SIST EN 300 422 V1.2.1:2003

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.ElectroMagnetic Compatibility and Radio Spectrum Matters (ERM); Technical characteristics and test methods for wireless microphones in the 25 MHz to 3 GHz frequency range33.160.50PriborAccessories33.100.01Elektromagnetna združljivost na splošnoElectromagnetic compatibility in general33.060.99Druga oprema za radijske komunikacijeOther equipment for radiocommunicationsICS:Ta slovenski standard je istoveten z:EN 300 422 Version 1.2.1SIST EN 300 422 V1.2.1:2003en01-december-2003SIST EN 300 422 V1.2.1:2003SLOVENSKI
STANDARD
ETSIETSI EN 300 422 V1.2.1 (1999-07)2ReferenceREN/ERM-RP08-0306 (3wo00ioo.PDF)Keywordsradio, radio mic, testingETSIPostal addressF-06921 Sophia Antipolis Cedex - FRANCEOffice address650 Route des Lucioles - Sophia AntipolisValbonne - FRANCETel.: +33 4 92 94 42 00
Fax: +33 4 93 65 47 16Siret N° 348 623 562 00017 - NAF 742 CAssociation à but non lucratif enregistrée à laSous-Préfecture de Grasse (06) N° 7803/88Internetsecretariat@etsi.frIndividual copies of this ETSI deliverablecan be downloaded fromhttp://www.etsi.orgIf you find errors in the present document, send yourcomment to: editor@etsi.frCopyright NotificationNo 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 1999.All rights reserved.SIST EN 300 422 V1.2.1:2003

ETSIETSI EN 300 422 V1.2.1 (1999-07)3ContentsIntellectual Property Rights.6Foreword.6Introduction.61Scope.82References.93Definitions, symbols and abbreviations.93.1Definitions.93.2Symbols.103.3Abbreviations.104Functional characteristics.114.1Radio microphone descriptions.114.2In ear monitoring.115General.115.1Presentation of equipment for testing purposes.115.1.1Choice of model for type testing.125.1.2Definitions of alignment and switching ranges.125.1.3Definition of the categories of the Alignment Range (AR1 and AR2).125.1.4Choice of frequencies.135.1.5Testing of single channel equipment of category AR1.135.1.6Testing of single channel equipment of category AR2.135.1.7Testing of two channel equipment of category AR1.135.1.8Testing of two channel equipment of category AR2.135.1.9Testing of multi-channel equipment (more than two channels) of category AR1.135.1.10Testing of multi-channel equipment (more than two channels) of category AR2 (switching range lessthan alignment range).145.1.11Testing of multi-channel equipment (more than two channels) of category AR2 (switching rangeequals the alignment range).145.1.12Testing of equipment without a permanent external RF port.145.1.12.1Equipment with a permanent internal RF port.145.1.12.2Equipment with a temporary RF port.145.2Mechanical and electrical design.145.2.1General.145.2.2Limiting threshold.155.2.3Controls.155.2.4Type approval with Integral antenna.155.2.5Marking (equipment identification).155.2.5.1Regulatory marking.165.3Interpretation of the measurement results.166Test conditions, power sources and ambient conditions.166.1Normal and extreme test-conditions.166.2Test power source.166.3Normal test conditions.176.3.1Normal temperature and humidity.176.3.2Normal test power source voltage.176.3.2.1Mains voltage.176.3.2.2Nickel-cadmium cells.176.3.2.3Other power sources.176.4Extreme test conditions.176.4.1Extreme temperatures.176.4.1.1Procedures for tests at extreme temperatures.176.4.2Extreme test power source voltages.18SIST EN 300 422 V1.2.1:2003

