SIST ETS 300 135:1998

Radio Equipment and Systems (RES); Angle-modulated Citizens Band radio equipment (CEPT PR 27 Radio Equipment); Technical characteristics and methods of measurement

DE/RES-02-BA

Radijska oprema in sistemi (RES) - CB oprema s kotno modulacijo (CEPT PR 27 Radijska oprema) - Tehnične značilnosti in merilne metode

General Information

• Status: Withdrawn
• Publication Date: 30-Sep-1998
• Withdrawal Date: 24-Feb-2015
• ICS: 33.060.99 - Other equipment for radiocommunications
• Technical Committee: RES - Radio equipment and systems
• Current Stage: 9900 - Withdrawal (Adopted Project)
• Start Date: 04-Feb-2015
• Due Date: 27-Feb-2015
• Completion Date: 25-Feb-2015
• Ref Project: ETSI ETS 300 135 ed.1 (1991-06) - Radio Equipment and Systems (RES); Angle-modulated Citizens Band radio equipment (CEPT PR 27 Radio Equipment); Technical characteristics and methods of measurement

Standards Content (Sample)

SLOVENSKI STANDARD
SIST ETS 300 135:1998
01-oktober-1998
5DGLMVNDRSUHPDLQVLVWHPL5(6&%RSUHPDVNRWQRPRGXODFLMR&(3735
5DGLMVNDRSUHPD7HKQLþQH]QDþLOQRVWLLQPHULOQHPHWRGH
Radio Equipment and Systems (RES); Angle-modulated Citizens Band radio equipment
(CEPT PR 27 Radio Equipment); Technical characteristics and methods of measurement
Ta slovenski standard je istoveten z: ETS 300 135 Edition 1
ICS:
33.060.99 Druga oprema za radijske Other equipment for
komunikacije radiocommunications
SIST ETS 300 135:1998 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST ETS 300 135:1998

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SIST ETS 300 135:1998
EUROPEAN ETS 300 135
TELECOMMUNICATION June 1991
STANDARD
Source: ETSI TC-RES Reference:
ICS: 33.060.20
radio, citizens' band
Key words:
Radio Equipment and Systems;
Angle-modulated Citizens’ Band radio equipment
(CEPT PR 27 Radio Equipment)
Technical characteristics and methods of measurement
ETSI
European Telecommunications Standards Institute
ETSI Secretariat
Postal address: F-06921 Sophia Antipolis CEDEX - FRANCE
Office address: 650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE
X.400: c=fr, a=atlas, p=etsi, s=secretariat - Internet: [e-mail]
Tel.: [phone] - Fax: [phone]
Copyright Notification: No part may be reproduced except as authorized by written permission. The copyright and the
foregoing restriction extend to reproduction in all media.
© European Telecommunications Standards Institute 1991. All rights reserved.
New presentation - see History box

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ETS 300 135: June 1991
Whilst every care has been taken in the preparation and publication of this document, errors in content,
typographical or otherwise, may occur. If you have comments concerning its accuracy, please write to
"ETSI Editing and Committee Support Dept." at the address shown on the title page.

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ETS 300 135: June 1991
Contents
Foreword .7
Introduction.7
1 Scope .9
2 Normative references.9
3 Definition, abbreviations and symbols.9
3.1 Definitions .9
3.2 Abbreviations .10
3.3 Symbols .10
4 General.10
4.1 Presentation of equipment for testing purposes .10
4.2 Mechanical and electrical design.10
4.2.1 General.10
4.2.2 Controls .11
4.2.3 Marking.11
4.3 Interpretation of the measurement results.11
5 Technical characteristics.11
5.1 Common characteristics .11
5.1.1 Frequency band.11
5.1.2 Carrier frequencies and channel numbers.12
5.1.3 Channel separation .12
5.1.4 Multi-channel equipment .13
5.1.5 Type of modulation.13
5.1.6 Push-to-talk (ptt) and voice activated switch.13
5.1.7 Controls .13
5.1.8 Combination with other equipment.13
5.2 Transmitter parameter limits.13
5.2.1 Frequency error.13
5.2.2 Power .13
5.2.3 Frequency deviation .13
5.2.4 Unwanted amplitude modulation.14
5.2.5 Adjacent channel power .14
5.2.6 Spurious emissions of the transmitter.14
5.2.7 Transient frequency behaviour of the transmitter.15
5.2.8 Synthesisers and Phase Locked Loop (PLL) systems.15
5.3 Receiver parameter limits.16
5.3.1 Maximum usable sensitivity.16
5.3.2 Adjacent channel selectivity .16
5.3.3 Intermodulation response rejection .16
5.3.4 Spurious radiations.16
6 Test conditions, power sources and ambient temperatures .17
6.1 Normal and extreme test conditions .17
6.2 Test power source .17
6.3 Normal test conditions .17
6.3.1 Normal temperature and humidity.17
6.3.2 Normal test power source .17
6.3.2.1 Mains voltage and frequency.17
6.3.2.2 Regulated lead-acid battery power sources on vehicles .17
6.3.2.3 Other power sources .17
6.4 Extreme test conditions .18
6.4.1 Extreme temperatures.18

