The present document applies to the following radio equipment types:
1) Repeaters for GSM.
This radio equipment type is capable of operating in all or any part of the frequency bands given in table 1-1.
NOTE 1: In some circumstances, for instance when an operator (or more than one operator who co-ordinate the use of repeaters), is not allocated a complete band as defined in table 1-1, it may be necessary to restrict the frequency range of operations of repeaters. In these circumstances, the test of "Gain outside pass band" in annex C may be used to verify the performance of the repeater.
NOTE 2: A repeater is designed to operate in one or several pass bands within the MS and BTS relevant transmit bands.
The present document covers requirements for GSM Repeaters for 3GPP Release 8, 9, 10, 11 and 12. The present document contains requirements to demonstrate that radio equipment both effectively uses and supports the efficient use of radio spectrum in order to avoid harmful interference.

Globalni sistem mobilnih komunikacij (GSM) - Ponavljalniki GSM - Harmonizirani standard, ki zajema bistvene zahteve člena 3.2 direktive 2014/53/EU

Ta dokument se uporablja za radijsko opremo naslednjih vrst:
1) ponavljalniki za GSM.
Ta vrsta radijske opreme lahko deluje v vseh delih frekvenčnih pasov iz preglednice 1-1.
OPOMBA 1: V nekaterih okoliščinah, ko operaterju (ali operaterjem, ki usklajujejo rabo ponavljalnikov) na primer ni dodeljen celoten pas, kot je določeno v preglednici 1-1, bo morda treba omejiti frekvenčno območje delovanja ponavljalnikov. V takšnih okoliščinah se za preverjanje učinkovitosti ponavljalnika lahko uporabi preskus dostopa zunaj prepustnega pasu iz dodatka C.
OPOMBA 2: ponavljalnik je namenjen delovanju v enem ali več pasovih v okviru pasov prenosa mobilne postaje (MS) in bazne sprejemno-oddajne postaje (BTS).
Ta dokument vključuje zahteve za ponavljalnike GSM za izdaje 8, 9, 10, 11 in 12 standarda 3GPP. Ta dokument vsebuje zahteve, s katerimi se dokazuje, da radijska oprema učinkovito uporablja in tudi podpira učinkovito uporabo radijskega spektra, tako da ne pride do škodljivih motenj.

General Information

Status
Published
Public Enquiry End Date
31-Mar-2016
Publication Date
04-May-2016
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
18-Apr-2016
Due Date
23-Jun-2016
Completion Date
05-May-2016
Mandate

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SIST EN 303 609 V12.5.1:2016
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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.+DUPRQL]LUDQL(8Global System for Mobile communications (GSM) - GSM Repeaters - Harmonised Standard covering the essential requirements of article 3.2 of the Directive 2014/53/EU33.070.50Globalni sistem za mobilno telekomunikacijo (GSM)Global System for Mobile Communication (GSM)ICS:Ta slovenski standard je istoveten z:ETSI EN 303 609 V12.5.1 (2016-04)SIST EN 303 609 V12.5.1:2016en01-junij-2016SIST EN 303 609 V12.5.1:2016SLOVENSKI

STANDARD
SIST EN 303 609 V12.5.1:2016

ETSI EN 303 609 V12.5.1 (2016-04) Global System for Mobile communications (GSM); GSM Repeaters; Harmonised Standard covering the essential requirements of article 3.2 of the Directive 2014/53/EU

HARMONISED EUROPEAN STANDARD SIST EN 303 609 V12.5.1:2016
ETSI ETSI EN 303 609 V12.5.1 (2016-04) 2

Reference REN/MSG-0021-RED Keywords cellular, ER-GSM, GSM, repeater, R-GSM 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 only prevailing document is the print of the Portable Document Format (PDF) version kept on a specific network drive within ETSI Secretariat. 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.

© European Telecommunications Standards Institute 2016. All rights reserved.

