signal (safe mode, see clause 4.2.2.3), while in RMI2 systems the robotic
mower is able to restart automatically after the boundary signal is back. This differentiation has been
introduced to cover receiver spurious emisisons for RMI2 systems.
These radio equipment types are capable of operating in all or part of the frequency bands given in table 1.
Table 1: Permitted range of operation
Permitted range of operation
Transmit 100 Hz to 148,5 kHz
Receive 100 Hz to 148,5 kHz
NOTE: It should be noted that the frequency range between 9 kHz and
148,5 kHz is EU wide harmonised for inductive Short Range
Devices according to EC Decision 2017/1483/EU [i.2].

NOTE 2: The relationship between the present document and essential requirements of article 3.2 of Directive
2014/53/EU [i.3] is given in Annex A.
The present document only covers RMI systems with antenna sizes smaller than 1,67 km, see
CEPT/ERC/REC 70-03 [i.1], Annex 9.
NOTE 3: The antenna size is described by the distance between those two points on the antenna that have the
largest distance between them (e.g. for a rectangle shaped antenna the largest diagonal; for a circular
shaped antenna the diameter).
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 EN 300 330 (V2.1.1) (02-2017): "Short Range Devices (SRD); Radio equipment in the
frequency range 9 kHz to 25 MHz and inductive loop systems in the frequency range 9 kHz to
30 MHz; Harmonised Standard covering the essential requirements of article 3.2 of
Directive 2014/53/EU".
ETSI

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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] CEPT/ERC/REC 70-03: "Relating to the use of Short Range Devices (SRD)".
[i.2] EC Decision 2017/1483/EU: "Commission Implementing Decision (EU) 2017/1483 of
8 August 2017 amending Decision 2006/771/EC on harmonisation of the radio spectrum for use
by short-range devices and repealing Decision 2006/804/EC".
[i.3] 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.4] CEPT/ERC/REC 74-01: "Unwanted emissions in the spurious domain".
[i.5] 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.6] Commission Implementing D
...