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ETS 300 135: June 1991
6.4.2 Extreme test source voltages . 18
6.4.2.1 Mains voltage. 18
6.4.2.2 Regulated lead-acid battery power sources on vehicles. 18
6.4.2.3 Power sources using other types of battery. 18
6.4.2.4 Other power sources. 18
6.5 Procedure for tests at extreme temperatures . 18
6.5.1 Test procedure. 18
7 General conditions. 19
7.1 Arrangements for test signals applied to the receiver input . 19
7.2 Receiver mute or squelch facility. 19
7.3 Receiver rated audio output power . 19
7.4 Normal test modulation . 19
7.5 Artificial antenna. 19
7.6 Test fixture . 19
7.7 Arrangement for test signals at the input of the transmitter . 20
7.8 Test site and general arrangements for radiated measurements . 20
8 Method of measurement for transmitter parameters. 20
8.1 Frequency error. 20
8.1.1 Definition. 20
8.1.2 Method of measurement. 20
8.2 Transmitter carrier power. 20
8.2.1 Definition. 20
8.2.2 Method of measurement (for equipment other than equipment with
integral antenna only) . 20
8.2.3 Method of measurement for equipment with integral antenna . 20
8.3 Maximum frequency deviation . 21
8.3.1 Maximum permissible frequency deviation. 21
8.3.1.1 Definition . 21
8.3.1.2 Method of measurement. 21
8.4 Unwanted amplitude modulation. 21
8.4.1 Method of measurement. 21
8.5 Adjacent channel power. 22
8.5.1 Definition. 22
8.5.2 Method of measurement. 22
8.6 Spurious emissions . 22
8.6.1 Definition. 22
8.6.2 Method of measuring the power level in a specified load, subclause 8.6.1
(a) . 22
8.6.3 Method of measuring the effective radiated power, subclause 8.6.1 (b). 23
8.6.4 Method of measuring the effective radiated power, subclause 8.6.1 (c) . 24
8.7 Transient frequency behaviour of the transmitter. 24
8.7.1 Definitions . 24
8.7.2 Method of measurement. 24
9 Methods of measurement for receiver parameters . 27
9.1 Maximum usable sensitivity. 27
9.1.1 Definition. 27
9.1.2 Method of measuring the SND/ND ratio . 27
9.2 Adjacent channel selectivity . 27
9.2.1 Definition. 27
9.2.2 Method of measurement. 27
9.3 Intermodulation response rejection. 28
9.3.1 Definition. 28
9.3.2 Method of measurement. 28
9.4 Spurious radiations. 28
9.4.1 Definition. 28
9.4.2 Method of measuring the power level in a specified load, subclause 9.4.1
(a) . 29
9.4.3 Method of measuring the effective radiated power, subclause 9.4.1 (b). 29
9.4.4 Method of measuring the effective radiated power, subclause 9.4.1 (c) . 29

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10 Measurement uncertainty.30
Annex A: Radiated measurement.31
A.1 Test sites and general arrangements for measurements involving the use of radiated fields .31
A.1.1 Outdoor test site.31
A.1.1.2 Test site for handportable stations .31
A.1.2 Test antenna.32
A.1.3 Substitution antenna .32
A.1.4 Optional additional indoor site.32
A.2 Guidance on the use of radiation test sites .33
A.2.1 Measuring distance.33
A.2.2 Test antenna.33
A.2.3 Substitution antenna .34
A.2.4 Artificial antenna .34
A.2.5 Auxiliary cables .34
A.3 Further optional alternative indoor test site using an anechoic chamber .34
A.3.1 Example of the construction of a shielded anechoic chamber .34
A.3.2 Influence of parasitic reflections in anechoic chambers .35
A.3.3 Calibration of the shielded anechoic chamber.35
Annex B: Specification for adjacent channel power measurement arrangements.37
B.1 Power measuring receiver specification.37
B.1.1 IF filter.37
B.1.2 Variable attenuator.38
B.1.3 Rms value indicator .38
B.1.4 Oscillator and amplifier .38
History.39