DECTTM, PLUGTESTSTM, UMTSTM and the ETSI logo are Trade Marks of ETSI registered for the benefit of its Members. 3GPPTM and LTE™ are Trade Marks of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners. GSM® and the GSM logo are Trade Marks registered and owned by the GSM Association. SIST EN 303 609 V12.5.1:2016

ETSI ETSI EN 303 609 V12.5.1 (2016-04) 3 Contents Intellectual Property Rights ................................................................................................................................ 5 Foreword ............................................................................................................................................................. 5 Modal verbs terminology .................................................................................................................................... 5 Introduction ........................................................................................................................................................ 5 1 Scope ........................................................................................................................................................ 6 2 References ................................................................................................................................................ 6 2.1 Normative references ......................................................................................................................................... 6 2.2 Informative references ........................................................................................................................................ 7 3 Definitions and abbreviations ................................................................................................................... 7 3.1 Definitions .......................................................................................................................................................... 7 3.2 Abbreviations ..................................................................................................................................................... 8 4 Technical requirements specifications ..................................................................................................... 8 4.1 Environmental profile ......................................................................................................................................... 8 4.2 Conformance requirements ................................................................................................................................ 8 4.2.0 Introduction................................................................................................................................................... 8 4.2.1 Conducted spurious emissions ...................................................................................................................... 9 4.2.1.1 Definition ................................................................................................................................................ 9 4.2.1.2 Limit ........................................................................................................................................................ 9 4.2.1.3 Conformance ......................................................................................................................................... 10 4.2.2 Radiated spurious emissions ....................................................................................................................... 10 4.2.2.1 Definition .............................................................................................................................................. 10 4.2.2.2 Limit ...................................................................................................................................................... 10 4.2.2.3 Conformance ......................................................................................................................................... 10 4.2.3 Intermodulation attenuation ........................................................................................................................ 10 4.2.3.1 Definition .............................................................................................................................................. 10 4.2.3.2 Limit ...................................................................................................................................................... 11 4.2.3.3 Conformance ......................................................................................................................................... 11 4.2.4 Out-of-band gain ......................................................................................................................................... 11 4.2.4.1 Definition .............................................................................................................................................. 11 4.2.4.2 Limit ...................................................................................................................................................... 11 4.2.4.3 Conformance ......................................................................................................................................... 11 4.2.5 Frequency error ........................................................................................................................................... 11 4.2.5.1 Definition .............................................................................................................................................. 11 4.2.5.2 Limit ...................................................................................................................................................... 11 4.2.5.3 Conformance ......................................................................................................................................... 11 5 Testing for compliance with technical requirements .............................................................................. 12 5.1 Environmental conditions for testing ............................................................................................................... 12 5.2 Interpretation of the measurement results ........................................................................................................ 12 5.3 Essential radio test suites .................................................................................................................................. 13 5.3.1 Conducted spurious emissions .................................................................................................................... 13 5.3.1.1 Initial conditions ................................................................................................................................... 13 5.3.1.2 Procedures ............................................................................................................................................. 13 5.3.1.3 Test requirement ................................................................................................................................... 13 5.3.2 Radiated spurious emissions ....................................................................................................................... 13 5.3.2.1 Initial conditions ................................................................................................................................... 13 5.3.2.2 Procedures ............................................................................................................................................. 13 5.3.2.3 Test requirement ................................................................................................................................... 14 5.3.3 Intermodulation attenuation ........................................................................................................................ 14 5.3.3.1 Initial conditions ................................................................................................................................... 14 5.3.3.2 Procedures ............................................................................................................................................. 14 5.3.3.3 Test requirement ................................................................................................................................... 14 5.3.4 Out-of-band gain ......................................................................................................................................... 14 5.3.4.1 Initial conditions ................................................................................................................................... 14 5.3.4.2 Procedures ............................................................................................................................................. 14 SIST EN 303 609 V12.5.1:2016

ETSI ETSI EN 303 609 V12.5.1 (2016-04) 4 5.3.4.3 Test requirement ................................................................................................................................... 15 5.3.5 Frequency error ........................................................................................................................................... 15 5.3.5.1 Initial conditions ................................................................................................................................... 15 5.3.5.2 Procedures ............................................................................................................................................. 15 Annex A (normative): Relationship between the present document and the essential requirements of Directive 2014/53/EU ......................................................... 16 Annex B (informative): Environmental profile specification ............................................................. 17 Annex C (informative): Testing of gain for part band repeaters ....................................................... 18 C.1 Rationale for this test .............................................................................................................................. 18 C.2 Gain outside pass band ........................................................................................................................... 18 C.2.1 Test purpose ..................................................................................................................................................... 18 C.2.2 Test case ........................................................................................................................................................... 18 C.2.3 Conformance requirement ................................................................................................................................ 18 History .............................................................................................................................................................. 19

SIST EN 303 609 V12.5.1:2016

ETSI ETSI EN 303 609 V12.5.1 (2016-04) 5 Intellectual Property Rights IPRs essential or potentially essential to the present document 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. Foreword This Harmonised European Standard (EN) has been produced by ETSI Technical Committee Mobile Standards Group (MSG). For non EU countries the present document may be used for regulatory (Type Approval) purposes. The present document has been prepared under the Commission's standardisation request C(2015) 5376 final [i.5] to provide one voluntary means of conforming to the essential requirements of Directive 2014/53/EU on the harmonisation of the laws of the Member States relating to the making available on the market of radio equipment and repealing Directive 1999/5/EC [i.1]. Once the present document is cited in the Official Journal of the European Union under that Directive, compliance with the normative clauses of the present document given in table A.1 confers, within the limits of the scope of the present document, a presumption of conformity with the corresponding essential requirements of that Directive, and associated EFTA regulations.