ETSIETSI EN 300 422 V1.2.1 (1999-07)46.4.2.1Mains voltage.186.4.2.2Re-chargeable battery power sources.186.4.2.3Power sources using other types of batteries.186.4.2.4Other power sources.187General conditions.197.1Normal test modulation.197.2Artificial antenna.207.3Test fixture.207.4Test site and general arrangements for radiated measurements.207.5Modes of operation of the transmitter.217.6Arrangement for test signals at the input of the transmitter.218Methods of measurement and limits for transmitter parameters.218.1Frequency error.218.1.1Definition.218.1.2Method of measurement.218.1.3Limit.218.2Carrier power.228.2.1Definition.228.2.2Method of measurement for equipment without integral antenna.228.2.3Method of measurement for equipment with integral antenna.228.2.3.1Method of measurement under normal test conditions.228.2.3.2Method of measurement under extreme test conditions.228.2.4Limit.238.3Channel bandwidth.238.3.1Definition.238.3.2Measurement of Necessary Bandwidth (BN).238.3.3Limits.248.4Spurious emissions.258.4.1Definitions.258.4.2Method of measuring the effective radiated power.258.4.3Limits.258.4.4Measuring receiver.259Receiver.269.1Spurious emissions.269.1.1Definitions.269.1.2Method of measuring the power level in a specified load.269.1.3Method of measuring the effective radiated power of the enclosure.269.1.4Method of measuring the effective radiated power.279.1.5Limits.2710Measurement uncertainty.27Annex A (normative):Radiated measurement.28A.1Test sites and general arrangements for measurements involving the use of radiated fields.28A.1.1Outdoor test site.28A.1.1.1Test support for body worn equipment.28A.1.1.2Standard position.29A.1.2Test antenna.29A.1.3Substitution antenna.29A.1.4Optional additional indoor site.30A.2Guidance on the use of radiation test sites.31A.2.1Measuring distance.31A.2.2Test antenna.31A.2.3Substitution antenna.31A.2.4Artificial antenna.31A.2.5Auxiliary cables.31SIST EN 300 422 V1.2.1:2003

ETSIETSI EN 300 422 V1.2.1 (1999-07)5A.3Further optional alternative indoor test site using an anechoic chamber.32A.3.1Example of the construction of a shielded anechoic chamber.32A.3.2Influence of parasitic reflections in anechoic chambers.32A.3.3Calibration of the shielded anechoic chamber.33Annex B (normative):Measurement of Necessary Bandwidth (BN).35Annex C (informative):Graphic representation of the selection of equipment andfrequencies for testing of single and multi-frequency equipment.36History.38SIST EN 300 422 V1.2.1:2003

ETSIETSI EN 300 422 V1.2.1 (1999-07)6Intellectual Property RightsIPRs essential or potentially essential to the present document may have been declared to ETSI. The informationpertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be foundin SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in respectof ETSI standards", which is available free of charge from the ETSI Secretariat. Latest updates are available on theETSI Web server (http://www.etsi.org/ipr).Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guaranteecan be given as to the existence of other IPRs not referenced in SR 000 314 (or the updates on the ETSI Web server)which are, or may be, or may become, essential to the present document.ForewordThis European Standard (Telecommunications series) has been produced by ETSI Technical CommitteeElectromagnetic compatibility and Radio spectrum Matters (ERM).Every EN prepared by ETSI is a voluntary standard. The present document may contain text concerning conformancetesting of the equipment to which it relates. This text should be considered as guidance only and does not make thepresent document mandatory.Annex A provides normative specifications concerning radiated measurements.Annex B describes the test set-up for the measurement of Necessary Bandwidth (BN).Annex C provides a graphic representation of the equipment and frequencies for the testing of single andmulti-frequency equipment.National transposition datesDate of adoption of this EN:18 June 1999Date of latest announcement of this EN (doa):30 September 1999Date of latest publication of new National Standardor endorsement of this EN (dop/e):31 March 2000Date of withdrawal of any conflicting National Standard (dow):31 March 2000IntroductionThe present document is based on the CEPT Recommendation T/R 20-06 [1].This CEPT Recommendation has been a frame that led to many national prescriptions that differed, sometimessubstantially, between European countries. The rapidly increasing quantities of wireless microphones (hereafter referredto as radio microphones) in operation, both legal and illegal, together with the greater mobility of the users, eitherprofessional or private, has led to a serious situation with many occurrences of interference and irregular operation.Legal radio microphones, being fundamentally low power devices, are interfered with more than the generators of theinterference, and suffer primarily from this situation.In preparing the present document, much attention has been given to assure a low interference probability, while at thesame time allowing a maximum flexibility and service to the end-user.SIST EN 300 422 V1.2.1:2003

