1、 ETSI EN 302 245-1 V1.1.1 (2005-01)European Standard (Telecommunications series) Electromagnetic compatibilityand Radio spectrum Matters (ERM);Transmitting equipment for the Digital Radio Mondiale (DRM)broadcasting service;Part 1: Technical characteristics and test methodsETSI ETSI EN 302 245-1 V1.1
2、.1 (2005-01) 2 Reference DEN/ERM-TG17WG2-001-1 Keywords audio, broadcasting, digital, DRM, radio, terrestrial, transmitter 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 but non lucr
3、atif enregistre la Sous-Prfecture de Grasse (06) N 7803/88 Important notice Individual copies of the present document can be downloaded from: http:/www.etsi.org The present document may be made available in more than one electronic version or in print. In any case of existing or perceived difference
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6、.etsi.org/chaircor/ETSI_support.asp 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 2005. All rights reserved. DECTTM, PLUGTES
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8、rtners. ETSI ETSI EN 302 245-1 V1.1.1 (2005-01) 3 Contents Intellectual Property Rights5 Foreword.5 Introduction 5 1 Scope 6 2 References 6 3 Definitions, symbols and abbreviations .6 3.1 Definitions6 3.2 Symbols8 3.3 Abbreviations .8 4 Technical requirements specifications .8 4.1 Environmental prof
9、ile.8 4.2 Transmitter output characteristics 9 4.2.1 Rated output power.9 4.2.1.1 Definition 9 4.2.1.2 Method of measurement9 4.2.1.2.1 Initial conditions9 4.2.1.2.2 Procedure.9 4.2.1.2.3 Test requirements 9 4.2.1.3 Limit9 4.2.2 Frequency stability9 4.2.2.1 Definition 9 4.2.2.2 Method of measurement
10、10 4.2.2.2.1 Initial conditions10 4.2.2.2.2 Procedure.10 4.2.2.2.3 Test requirements 10 4.2.2.3 Limit10 4.3 Digital signal processing 10 4.3.1 Modulation Error Ratio (MER) 10 4.3.1.1 Definition 10 4.3.1.2 Method of measurement11 4.3.1.3 Limit11 4.4 Antenna port measurements .11 4.4.1 Spurious emissi
11、ons .11 4.4.1.1 Definition 11 4.4.1.2 Method of measurement (essential test suite) .11 4.4.1.2.1 Initial conditions11 4.4.1.2.2 Procedure.12 4.4.1.2.3 Test requirements 12 4.4.1.3 Limit12 4.4.2 Transmitter muting during frequency shift .13 4.4.2.1 Definition 13 4.4.2.2 Method of measurement (essenti
12、al test suite) .13 4.4.2.2.1 Initial conditions13 4.4.2.2.2 Procedure.14 4.4.2.2.3 Test requirements 14 4.4.2.3 Limit14 4.4.3 Out-of-band emissions14 4.4.3.1 Definition 14 4.4.3.2 Method of measurement (essential test suite) .14 4.4.3.2.1 Initial conditions14 4.4.3.2.2 Procedure.14 4.4.3.2.3 Test re
13、quirements 14 4.4.3.3 Limit14 ETSI ETSI EN 302 245-1 V1.1.1 (2005-01) 4 4.5 Enclosure port measurements (radiated emissions)16 4.5.1 Cabinet radiation.16 4.5.1.1 Definition 16 4.5.1.2 Method of measurement (essential test suite) .16 4.5.1.2.1 Initial conditions16 4.5.1.2.2 Procedure.17 4.5.1.2.3 Tes
14、t requirements 17 4.5.1.3 Limits 17 4.6 Measurement uncertainties.18 Annex A (normative): Typical measuring arrangements.19 A.1 Testing arrangements for antenna port (and MER) measurements 19 A.1.1 Testing arrangement .19 A.1.2 Test frequency range (antenna port measurements) .20 A.1.3 Test modulati
15、ng signal .20 Annex B (normative): Test load characteristics21 Annex C (informative): Bibliography.22 History 23 ETSI ETSI EN 302 245-1 V1.1.1 (2005-01) 5 Intellectual Property Rights IPRs essential or potentially essential to the present document may have been declared to ETSI. The information pert
16、aining 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 Secret
17、ariat. Latest updates are available on the ETSI Web server (http:/webapp.etsi.org/IPR/home.asp). 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
18、the updates on the ETSI Web server) which are, or may be, or may become, essential to the present document. Foreword This European Standard (Telecommunications series) has been produced by ETSI Technical Committee Electromagnetic compatibility and Radio spectrum Matters (ERM). The present document i
19、s part 1 of a multi-part deliverable covering the Transmitting equipment for the Digital Radio Mondiale (DRM) broadcasting service, as identified below: Part 1: “Technical characteristics and test methods“; Part 2: “Harmonized EN under article 3.2 of the R - EN 301 489-11 2. ETSI ETSI EN 302 245-1 V
20、1.1.1 (2005-01) 6 1 Scope The present document covers the following types of equipment: Transmitting equipment for the Digital Radio Mondiale (DRM) sound broadcasting service operating in the LF, MF and HF bands. 2 References The following documents contain provisions which, through reference in thi