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ETS 300 135: June 1991
Foreword
This European Telecommunication Standard (ETS) has been prepared by an Experts' Group of the Radio
Equipment and Systems (RES) Technical Committee of the European Telecommunications Standards
Institute (ETSI). The standard has undergone the formal ETSI approval process and is now adopted.
This ETS concerns only angle modulation. The existing national Citizens' Band standards or specifications
which also permit the use of other forms of modulation (including amplitude and single sideband) will not be
affected by the adoption of this ETS.
This standard is based upon CEPT Recommendation T/R 20-02 [1], originally prepared by the CEPT R22
Committee for use by Citizens' Band (CB) radio equipment.
Angle modulation shall be used for radio equipment covered by this standard, with an audio pre-emphasis
characteristic for the transmitter, and audio de-emphasis for the receiver.
Administrative arrangements (e.g. for type approval, marking, antennas), and conditions for the use of CB
angle modulated radio (CEPT PR 27) are to be found in CEPT Recommendations T/R 20-02 and T/R 20-07
[2].
Every ETS prepared by ETSI is a voluntary standard. This ETS contains text concerning type approval of the
equipment to which it relates. This text should be considered only as guidance and does not make this ETS
mandatory.
Introduction
This standard is intended to specify the minimum performance and the methods of measurement of Citizens'
Band radio equipment (CEPT PR 27) as specified in the Scope.
Clause 5 provides the corresponding limits. These limits have been chosen to ensure an acceptable grade of
service and to minimise harmful interference to other equipment and services.
This standard will also be used by European notified accredited test laboratories for the assessment of the
performance of the equipment. In order to avoid any ambiguity in that assessment, this standard contains
instructions for the presentation of equipment for type testing purposes (Clause 4), measurement methods
(Clauses 8 and 9) and conditions (Clauses 6 and 7).
This standard was drafted on the assumption that:
a) the type test measurements would be performed only once in one of the accredited test laboratories, and
then accepted by the various authorities in order to obtain type approval;
b) if equipment available on the market is required to be checked it shall be tested in accordance with the
methods specified in this standard. This standard covers base stations, mobile stations and two
categories of hand-portable stations.

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1 Scope
This standard covers the minimum characteristics considered necessary in order to make the best use of the
available frequencies. It does not necessarily include all the characteristics which may be required by a user,
nor does it necessarily represent the optimum performance achievable. It applies to angle modulated
Citizens' Band radio equipment (CEPT PR 27) operation in the frequency band 26.960 MHz to 27.410 MHz
with channel separations of 10 kHz, and intended for analogue speech.
This standard applies to equipment with a socket for an external antenna and to equipment with an integral
antenna.
In the case of equipment which is intended for use with either an integral antenna or an external antenna, the
equipment shall be measured as equipment intended for use with an external antenna and shall meet the
appropriate limits. In addition to this, the transmitter characteristics:
- transmitter carrier power,
- spurious emissions of the transmitter,
and the receiver characteristic:
- spurious radiations of the receiver,
shall be measured as for equipment for use with an integral antenna and the appropriate limits shall be met.
2 Normative references
[1] CEPT Recommendation T/R 20-02 (1972, with subsequent amendments): "Low-
power radio transmitter-receivers intended to provide voice radiocommunications in
the 27 MHz band (PR 27 Radio Equipment)"
[2] CEPT Recommendation T/R 20-07 (1982, with subsequent amendment): "Free
circulation for use in different countries, of low-power mobile and portable
transmitter-receivers in the 27 MHz band (PR 27 equipment Recommendation T/R
20-02)"
[3] CCITT Recommendation O.41 (1988): "Psophometer for use on the telephone-type
circuits"
[4] CCITT Recommendation T/R 20-09 (1990): "PR27 radio equipment intended to
provide short-range voice radiocommuniation in the 27 MHz band"
3 Definition, abbreviations and symbols
3.1 Definitions
For the purpose of this standard the following definitions apply.
Base station
Equipment fitted with an antenna socket, for use with an external antenna, and intended for use in a fixed
location.
Mobile station
Mobile equipment fitted with an antenna socket, for use with an external antenna, normally used in a vehicle
or as a transportable station.