ETSIETSI EN 300 422 V1.2.1 (1999-07)7The present document provides the necessary parameters for equipment to obtain common approval throughout Europe.It also is intended to make it easier for the frequency management authorities to find harmonized frequency allocations.Common technical specifications and harmonized frequency allocations are expected to reduce greatly the presentproblems of interference and illegal use.The present document is a type testing standard based on spectrum utilization parameters and does not includeperformance characteristics that may be required by the user or requirements for interfacing equipment.The present document is intended to specify the minimum performance and the methods of measurement of RadioMicrophones and In-ear monitoring systems as specified in the scope. In-ear monitoring systems may be tested to eitherthe present document (< 200 kHz max. occupied bandwidth) or to EN 301 357 [9] (< 300 kHz max. occupiedbandwidth) with due consideration of power and operating frequency.Since the initial adoption of I-ETS 300 422 there has been the introduction of further types of equipment - Cordlessheadphones/loudspeakers and consumer In-ear monitoring. These are low power wideband systems that have somecharacteristics in common with radio microphones but are not compatible with multichannel radio microphones. Thisequipment is covered by EN 301 357 [9].The present document also covers radio microphones used in the 863 MHz to 865MHz band, with a maximum power of10 mW.Type test measurements should be performed in one of the accredited test laboratories, accepted by the various nationalregulatory authorities in order to grant type approval, provided the national regulatory requirements are met. This is incompliance with CEPT/ERC Recommendation 01-06 [2] and ERC Decision ERC/DEC(97) 10 [3].In addition, national administrations may accept a "certificate of conformity" based on a type test report. If equipmentavailable on the market is required to be checked, it should be tested in accordance with the methods of measurementspecified in the present document.SIST EN 300 422 V1.2.1:2003

ETSIETSI EN 300 422 V1.2.1 (1999-07)81ScopeThe present document covers the minimum characteristics considered necessary in order to make the best use of theavailable frequencies. It does not necessarily include all the characteristics that may be required by a user, nor does itnecessarily represent the optimum performance achievable.The present document applies to equipment with modulation systems operating on radio frequencies between 25 MHzand 3 GHz. Although analogue Frequency Modulation (FM) is at present used for the majority of radio microphones andother equipment covered by the present document, this specification does not preclude any other constant carriermodulation technique, e.g. Gaussian Filtered Minimum Shift Keying (GMSK) or Generalized Tamed FrequencyModulation (GTFM), provided that the modulation spectrum lies within a standardized spectral mask.The present document does not apply to radio microphones or in ear monitoring equipment employing Time DivisionMultiple Access (TDMA), frequency hopping and spread spectrum or similar forms of modulation.Electromagnetic compatibility (EMC) requirements are covered by ETS 300 445 [8].Additional standards or specifications may be required for equipment intended to interface to the Public SwitchedTelephone Network (PSTN). This facility may be submitted to regulatory conditions.The present document may be used by accredited test laboratories for type testing of the equipment. The performance ofthe equipment submitted for type testing should be representative of the performance of the corresponding productionmodels.The present document contains instructions for the presentation of equipment for type testing purposes.Power limits recommended in the present document have been chosen to allow maximum simultaneous reusage offrequency allocations. National regulations on power output may apply up to the limits quoted below.NOTE:For higher power equipment reference should be made to ETS 300 454 [7] Wide band audio links.Equipmenteffective radiated power (erp)or conductedClass 1Class 2Radio Microphones50 mW2 mWIn ear monitoring10 mW2 mWTour guide systems10 mW2 mWAids for the handicapped10 mW2 mWThe types of equipment covered by the present document are as follows:-professional hand held radio microphones;-professional body worn radio microphones;-in ear monitoring systems;-consumer radio microphones;-tour guide systems;-aids for the handicapped.The classes of equipment given in the present document are as follows:-class 1 equipment would normally be considered as a category requiring an operator licence;-class 2 equipment would be considered in some countries as not requiring an operator licence.SIST EN 300 422 V1.2.1:2003