National transposition dates Date of adoption of this EN: 6 April 2016 Date of latest announcement of this EN (doa): 31 July 2016 Date of latest publication of new National Standard or endorsement of this EN (dop/e):

31 January 2017 Date of withdrawal of any conflicting National Standard (dow): 31 January 2018

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 is a revision of ETSI EN 300 609-4. The present document is part of a set of standards developed by ETSI that are designed to fit in a modular structure to cover radio equipment within the scope of the Directive 2014/53/EU [i.1]. The present document is produced following the guidance in ETSI EG 203 336 [i.2] as applicable.

SIST EN 303 609 V12.5.1:2016

ETSI ETSI EN 303 609 V12.5.1 (2016-04) 6 1 Scope The present document applies to the following radio equipment types: 1) Repeaters for GSM. This radio equipment type is capable of operating in all or any part of the frequency bands given in table 1-1. Table 1-1: GSM Repeater frequency bands GSM band Direction of transmission GSM Repeater relevant frequency bands P-GSM 900 Downlink 935 MHz to 960 MHz Uplink 890 MHz to 915 MHz E-GSM 900 Downlink 925 MHz to 960 MHz Uplink 880 MHz to 915 MHz R-GSM 900 Downlink 921 MHz to 960 MHz Uplink 876 MHz to 915 MHz ER-GSM 900 Downlink 918 MHz to 960 MHz Uplink 873 MHz to 915 MHz DCS 1 800 Downlink 1 805 MHz to 1 880 MHz Uplink 1 710 MHz to 1 785 MHz GSM 450 Downlink 460,4 MHz to 467,6 MHz Uplink 450,4 MHz to 457,6 MHz GSM 480 Downlink 488,8 MHz to 496 MHz Uplink 478,8 MHz to 486 MHz

NOTE 1: In some circumstances, for instance when an operator (or more than one operator who co-ordinate the use of repeaters), is not allocated a complete band as defined in table 1-1, it may be necessary to restrict the frequency range of operations of repeaters. In these circumstances, the test of "Gain outside pass band" in annex C may be used to verify the performance of the repeater. NOTE 2: A repeater is designed to operate in one or several pass bands within the MS and BTS relevant transmit bands. The present document covers requirements for GSM Repeaters for 3GPP Release 8, 9, 10, 11 and 12. The present document contains requirements to demonstrate that radio equipment both effectively uses and supports the efficient use of radio spectrum in order to avoid harmful interference.

2 References 2.1 Normative references References are either specific (identified by date of publication and/or edition number or version number) or non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the referenced document (including any amendments) applies. Referenced documents which are not found to be publicly available in the expected location might be found at http://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 TS 151 026 (V12.0.0) (10-2014): "Digital cellular telecommunications system (Phase 2+); Base Station System (BSS) equipment specification; Part 4: Repeaters (3GPP TS 51.026 version 12.0.0 Release 12)". [2] Recommendation ITU-R SM.329-12 (09-2012): "Unwanted emissions in the spurious domain". SIST EN 303 609 V12.5.1:2016