21、s text, constitute provisions of the present document. References are either specific (identified by date of publication and/or edition number or version number) or non-specific. For a specific reference, subsequent revisions do not apply. For a non-specific reference, the latest version applies. Re
22、ferenced documents which are not found to be publicly available in the expected location might be found at http:/docbox.etsi.org/Reference. 1 ETSI EN 302 245-2: “Electromagnetic compatibility and Radio spectrum Matters (ERM); Transmitting equipment for the Digital Radio Mondiale (DRM) broadcasting s
23、ervice; Part 2: Harmonized EN under article 3.2 of the R ElectroMagnetic Compatibility (EMC) standard for radio equipment and services; Part 11: Specific conditions for terrestrial sound broadcasting service transmitters“. 3 CENELEC EN 55022: “Limits and methods of measurement of radio disturbance c
24、haracteristics of information technology equipment“. 4 CENELEC EN 55011: “Industrial, scientific and medical (ISM) radio-frequency equipment - Radio disturbance characteristics - Limits and methods of measurement“. 5 ETSI TR 100 028 series: “Electromagnetic compatibility and Radio spectrum Matters (
25、ERM); Uncertainties in the measurement of mobile radio equipment characteristics“. 3 Definitions, symbols and abbreviations 3.1 Definitions For the purposes of the present document, the following terms and definitions apply: amplitude imbalance: error caused by different amplification of the I and Q
26、 signals antenna port: port of an apparatus which is designed, in normal operation, to be connected to an antenna using coaxial cable broadcasting service: radiocommunication service in which the transmissions are intended for direct reception by the general public NOTE: This service may include sou
27、nd transmissions, television transmissions or other types of transmission. cabinet radiation: radiation from an enclosure containing, equipment, excluding radiation from connected antennas or cables ETSI ETSI EN 302 245-1 V1.1.1 (2005-01) 7 channel bandwidth: frequency band of defined width (as a mu
28、ltiple of the carrier grid) including safety margin for operation on adjacent channels, located symmetrically around a carrier frequency in the carrier grid class of emission: set of characteristics of an emission, designated by standard symbols NOTE: Type of modulation of the main carrier, modulati
29、ng signal, type of information to be transmitted, and also, if appropriate, any additional signal characteristics. dBc: decibels relative to the unmodulated carrier power of the emission NOTE: In the cases which do not have a carrier, for example in some digital modulation schemes where the carrier
30、is not accessible for measurement, the reference level equivalent to dBc is decibels relative to the mean power P. enclosure port: physical boundary of the apparatus through which electromagnetic fields may radiate or impinge NOTE: In the case of integral antenna equipment, this port is inseparable
31、from the antenna port. environmental profile: range of environmental conditions under which equipment within the scope of EN 302 245-1 is required to comply with the provisions of EN 302 245-1 harmonic: component of order greater than 1 of the Fourier series of a periodic quantity harmonic number: i
32、ntegral number given by the ratio of the frequency of a harmonic to the fundamental frequency NOTE: 2ndharmonic = 2 fundamental frequency. intermodulation products: unwanted frequencies resulting from intermodulation between carriers or harmonics of emission, or between any oscillations generated to
33、 produce the carrier mean power: average power supplied to the antenna port by a transmitter during an interval of time sufficiently long compared with the lowest frequency encountered in the modulation envelope taken under normal operating conditions multiplex: stream of all the digital data carryi
34、ng one or more services within a single physical channel necessary bandwidth: for a given class of emission, the width of the frequency band which is sufficient to ensure the transmission of information at the rate and with the quality required under specified conditions out-of-band emissions: emiss
35、ion on a frequency or frequencies immediately outside the necessary bandwidth which results from the modulation process, but excluding spurious emissions quadrature error: error caused by phase shift between the I and Q signals reference bandwidth: bandwidth in which the emission level is specified