ETSIETSI EN 300 422 V1.2.1 (1999-07)92ReferencesThe following documents contain provisions which, through reference in this text, constitute provisions of the presentdocument.· References are either specific (identified by date of publication, edition number, version number, etc.) ornon-specific.· For a specific reference, subsequent revisions do not apply.· For a non-specific reference, the latest version applies.· A non-specific reference to an ETS shall also be taken to refer to later versions published as an EN with the samenumber.[1]CEPT Recommendation T/R 20-06 (1977): "Transmitters and receivers for low-power CordlessMicrophone systems".[2]CEPT/ERC Recommendation 01-06: "Procedure for mutual recognition of type testing and typeapproval for radio equipment".[3]CEPT/ERC/DEC(97) 10: "The mutual recognition of conformity assessment procedures includingmarking of radio equipment and radio terminal equipment".[4]ITU-R Recommendation BS.559-2: "Objective measurement of radio-frequency protection ratiosin LF, MF and HF broadcasting".[5]IEC 60244: "Methods of measurement for radio transmitters".[6]ETR 028: "Radio Equipment and Systems (RES); Uncertainties in the measurement of mobileradio equipment characteristics".[7]ETS 300 454 including A1: "Radio Equipment and Systems (RES); Wide band audio links;Technical characteristics and test methods".[8]ETS 300 445 including A1: "Radio Equipment and Systems (RES); ElectroMagnetic Compatibility(EMC) standard for wireless microphones and similar Radio Frequency (RF) audio linkequipment".[9]EN 301 357: "Electromagnetic compatibility and Radio spectrum Matters (ERM); Technicalcharacteristics and test methods for analogue cordless wideband audio devices using integralantennas operating in the CEPT recommended 863 MHz to 865 MHz frequency range".[10]ITU-R Recommendation BS.468-4: "Measurement of audio-frequency noise voltage level in soundbroadcasting".[11]CEPT/ERC Recommendation 70-03 relating to the use of short range devices (SRD).3Definitions, symbols and abbreviations3.1DefinitionsFor the purposes of the present document, the following terms and definitions apply:conducted measurements: measurements that are made using a direct 50 W connection to the EUTintegral antenna: antenna, with or without a connector, designed as, and declared as by the manufacturer, anindispensable part of the equipmentintegral microphone: microphone, designed as, and declared as by the manufacturer, an indispensable fixed part of theequipmentSIST EN 300 422 V1.2.1:2003

ETSIETSI EN 300 422 V1.2.1 (1999-07)10limiter threshold: audio input or output level at which the transmitter audio limiter action may be said to commence. Itis specified with any accessible variable gain controls set according to the manufacturer's instructions, with a sinusoidalinput signal of 500 Hzradiated measurements: measurements that involve the absolute measurement of a radiated electromagnetic fieldcarrier grid: evenly spaced raster in a given frequency band for the allocation of carrier frequencies. The minimumdistance of two carriers in use is a multiple of the raster dependent on type and usage of the equipmentchannel bandwidth: frequency band of defined width (as a multiple of the carrier grid) including safety margin foroperation on adjacent channels, located symmetrically around carrier frequency in the carrier gridport: any connection point on or within the Equipment Under Test (EUT) intended for the connection of cables to orfrom that equipmentRadio Frequency (RF) port: any connection point on or within the EUT intended for the connection of RF cables. RFports are treated as 50 W connection points unless otherwise specified by the manufacturer3.2SymbolsFor the purposes of the present document, the following symbols apply:lwavelength in metresµFmicroFaradµWmicroWattdBcdB relative to the carrier levelEfield strengthEoreference field strength, (see annex A)fccarrier frequencyfooperating frequencyGHzgigaHertzHHenrykHzkiloHertzlimlimitingMHzmegaHertzmWmilliWattnWnanoWattRdistance, (see annex A)Roreference distance, (see annex A)3.3AbbreviationsFor the purposes of the present document, the following abbreviations apply:acalternating currentAR1Alignment Range 1AR2Alignment Range 2Bdeclared channel Bandwidth (see table 1)BNNecessary Bandwidthdcdirect currenterpeffective radiated powerEUTEquipment Under TestGMSKGaussian Filtered Minimum Shift KeyingGTFMGeneralized Tamed Frequency ModulationLFLow FrequencyPSTNPublic Switched Telephone NetworkRBWResolution BandWidthRFRadio FrequencySIST EN 300 422 V1.2.1:2003