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SIST ETS 300 135:1998
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ETS 300 135: June 1991
Handportable station
Equipment either fitted with an antenna socket or an integral antenna, or both, normally used on a stand-
alone basis, to be carried on a person or held in the hand.
Integral antenna
An antenna designed to be connected to the equipment without the use of a 50 ohm external connector and
considered to be part of the equipment. An integral antenna may be fitted internally or externally to the
equipment.
Angle modulation
Angle modulation with an audio pre-emphasis characteristic for the transmitter and an audio de-emphasis
characteristic for the receiver.
3.2 Abbreviations
SND/ND (signal + noise + distortion)/(noise + distortion)
dBc dB relative to the carrier power
RF radio frequency
IF intermediate frequency
Tx transmitter
Rx receiver
3.3 Symbols
Eo reference field strength, annex A
Ro reference distance, annex A
4 General
4.1 Presentation of equipment for testing purposes
a) The manufacturer shall provide a production model of the equipment for type approval testing. If type
approval is given on the basis of tests on a preliminary model, the corresponding production models shall
be identical in all respects with the preliminary model tested;
b) Tests shall be carried out on the highest and lowest channel within the switching range of the equipment
and on a channel near the middle of the switching range. The switching range of the receiver and
transmitter shall be declared by the manufacturer. The switching range is the maximum frequency range
over which the receiver or the transmitter can be operated without reprogramming or realignment.In the
case of equipment fitted with one channel only, all tests are carried out on that channel.
In the case of equipment fitted with two channels, all tests are carried out on both channels.
4.2 Mechanical and electrical design
4.2.1 General
The equipment submitted by the manufacturer or his representative, shall be designed, constructed and
manufactured in accordance with sound engineering practice, and with the aim to minimise harmful
interference to other equipment and services.

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ETS 300 135: June 1991
4.2.2 Controls
Those controls which if maladjusted might increase the interfering potentialities of the equipment shall not be
accessible to the user.
4.2.3 Marking
The equipment shall be marked in a visible place. This marking shall be legible, tamperproof and durable.
The marking shall include:
a) the name of the manufacturer or his trade mark;
b) the type number of designation and serial number;
c) the type approval number (when allocated by appropriate authorities);
d) the type approval mark as stated in CEPT Recommendations T/R 20-07 [2] and T/R 20-09 [4].
4.3 Interpretation of the measurement results
The interpretation of the results recorded in a test report when making the measurements described in this
standard shall be as follows:
a) the measured value related to the corresponding limit will be used to decide whether an equipment
meets the minimum requirements of the standard;
b) the inclusion in the test report of the actual measurement uncertainty for each particular measurement is
also required;
c) the values, of the actual measurement uncertainty shall be, for each measurement, equal to or lower
than the figures in Clause 10 (table of measurement uncertainty).
NOTE: This procedure for using the Maximum Acceptable Uncertainty Value is valid until
superseded by other publications of ETSI covering this subject.
The use of the measured value for comparison with the limit value has been chosen
because there is no definitive standard for specifying the measurement uncertainty
agreed at the time of publication of this standard. Therefore the measurement uncertainty
shall be used as a quality measure of the actual measurement. The use of the
Measurement Uncertainty values shall be used by Accreditation Authorities during their
accreditation procedures to ensure compliance/conformity with the requirements of type
testing to ETSI Standards.
5 Technical characteristics
5.1 Common characteristics
5.1.1 Frequency band
The maximum operating frequency band shall be from 26.960 MHz to 27.410 MHz. Equipment may operate
on one or more channels up to a maximum of 40 channels.

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ETS 300 135: June 1991
5.1.2 Carrier frequencies and channel numbers.
The following carrier frequencies are available.
Carrier Channel Carrier Channel
frequencies Number frequencies Number
26.965 Mhz 1 27.215 MHz 21
26.975 Mhz 2 27.225 MHz 22
26.985 Mhz 3 27.235 MHz 24
27.005 Mhz 4 27.245 MHz 25
27.015 Mhz 5 27.255 MHz 23
27.025 Mhz 6 27.265 MHz 26
27.035 Mhz 7 27.275 MHz 27
27.055 Mhz 8 27.285 MHz 28
27.065 Mhz 9 27.295 MHz 29
27.075 Mhz 10 27.305 MHz 30
27.085 Mhz 11 27.315 MHz 31
27.105 Mhz 12 27.325 MHz 32
27.115 Mhz 13 27.335 MHz 33
27.125 Mhz 14 27.345 MHz 34
27.135 Mhz 15 27.355 MHz 35
27.155 Mhz 16 27.365 MHz 36
27.165 Mhz 17 27.375 MHz 37
27.175 Mhz 18 27.385 MHz 38
27.185 Mhz 19 27.395 MHz 39
27.205 Mhz 20 27.405 MHz 40
Transmission and reception shall take place on the same channel (single frequency simplex mode).
5.1.3 Channel separation
The channel separation shall be 10 kHz.