36、RMS power: apparent power of an AC power that is calculated by multiplying root-mean-square (rms) current by the root mean square voltage NOTE 1: In a purely resistive circuit this is held to be the equivalent heating effect of a DC power and can be deemed to be true power. In a circuit that consist
37、s of reactance as well as resistance the apparent power is greater than the true power (the vector difference between true power and apparent power is called reactive power). True Power = Vrms (Irms cos ) Where cos is the phase difference between voltage and current introduced by the reactance of th
38、e load. NOTE 2: From the above definition it becomes clear that unless any measuring system can be completely devoid of reactance then the measured power cannot be considered to be RMS power. It therefore becomes apparent that this parameter would be difficult to measure with any degree of accuracy
39、at RF frequencies. ETSI ETSI EN 302 245-1 V1.1.1 (2005-01) 8 spurious emissions: emission on a frequency or frequencies which are outside the necessary bandwidth and the level of which may be reduced without affecting the corresponding transmission of information NOTE: Spurious emissions include har
40、monic emissions, parasitic emissions, intermodulation products and frequency conversion products but exclude out-of-band emissions. unwanted emissions: spurious emissions and out-of-band emissions 3.2 Symbols For the purposes of the present document, the following symbol applies: micro 3.3 Abbreviat
41、ions For the purposes of the present document, the following abbreviations apply: AI Amplitude Imbalance dB Decibel, logarithmic ratio (tenths of a “Bel“) dBm dB relative to one milliwatt COFDM Coded Orthogonal Frequency Division Multiplex DRM Digital Radio Mondiale EMC Electro-Magnetic Compatibilit
42、y EN European Norm EUT Equipment Under Test HF High Frequency I In-phase component of a signal ITU International Telecommunications Union LF Low Frequency LV Low VoltageMER Modulation Error Ratio MF Medium Frequency N Noise power OFDM Orthogonal Frequency Division Multiplex Q Quadrature phase compon
43、ent of a signal QE Quadrature Error R 2) the highest operating frequency of the EUT; 3) a frequency mid-way between 1) and 2) above. Test arrangement (see figure A.1): 1) all ports unused at the time of testing shall be correctly terminated; 2) connect the EUT to the test load, via the coupling devi
44、ce or via the attenuator; 3) connect the measuring device to the coupling device or attenuator. 4.2.1.2.2 Procedure The power of the signal of a DRM transmitter is defined as the long-term average of the time-varying short-term signal power. An appropriate instrument for low power DRM transmitters i
45、s a thermal power meter; for high power DRM transmitters a calorimetric method may be used. 4.2.1.2.3 Test requirements The results obtained shall be compared to the limits in clause 4.2.1.3 in order to demonstrate compliance. 4.2.1.3 Limit The mean output power shall be within 10 % of the rated out
46、put power under normal operating conditions as defined by the manufacturer. 4.2.2 Frequency stability 4.2.2.1 Definition The frequency stability of an emission is the variation of frequency against a predetermined time scale. ETSI ETSI EN 302 245-1 V1.1.1 (2005-01) 104.2.2.2 Method of measurement 4.
47、2.2.2.1 Initial conditions Test environment: - the normal operating environment, as declared by the equipment manufacturer. Test frequencies: - one frequency within the tuning range of the EUT. Test arrangement (see figure A.1): 1) all ports unused at the time of testing shall be correctly terminate
48、d; 2) connect the EUT to the test load, via the coupling device or via the attenuator; 3) connect the measuring device to the coupling device or attenuator. NOTE: Alternatively the transmitter local oscillator may be measured in order to calculate the frequency stability of the EUT RF output signal.
49、 4.2.2.2.2 Procedure The characteristic frequency may be measured with any suitable measuring device, provided that the accuracy attained during the measurement is better than approximately 10 % of the frequency tolerance of the frequency stability specified in clause 4.2.2.3. For a tight frequency tolerance or a high degree of frequency stability, the measuring accuracy stated above puts higher demands on the accuracy of the measuring equipment. Other methods of great precision use a standard reference frequency, the frequency of which is known w