ETSI ETSI EN 303 609 V12.5.1 (2016-04) 7 2.2 Informative references References are either specific (identified by date of publication and/or edition number or version number) or non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the referenced document (including any amendments) applies. NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee their long term validity. The following referenced documents are not necessary for the application of the present document but they assist the user with regard to a particular subject area. [i.1] Directive 2014/53/EU of the European parliament and of the council of 16 April 2014 on the harmonisation of the laws of the Member States relating to the making available on the market of radio equipment and repealing Directive 1999/5/EC. [i.2] ETSI EG 203 336 (V1.1.1) (08-2015): " Electromagnetic compatibility and Radio spectrum Matters (ERM); 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.3] ETSI TR 100 028 (all parts) (V1.4.1) (12-2001): "Electromagnetic compatibility and Radio spectrum Matters (ERM); Uncertainties in the measurement of mobile radio equipment characteristics". [i.4] ETSI TS 145 005 (V12.5.0) (04-2015): "Digital cellular telecommunications system (Phase 2+); Radio Transmission and reception (3GPP TS 45.005 version 12.5.0 Release 12)". [i.5] 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. 3 Definitions and abbreviations 3.1 Definitions For the purposes of the present document, the following terms and definitions apply: broadband repeater: repeater which is designed for operation on any combination of ARFCNs (up to a specified maximum number) within the relevant band of the repeater channelized repeater: repeater which is designed for operation on a specified subset of ARFCNs within the operating band of the repeater NOTE: The subset of ARFCNs may be determined during the manufacture of the repeater, or may be programmable. E-GSM: extended GSM 900 band (includes P-GSM band) ER-GSM 900: extended Railway GSM 900 band (includes R-GSM band) GSM: unless otherwise specified, references to GSM include GSM 400, GSM 900, ER-GSM 900 and DCS 1 800 GSM 400: unless otherwise specified, references to GSM 400 include GSM 450 and GSM 480 band GSM 900: unless otherwise specified, references to GSM 900 include P-GSM, E-GSM and R-GSM band GSM-R: GSM Railway communication, operated in the R-GSM or ER-GSM band, respectively P-GSM: primary GSM 900 band SIST EN 303 609 V12.5.1:2016

ETSI ETSI EN 303 609 V12.5.1 (2016-04) 8 pass band: frequency range that the Repeater operates in with operational configuration NOTE: This frequency range can correspond to one or several consecutive nominal channels. If they are not consecutive each subset of channels have to be considered as an individual pass band. The Repeater can have one or several pass bands. relevant band: frequency band of GSM Repeater declared by the manufacturer according to the designations in table 1-1 repeater: bi-directional Radio Frequency (RF) amplifier which can amplify and transmit a received Mobile Station (MS) signal in the GSM MS transmit band, simultaneously it can amplify and transmit a radiated or conducted received Base Transceiver Station (BTS) RF signal in the GSM BTS transmit band R-GSM: Railways GSM 900 band (includes P-GSM band and E-GSM band) repeater system using frequency shift: repeater system consisting of two different elements, a master unit close to the BTS and at least one remote unit close to the area to be covered NOTE: The master unit amplifies the channels from the BTS and shifts them to different GSM channels. In the remote unit the shifted channels from the master unit will be transferred back to the original channels and amplified. This is valid for the downlink signals as well as for the uplink signals. 3.2 Abbreviations For the purposes of the present document, the following abbreviations apply: ARFCN Absolute Radio Frequency Channel Number BSS Base Station System BTS Base Transceiver Station CW Continuous Wave DCS Digital Cellular System DUT Device Under Test EFTA European Free Trade Association ER-GSM Extended Railways GSM GSM General System for Mobile communications GSM-R GSM Railway MS Mobile Station RF Radio Frequency RMS Root Mean Square RSS Root Sum of the Squares 4 Technical requirements specifications 4.1 Environmental profile The technical requirements of the present document apply under the environmental profile for operation of the equipment, which shall be declared by the supplier. The equipment shall comply with all the technical requirements of the present document at all times when operating within the boundary limits of the declared operational environmental profile. For guidance on how a supplier can declare the environmental profile see annex B. 4.2 Conformance requirements 4.2.0 Introduction To meet the essential requirement under article 3.2 of Directive 2014/53/EU [i.1] for Repeater four essential parameters have been identified. Table 4.2.0-1 provides a cross reference between these four essential parameters and the corresponding seven technical requirements for equipment within the scope of the present document. SIST EN 303 609 V12.5.1:2016

ETSI ETSI EN 303 609 V12.5.1 (2016-04) 9 Table 4.2.0-1: Essential parameters, corresponding technical requirements and test suites Essential parameters Corresponding technical requirements Corresponding test suites Transmitter and receiver unwanted emissions in the spurious domain 4.2.1 Conducted spurious emissions 5.3.1 Radiated emissions 4.2.2 Radiated spurious emissions 5.3.2 Transmitter spectrum mask 4.2.3 Intermodulation attenuation 5.3.3 Transmitter unwanted emissions in the out of band domain Receiver radio-frequency intermodulation Receiver adjacent signal selectivity 4.2.4 Out of band gain 5.3.4 Transmitter frequency stability 4.2.5 Frequency error 5.3.5