ETSIETSI EN 300 422 V1.2.1 (1999-07)11TDMATime Division Multiple AccessTxTransmitterVBWVideo BandWidth4Functional characteristics4.1Radio microphone descriptionsRadio microphones normally use wide band frequency modulation to achieve the necessary audio performance forprofessional use. For the majority of applications the modulated transmitter signal requires a channel bandwidth of200 kHz.The radio part of the transmitter and receiver shall be made up exclusively from equipment that has been approvedaccording to the present document.Other equipment that may be connected to radio microphones shall fulfil the standards applicable to that equipment(if any).4.2In ear monitoringIn ear monitoring equipment is used by stage and studio performers to receive personal fold back (monitoring) of theperformance. This can be just their own voice or a complex mix of sources. The bandwidth requirement of professionalin ear monitoring equipment is similar to those of radio microphones.The radio part of the transmitter and receiver shall be made up exclusively from equipment that has been approvedaccording to the present document.Other equipment that may be connected to in ear monitoring equipment shall fulfil the standards applicable to thatequipment (if any).5General5.1Presentation of equipment for testing purposesEach equipment submitted for type testing shall fulfil the requirements of the present document on all channels overwhich it is intended to operate.The applicant shall complete the appropriate application form when submitting equipment for type testing.For radio microphones that may use a variety of audio capsules the manufacturer shall supply the test sample with anaudio test fixture, to substitute the audio capsule, with suitable input and output impedance.The applicant shall state the channel bandwidth(s) within which the equipment is designed to operate chosen fromtable 1.Table 1: Channel bandwidthDeclared channel Bandwidth (B)Designation50 kHzL75 kHzM100 kHzP150 kHzQ200 kHzRThe applicant shall state the audio input limiting threshold, (see subclause 5.2.2).SIST EN 300 422 V1.2.1:2003

ETSIETSI EN 300 422 V1.2.1 (1999-07)12The applicant shall also supply all relevant interface information to allow:-direct current (dc) power connection;-RF connection;-audio connection;-the limiting of the transmitter; and-the setting of any input audio level controls for normal operation, for a sinusoidal input signal of 500 Hz. Themanufacturer shall specify the settings of any other controls necessary to avoid invalidating the testmeasurements.Besides the technical documentation, the applicant should also supply an operating manual for the device(s).To simplify and harmonize the type testing procedures between the different test laboratories, measurement shall beperformed, according to the present document, on samples of equipment defined in subclauses 5.1.1 to 5.1.12.2.These subclauses are intended to give confidence that the requirements set out in the present document have been metwithout the necessity of performing measurements on all channels.5.1.1Choice of model for type testingThe applicant shall provide one or more production model(s) of the equipment, including all antenna(s) designed for theequipment, and that are required to be covered by the type testing.If type approval is given on the basis of tests on a preliminary model, the corresponding production models shall beidentical in all respects with the preliminary model tested.In the case of radio microphone equipment without a permanent external RF port, see subclause 5.1.12.5.1.2Definitions of alignment and switching rangesThe alignment range is defined as the frequency range over which the receiver and the transmitter can be programmedand/or re-aligned to operate with a single oscillator frequency multiplication, without any physical change ofcomponents other than:-programmable read only memories supplied by the manufacturer or the manufacturer's nominee;-crystals;-frequency setting elements (for the receiver and transmitter). These elements shall not be accessible to the enduser and shall be declared by the applicant in the application form.The switching range is the maximum frequency range over which the receiver or the transmitter can be operated withoutre-programming or realignment.The applicant shall, when submitting equipment for test, state the alignment ranges for the receiver and transmitter. Theapplicant shall also state the switching range of the receiver and the transmitter (which may differ).5.1.3Definition of the categories of the Alignment Range (AR1 and AR2)The alignment range for the receiver and transmitter, which may be different, falls into one of two categories(see annex C for a graphical representation).AR1:this corresponds to a limit of less than or equal to 10 % of the highest frequency of the alignment range,which is equal to or less than 500 MHz, or less than or equal to 5 % where the highest alignment frequency isabove 500 MHz.AR2:this corresponds to a limit of greater than 10 % of the highest frequency of the alignment range, which isequal to or less than 500 MHz, or greater than 5 % where the highest alignment frequency is above 500 MHz.SIST EN 300 422 V1.2.1:2003