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5.1.4 Multi-channel equipment
Multi-channel equipment may be used, provided that such equipment is only designed for the channels
indicated in subclause 5.1.2.
Precautions shall be taken against extension of the usable frequency range by the user. For instance the
physical and electrical design of the channel switching system shall permit operation in not more than the
channels indicated in subclause 5.1.2.
If for the determining of the transmitter frequency use is made of a synthesizer and/or of a phase locked loop
(PLL) system, arbitrary input codes shall only lead to the channels indicated in subclause 5.1.2.
5.1.5 Type of modulation
Only angle modulation with appropriate pre-emphasis and de-emphasis shall be used.
5.1.6 Push-to-talk (ptt) and voice activated s
...

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Radio Equipment and Systems (RES); Angle-modulated Citizens Band radio equipment (CEPT PR 27 Radio Equipment); Technical characteristics and methods of measurement33.060.99Druga oprema za radijske komunikacijeOther equipment for radiocommunicationsICS:Ta slovenski standard je istoveten z:ETS 300 135 Edition 13SIST ETS 300 135:1998en01-DYJXVW-19983SIST ETS 300 135:1998SLOVENSKI
STANDARD



SIST ETS 300 135:1998



EUROPEANETS 300 135TELECOMMUNICATIONJune 1991STANDARDSource: ETSI TC-RESReference:ICS:33.060.20Key words:radio, citizens' bandRadio Equipment and Systems;Angle-modulated Citizens’ Band radio equipment(CEPT PR 27 Radio Equipment)Technical characteristics and methods of measurementETSIEuropean Telecommunications Standards InstituteETSI SecretariatPostal address: F-06921 Sophia Antipolis CEDEX - FRANCEOffice address: 650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCEX.400: c=fr, a=atlas, p=etsi, s=secretariat - Internet: [e-mail].: [phone] - Fax: [phone]Copyright Notification: No part may be reproduced except as authorized by written permission. The copyright and theforegoing restriction extend to reproduction in all media.© European Telecommunications Standards Institute 1991. All rights reserved.SIST ETS 300 135:1998



Page 2ETS 300 135: June 1991Whilst every care has been taken in the preparation and publication of this document, errors in content,typographical or otherwise, may occur. If you have comments concerning its accuracy, please write to"ETSI Editing and Committee Support Dept." at the address shown on the title page.SIST ETS 300 135:1998



Page 3ETS 300 135: June 1991ContentsForeword.7Introduction.71 Scope.92Normative references.93Definition, abbreviations and symbols.93.1Definitions.93.2Abbreviations.103.3Symbols.104General.104.1Presentation of equipment for testing purposes.104.2Mechanical and electrical design.104.2.1General.104.2.2Controls.114.2.3Marking.114.3Interpretation of the measurement results.115Technical characteristics.115.1Common characteristics.115.1.1Frequency band.115.1.2Carrier frequencies and channel numbers.125.1.3Channel separation.125.1.4Multi-channel equipment.135.1.5Type of modulation.135.1.6Push-to-talk (ptt) and voice activated switch.135.1.7Controls.135.1.8Combination with other equipment.135.2Transmitter parameter limits.135.2.1Frequency error.135.2.2Power.135.2.3Frequency deviation.135.2.4Unwanted amplitude modulation.145.2.5Adjacent channel power.145.2.6Spurious emissions of the transmitter.145.2.7Transient frequency behaviour of the transmitter.155.2.8Synthesisers and Phase Locked Loop (PLL) systems.155.3Receiver parameter limits.165.3.1Maximum usable sensitivity.165.3.2Adjacent channel selectivity.165.3.3Intermodulation response rejection.165.3.4Spurious radiations.166Test conditions, power sources and ambient temperatures.176.1Normal and extreme test conditions.176.2Test power source.176.3Normal test conditions.176.3.1Normal temperature and humidity.176.3.2Normal test power source.176.3.2.1Mains voltage and frequency.176.3.2.2Regulated lead-acid battery power sources on vehicles.176.3.2.3Other power sources.176.4Extreme test conditions.186.4.1Extreme temperatures.18SIST ETS 300 135:1998