NOTE: Some of the essential parameters of the ETSI EG 203 336 [i.2] are not included into the present document since those requirements are not applicable for repeater equipment. 4.2.1 Conducted spurious emissions 4.2.1.1 Definition This test measures the conducted spurious emissions at the antenna ports. 4.2.1.2 Limit This requirement applies to all antenna ports of the repeater, at maximum gain, and with the following input signals: • without any RF input signal; • with a continuous sinusoidal RF signal at a level which will result, when measured, in the maximum rated RF output power per channel, as declared by the manufacturer RF input signal. The measured power shall not exceed: • -36 dBm (250 nW) in the frequency band 9 kHz to 1 GHz; • -30 dBm (1 µW) in the frequency band 1 GHz to 12,75 GHz. Table 4.2.1.2-1: Measurement bandwidth for spurious emissions Band Frequency offset Measurement bandwidth

(offset from carrier)

In the relevant BTS transmit Band or MS transmit band ≥ 100 kHz 3 kHz 100 kHz to 50 MHz - 10 kHz 50 MHz to 500 MHz outside the relevant transmit band (offset from edge of the relevant transmit band)

> 0 MHz 10 kHz
≥ 2 MHz 30 kHz
≥ 5 MHz 100 kHz Above 500 MHz outside the (offset from edge of the
relevant transmit band relevant transmit band)
> 0 MHz 10 kHz
≥ 2 MHz 30 kHz
≥ 5 MHz 100 kHz
≥ 10 MHz 300 kHz
≥ 20 MHz 1 MHz
≥ 30 MHz 3 MHz
SIST EN 303 609 V12.5.1:2016

ETSI ETSI EN 303 609 V12.5.1 (2016-04) 10 4.2.1.3 Conformance Conformance tests described in clause 5.3.1 shall be carried out. 4.2.2 Radiated spurious emissions 4.2.2.1 Definition This test measures the effective power of spurious emissions radiated by the cabinet and structure. 4.2.2.2 Limit This requirement applies to all antenna ports of the repeater, at maximum gain, and with the following input signals: • without any RF input signal; • with a continuous sinusoidal RF signal at a level which will result, when measured, in the maximum rated RF output power per channel, as declared by the manufacturer RF input signal. The effective radiated power shall not exceed: • -36 dBm (250 nW) in the frequency band 30 MHz to 1 GHz; • -30 dBm (1µW) in the frequency band 1 GHz to 12,75 GHz. Table 4.2.2.2-1: Measurement bandwidth for spurious emissions Band Frequency offset Measurement bandwidth

(offset from carrier)

In the relevant BTS transmit Band or MS transmit band ≥ 100 kHz 3 kHz 30 MHz to 50 MHz - 10 kHz 50 MHz to 500 MHz outside the relevant transmit band (offset from edge of the relevant transmit band)

> 0 MHz 10 kHz
≥ 2 MHz 30 kHz
≥ 5 MHz 100 kHz Above 500 MHz outside the (offset from edge of the
relevant transmit band relevant transmit band)
> 0 MHz 10 kHz
≥ 2 MHz 30 kHz
≥ 5 MHz 100 kHz
≥ 10 MHz 300 kHz
≥ 20 MHz 1 MHz
≥ 30 MHz 3 MHz

4.2.2.3 Conformance Conformance tests described in clause 5.3.2 shall be carried out. 4.2.3 Intermodulation attenuation 4.2.3.1 Definition To verify that the level of intermodulation products, generated in non-linear elements of the repeater, in the presence of two RF input signals, do not exceed the specified limits. SIST EN 303 609 V12.5.1:2016

ETSI ETSI EN 303 609 V12.5.1 (2016-04) 11 4.2.3.2 Limit This requirement applies to all antenna ports of the repeater, at maximum gain, and with the following input signals: • with a continuous sinusoidal RF signal at a level which will result, when measured, in the maximum rated RF output power per channel, as declared by the manufacturer RF input signal; • with 10 dB increased continuous sinusoidal RF signals compared to the continuous sinusoidal RF signal at a level which will result, when measured, in the maximum rated RF output power per channel, as declared by the manufacturer RF input signal. The maximum level of intermodulation product shall be not greater than: • -36 dBm (250 nW) in the frequency band 9 kHz to 1 GHz; • -30 dBm (1µW) in the frequency band 1 GHz to 12,75 GHz. 4.2.3.3 Conformance Conformance tests described in clause 5.3.3 shall be carried out. 4.2.4 Out-of-band gain 4.2.4.1 Definition To test the net gain of the repeater outside th

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