ETSIETSI EN 300 422 V1.2.1 (1999-07)135.1.4Choice of frequenciesThe frequencies for testing shall be chosen by the applicant, in accordance with subclauses 5.1.5 to 5.1.11.5.1.5Testing of single channel equipment of category AR1Full tests shall be carried out on a channel within 100 kHz of the centre frequency of the alignment range on one sampleof the equipment.5.1.6Testing of single channel equipment of category AR2Three samples shall be tested. Tests shall be carried out on a total set of three channels as follows:-sample one shall be within 100 kHz of the highest frequency of the alignment range;-sample two shall be within 100 kHz of the lowest frequency of the alignment range;-sample three shall be within 100 kHz of the centre frequency of the alignment range.Full tests shall be carried out on all three channels.5.1.7Testing of two channel equipment of category AR1One sample shall be submitted to enable tests to be carried out on both channels.The frequency of the upper channel shall be within 100 kHz of the highest frequency of the switching range. Thefrequency of the lower channel shall be within 100 kHz of the lowest frequency of the switching range. In addition, theaverage of the frequencies of the two channels shall be within 100 kHz of the centre frequency of the alignment range.Full tests shall be carried out on both channels.5.1.8Testing of two channel equipment of category AR2Three samples of the equipment shall be tested. Tests shall be carried out on a total of four channels.The highest frequency of the switching range of one sample shall be within 100 kHz of the centre frequency of thealignment range. The frequency of the upper channel shall be within 100 kHz of the highest frequency of the switchingrange and the frequency of the lower channel shall be within 100 kHz of the lowest frequency of the switching range.Full tests shall be carried out on both channels.The frequency of one of the channels of the second sample shall be within 100 kHz of the highest frequency of thealignment range.Full tests shall be carried out on this channel.The frequency of one of the channels of the third sample shall be within 100 kHz of the lowest frequency of thealignment range.Full tests shall be carried out on this channel.5.1.9Testing of multi-channel equipment (more than two channels) ofcategory AR1One sample of the equipment shall be submitted to enable tests to be carried out on three channels. The centre frequencyof the switching range of the sample shall correspond to the centre frequency of the alignment range.Full tests shall be carried out on a frequency within 100 kHz of the centre, lowest and highest frequencies of theswitching range.SIST EN 300 422 V1.2.1:2003