Page 4ETS 300 135: June 19916.4.2Extreme test source voltages.186.4.2.1Mains voltage.186.4.2.2Regulated lead-acid battery power sources on vehicles.186.4.2.3Power sources using other types of battery.186.4.2.4Other power sources.186.5Procedure for tests at extreme temperatures.186.5.1Test procedure.187General conditions.197.1Arrangements for test signals applied to the receiver input.197.2Receiver mute or squelch facility.197.3Receiver rated audio output power.197.4Normal test modulation.197.5Artificial antenna.197.6Test fixture.197.7Arrangement for test signals at the input of the transmitter.207.8Test site and general arrangements for radiated measurements.208Method of measurement for transmitter parameters.208.1Frequency error.208.1.1Definition.208.1.2Method of measurement.208.2Transmitter carrier power.208.2.1Definition.208.2.2Method of measurement (for equipment other than equipment withintegral antenna only).208.2.3Method of measurement for equipment with integral antenna.208.3Maximum frequency deviation.218.3.1Maximum permissible frequency deviation.218.3.1.1Definition.218.3.1.2Method of measurement.218.4Unwanted amplitude modulation.218.4.1Method of measurement.218.5Adjacent channel power.228.5.1Definition.228.5.2Method of measurement.228.6Spurious emissions.228.6.1Definition.228.6.2Method of measuring the power level in a specified load, subclause 8.6.1(a).228.6.3Method of measuring the effective radiated power, subclause 8.6.1 (b).238.6.4Method of measuring the effective radiated power, subclause 8.6.1 (c).248.7Transient frequency behaviour of the transmitter.248.7.1Definitions.248.7.2Method of measurement.249Methods of measurement for receiver parameters.279.1Maximum usable sensitivity.279.1.1Definition.279.1.2Method of measuring the SND/ND ratio.279.2Adjacent channel selectivity.279.2.1Definition.279.2.2Method of measurement.279.3Intermodulation response rejection.289.3.1Definition.289.3.2Method of measurement.289.4Spurious radiations.289.4.1Definition.289.4.2Method of measuring the power level in a specified load, subclause 9.4.1(a).299.4.3Method of measuring the effective radiated power, subclause 9.4.1 (b).299.4.4Method of measuring the effective radiated power, subclause 9.4.1 (c).29SIST ETS 300 135:1998



Page 5ETS 300 135: June 199110Measurement uncertainty.30Annex A:Radiated measurement.31A.1Test sites and general arrangements for measurements involving the use of radiated fields.31A.1.1Outdoor test site.31A.1.1.2Test site for handportable stations.31A.1.2Test antenna.32A.1.3Substitution antenna.32A.1.4Optional additional indoor site.32A.2Guidance on the use of radiation test sites.33A.2.1Measuring distance.33A.2.2Test antenna.33A.2.3Substitution antenna.34A.2.4Artificial antenna.34A.2.5Auxiliary cables.34A.3Further optional alternative indoor test site using an anechoic chamber.34A.3.1Example of the construction of a shielded anechoic chamber.34A.3.2Influence of parasitic reflections in anechoic chambers.35A.3.3Calibration of the shielded anechoic chamber.35Annex B:Specification for adjacent channel power measurement arrangements.37B.1Power measuring receiver specification.37B.1.1IF filter.37B.1.2Variable attenuator.38B.1.3Rms value indicator.38B.1.4Oscillator and amplifier.38History.39SIST ETS 300 135:1998



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Page 7ETS 300 135: June 1991ForewordThis European Telecommunication Standard (ETS) has been prepared by an Experts' Group of the RadioEquipment and Systems (RES) Technical Committee of the European Telecommunications StandardsInstitute (ETSI).
The standard has undergone the formal ETSI approval process and is now adopted.This ETS concerns only angle modulation. The existing national Citizens' Band standards or specificationswhich also permit the use of other forms of modulation (including amplitude and single sideband) will not beaffected by the adoption of this ETS.This standard is based upon CEPT Recommendation T/R 20-02 [1], originally prepared by the CEPT R22Committee for use by Citizens' Band (CB) radio equipment.Angle modulation shall be used for radio equipment covered by this standard, with an audio pre-emphasischaracteristic for the transmitter, and audio de-emphasis for the receiver.Administrative arrangements (e.g. for type approval, marking, antennas), and conditions for the use of CBangle modulated radio (CEPT PR 27) are to be found in CEPT Recommendations T/R 20-02 and T/R 20-07[2].Every ETS prepared by ETSI is a voluntary standard.
This ETS contains text concerning type approval of theequipment to which it relates.
This text should be considered only as guidance and does not make this ETSmandatory.IntroductionThis standard is intended to specify the minimum performance and the methods of measurement of Citizens'Band radio equipment (CEPT PR 27) as specified in the Scope.Clause 5 provides the corresponding limits. These limits have been chosen to ensure an acceptable grade ofservice and to minimise harmful interference to other equipment and services.This standard will also be used by European notified accredited test laboratories for the assessment of theperformance of the equipment. In order to avoid any ambiguity in that assessment, this standard containsinstructions for the presentation of equipment for type testing purposes (Clause 4), measurement methods(Clauses 8 and 9) and conditions (Clauses 6 and 7).This standard was drafted on the assumption that:a)the type test measurements would be performed only once in one of the accredited test laboratories, andthen accepted by the various authorities in order to obtain type approval;b)if equipment available on the market is required to be checked it shall be tested in accordance with themethods specified in this standard. This standard covers base stations, mobile stations and twocategories of hand-portable stations.SIST ETS 300 135:1998



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Page 9ETS 300 135: June 19911 ScopeThis standard covers the minimum characteristics considered necessary in order to make the best use of theavailable frequencies. It does not necessarily include all the characteristics which may be required by a user,nor does it necessarily represent the optimum performance achievable. It applies to angle modulatedCitizens' Band radio equipment (CEPT PR 27) operation in the frequency band 26.960 MHz to 27.410 MHzwith channel separations of 10 kHz, and intended for analogue speech.This standard applies to equipment with a socket for an external antenna and to equipment with an integralantenna.In the case of equipment which is intended for use with either an integral antenna or an external antenna, theequipment shall be measured as equipment intended for use with an external antenna and shall meet theappropriate limits. In addition to this, the transmitter characteristics:-transmitter carrier power,-spurious emissions of the transmitter,and the receiver characteristic:-spurious radiations of the receiver,shall be measured as for equipment for use with an integral antenna and the appropriate limits shall be met.2Normative references[1]CEPT Recommendation T/R 20-02 (1972, with subsequent amendments): "Low-power radio transmitter-receivers intended to provide voice radiocommunications inthe 27 MHz band (PR 27 Radio Equipment)"[2] CEPT Recommendation T/R 20-07 (1982, with subsequent amendment): "Freecirculation for use in different countries, of low-power mobile and portabletransmitter-receivers in the 27 MHz band (PR 27 equipment Recommendation T/R20-02)"[3]CCITT Recommendation O.41 (1988): "Psophometer for use on the telephone-typecircuits"[4]CCITT Recommendation T/R 20-09 (1990): "PR27 radio equipment intended toprovide short-range voice radiocommuniation in the 27 MHz band"3Definition, abbreviations and symbols3.1DefinitionsFor the purpose of this standard the following definitions apply.Base stationEquipment fitted with an antenna socket, for use with an external antenna, and intended for use in a fixedlocation.Mobile stationMobile equipment fitted with an antenna socket, for use with an external antenna, normally used in a vehicleor as a transportable station.SIST ETS 300 135:1998



Page 10ETS 300 135: June 1991Handportable stationEquipment either fitted with an antenna socket or an integral antenna, or both, normally used on a stand-alone basis, to be carried on a person or held in the hand.Integral antennaAn antenna designed to be connected to the equipment without the use of a 50 ohm external connector andconsidered to be part of the equipment. An integral antenna may be fitted internally or externally to theequipment.Angle modulationAngle modulation with an audio pre-emphasis characteristic for the transmitter and an audio de-emphasischaracteristic for the receiver.3.2AbbreviationsSND/ND(signal + noise + distortion)/(noise + distortion)dBcdB relative to the carrier powerRFradio frequencyIFintermediate frequencyTxtransmitterRxreceiver3.3SymbolsEoreference field strength, annex ARoreference distance, annex A4General4.1Presentation of equipment for testing purposesa)The manufacturer shall provide a production model of the equipment for type approval testing. If typeapproval is given on the basis of tests on a preliminary model, the corresponding production models shallbe identical in all respects with the preliminary model tested;b)Tests shall be carried out on the highest and lowest channel within the switching range of the equipmentand on a channel near the middle of the switching range. The switching range of the receiver andtransmitter shall be declared by the manufacturer. The switching range is the maximum frequency rangeover which the receiver or the transmitter can be operated without reprogramming or realignment.In thecase of equipment fitted with one channel only, all tests are carried out on that channel.In the case of equipment fitted with two channels, all tests are carried out on both channels.4.2Mechanical and electrical design4.2.1GeneralThe equipment submitted by the manufacturer or his representative, shall be designed, constructed andmanufactured in accordance with sound engineering practice, and with the aim to minimise harmfulinterference to other equipment and services.SIST ETS 300 135:1998