ETSIETSI EN 300 422 V1.2.1 (1999-07)145.1.10Testing of multi-channel equipment (more than two channels) ofcategory AR2 (switching range less than alignment range)Three samples of the equipment shall be tested. Tests shall be carried out on a total of five channels.The centre frequency of the switching range of one sample shall be within 100 kHz of the centre frequency of thealignment range. The frequency of the upper channel shall be within 100 kHz of the highest frequency of the switchingrange and the frequency of the lower channel shall be within 100 kHz of the lowest frequency of the switching range.Full tests shall be carried out on the centre channel, spurious emission tests only on the upper and lower channels.The frequency of one of the channels of the second sample shall be within 100 kHz of the highest frequency of thealignment range.Full tests shall be carried out on this channel.The frequency of one of the channels of the third sample shall be within 100 kHz of the lowest frequency of thealignment range.Full tests shall be carried out on this channel.5.1.11Testing of multi-channel equipment (more than two channels) ofcategory AR2 (switching range equals the alignment range)One sample shall be submitted to enable tests to be carried out on three channels.The centre frequency of the switching range of the sample shall correspond to the centre frequency of the alignmentrange.Full tests shall be carried out on a frequency within 100 kHz of the centre frequency of the switching range and within100 kHz of the lowest and also within 100 kHz of the highest frequency of the switching range.5.1.12Testing of equipment without a permanent external RF portTo facilitate relative measurements, use may be made of a test fixture as described in subclause 7.3, or the equipmentmay be supplied with a permanent internal or temporary internal/external RF port.5.1.12.1Equipment with a permanent internal RF portThe way to access a permanent internal RF port shall be stated by the applicant with the aid of a diagram. The fact thatuse has been made of a permanent internal RF port shall be recorded in the test report.5.1.12.2Equipment with a temporary RF portThe applicant shall submit two sets of equipment to the test laboratory, one fitted with a temporary 50 W RF connectorwith the antenna disconnected and the other with the antenna connected. Each equipment shall be used for theappropriate tests.The way the temporary RF port is implemented shall be stated by the applicant with the aid of a diagram. The fact thatuse has been made of the temporary RF port to facilitate measurements shall be stated in the test report. The addition ofa temporary RF port should not influence the performance of the EUT.5.2Mechanical and electrical design5.2.1GeneralThe equipment submitted by the applicant shall be designed, constructed and manufactured in accordance with soundengineering practice, and with the aim of minimizing harmful interference to other equipment and services.SIST EN 300 422 V1.2.1:2003

ETSIETSI EN 300 422 V1.2.1 (1999-07)155.2.2Limiting thresholdThe limiting threshold is defined as the minimum audio input level at which the slope of the audio input/output transfercurve, with the levels expressed in dB, is greater or equal to 4:1 (see figure 1). For non-linear or companded systems,this point is determined with a complimentary audio decoding module connected to the test demodulator. Themeasurement is made at 500 Hz with any user accessible gain controls set according to the manufacturer's instructions.The measurement is made with a quasi peak meter to ITU-R Recommendation BS.468-4 [10] in the flat (unweighted)condition._ _ _ _ _ | | | | | +10 0 -10 -20 -30 -30
-20
-10
0 dB(lim)
+10 dB (Arbitrary reference) Audio output level fromcomplimentaryaudio decodingcircuitsAudio input level to transmitter (dB relative to limiting threshold) Slope = 4:1 Slope = 1:1 Figure 1: Determination of audio input limiting thresholdIn the case of a transmitter designed for acoustical input only, with an integral microphone and no limiter, a soundpressure of 128 dB relative to 20 mPa is regarded as the limiting threshold.5.2.3ControlsThose controls that, if maladjusted, might increase the interfering potentialities of the equipment shall only be accessibleby partial or complete disassembly of the device and requiring the use of tools.5.2.4Type approval with Integral antennaType approval of equipment with integral antenna only applies to that equipment together with the antenna originallysupplied by the manufacturer for type testing.5.2.5Marking (equipment identification)The equipment shall be marked in a visible place. This marking shall be legible, tamper-proof and durable.The marking shall include:-the name of the manufacturer or his trade mark;-the type designation of the manufacturer;-serial number;-operational frequency range;-national and/or international type approval;-modulation type.SIST EN 300 422 V1.2.1:2003

ETSIETSI EN 300 422 V1.2.1 (1999-07)16Alternatively the marking shall consist of:-a normally readable label; and-the information detailed above, stored electronically in a secure format, which is easily readable by either:-the receiver provided by the manufacturer; or-a reading system provided by the manufacturer with each transmitter.5.2.5.1Regulatory markingThe equipment shall be marked, where applicable, in accordance with CEPT/ERC Recommendation 70-03 [11]. Wherethis is not applicable the equipment shall be marked in accordance with national regulatory requirements.5.3Interpretation of the measurement resultsThe interpretation of the results recorded in the appropriate test report for the measurements described in the presentdocument shall be as follows:-the measured value related to the corresponding limit shall be used to decide whether an equipment meets therequirements of the present document;-the measurement uncertainty value for th
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