Page 11ETS 300 135: June 19914.2.2ControlsThose controls which if maladjusted might increase the interfering potentialities of the equipment shall not beaccessible to the user.4.2.3MarkingThe equipment shall be marked in a visible place. This marking shall be legible, tamperproof and durable.The marking shall include:a)the name of the manufacturer or his trade mark;b)the type number of designation and serial number;c)the type approval number (when allocated by appropriate authorities);d)the type approval mark as stated in CEPT Recommendations T/R 20-07 [2] and T/R 20-09 [4].4.3Interpretation of the measurement resultsThe interpretation of the results recorded in a test report when making the measurements described in thisstandard shall be as follows:a)the measured value related to the corresponding limit will be used to decide whether an equipmentmeets the minimum requirements of the standard;b)the inclusion in the test report of the actual measurement uncertainty for each particular measurement isalso required;c)the values, of the actual measurement uncertainty shall be, for each measurement, equal to or lowerthan the figures in Clause 10 (table of measurement uncertainty).NOTE:This procedure for using the Maximum Acceptable Uncertainty Value is valid untilsuperseded by other publications of ETSI covering this subject.The use of the measured value for comparison with the limit value has been chosenbecause there is no definitive standard for specifying the measurement uncertaintyagreed at the time of publication of this standard. Therefore the measurement uncertaintyshall be used as a quality measure of the actual measurement. The use of theMeasurement Uncertainty values shall be used by Accreditation Authorities during theiraccreditation procedures to ensure compliance/conformity with the requirements of typetesting to ETSI Standards.5Technical characteristics5.1Common characteristics5.1.1Frequency bandThe maximum operating frequency band shall be from 26.960 MHz to 27.410 MHz. Equipment may operateon one or more channels up to a maximum of 40 channels.SIST ETS 300 135:1998



Page 12ETS 300 135: June 19915.1.2Carrier frequencies and channel numbers.The following carrier frequencies are available.CarrierfrequenciesChannelNumberCarrierfrequenciesChannelNumber26.965 Mhz127.215 MHz2126.975 Mhz227.225 MHz2226.985 Mhz327.235 MHz2427.005 Mhz427.245 MHz2527.015 Mhz527.255 MHz2327.025 Mhz627.265 MHz2627.035 Mhz727.275 MHz2727.055 Mhz827.285 MHz2827.065 Mhz927.295 MHz2927.075 Mhz1027.305 MHz3027.085 Mhz1127.315 MHz3127.105 Mhz1227.325 MHz3227.115 Mhz1327.335 MHz3327.125 Mhz1427.345 MHz3427.135 Mhz1527.355 MHz3527.155 Mhz1627.365 MHz3627.165 Mhz1727.375 MHz3727.175 Mhz1827.385 MHz3827.185 Mhz1927.395 MHz3927.205 Mhz2027.405 MHz40Transmission and reception shall take place on the same channel (single frequency simplex mode).5.1.3Channel separationThe channel separation shall be 10 kHz.SIST ETS 300 135:1998



Page 13ETS 300 135: June 19915.1.4Multi-channel equipmentMulti-channel equipment may be used, provided that such equipment is only designed for the channelsindicated in subclause 5.1.2.Precautions shall be taken against extension of the usable frequency range by the user. For instance thephysical and electrical design of the channel switching system shall permit operation in not more than thechannels indicated in subclause 5.1.2.If for the determining of the transmitter frequency use is made of a synthesizer and/or of a phase locked loop(PLL) system, arbitrary input codes shall only lead to the channels indicated in subclause 5.1.2.5.1.5Type of modulationOnly angle modulation with appropriate pre-emphasis and de-emphasis shall be used.5.1.6Push-to-talk (ptt) and voice activated switchSwitching between the transmit and receive mode of operation shall only be possible by means of a non-locking ptt switch or by means of a non-locking voice activated switch.If a voice activated switch is used it shall not respond to ambient acoustic noise. The noise threshold leveladjustment shall not be accessible to the user.5.1.7ControlsThose controls which, if maladjusted, increase the risk of interference or improper functioning of thetransceiver, shall not be immediately accessible to the user.5.1.8Combination with other equipmentThe equipment shall not be combined with any other form of transmitting or receiving equipment. Theequipment shall not be provided with any terminals or other connection points, internal or external, formodulating sources other than those required for either a separate or a built-in microphone, or for selectivecalling devices.Terminals or other connecting points are permitted for the connection of external devices that shall notmodulate the transmitters (e.g. a voice synthesiser device to give an aural indication of channel).Equipment fitted with a selective calling device shall meet the requirements of subclause 5.2.6 for transmitterconducted and radiated spurious emissions with the device in operation.5.2Transmitter parameter limits5.2.1Frequency errorFor the definition and the measuring method see subclause 8.1. The frequency error shall not exceed 0.6kHz.5.2.2PowerFor the definition and the measuring method see subclause 8.2. Both the transmitter carrier power, and theeffective radiated power of an equipment with an integral antenna, shall not exceed 4 watts. The equipmentshall be constructed in such a way that an increase of output power cannot easily be ac
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