1、 ETSI EN 302 245-2 V1.1.1 (2005-01)Candidate Harmonized European Standard (Telecommunications series) Electromagnetic compatibilityand Radio spectrum Matters (ERM);Transmitting equipment for the Digital Radio Mondiale (DRM)broadcasting service;Part 2: Harmonized EN under article 3.2of the R Essentia
2、l, 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 (http:/webapp.etsi.org/IPR/home.asp). Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has bee
3、n 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 Candidate Harmonized European Standard (Telecommunication
4、s series) has been produced by ETSI Technical Committee Electromagnetic compatibility and Radio spectrum Matters (ERM). The present document has been produced by ETSI in response to a mandate from the European Commission issued under Council Directive 98/34/EC 1 (as amended) laying down a procedure
5、for the provision of information in the field of technical standards and regulations. The present document is intended to become a Harmonized Standard, the reference of which will be published in the Official Journal of the European Communities referencing the Directive 1999/5/EC 2 of the European P
6、arliament and of the Council of 9 March 1999 on radio equipment and telecommunications terminal equipment and the mutual recognition of their conformity (“the R Part 2: “Harmonized EN under article 3.2 of the R it provides scope for standards to be added: - under article 3.2 when new frequency bands
7、 are agreed; or - under article 3.3 should the Commission take the necessary decisions without requiring alteration of standards that are already published; it clarifies, simplifies and promotes the usage of Harmonized Standards as the relevant means of conformity assessment. Other document directly
8、 associated with the present document: EN 302 245-1 5; EN 301 489-11 6. ETSI ETSI EN 302 245-2 V1.1.1 (2005-01) 8 1 Scope The present document applies to Transmitting equipment for the Digital Radio Mondiale (DRM) broadcasting service. The types of equipment covered by the present document are as fo
9、llows: Transmitting equipment for the Digital Radio Mondiale broadcasting service operating in the harmonized LF, MF and HF terrestrial sound broadcasting bands. The present document is intended to cover the provisions of article 3.2, of Directive 1999/5/EC 2 (R Transmitting equipment for the Digita
10、l Radio Mondiale (DRM) broadcasting service; Part 1: Technical characteristics and test methods“. 6 ETSI EN 301 489-11 (V1.2.1): “Electromagnetic compatibility and Radio spectrum Matters (ERM); ElectroMagnetic Compatibility (EMC) standard for radio equipment and services; Part 11: Specific condition
11、s for terrestrial sound broadcasting service transmitters“. 7 CENELEC EN 55022 (1998): “Limits and methods of measurement of radio disturbance characteristics of information technology equipment“. 8 CENELEC EN 55011 (1998): “Industrial, scientific and medical (ISM) radio-frequency equipment - Radio
12、disturbance characteristics - Limits and methods of measurement“. ETSI ETSI EN 302 245-2 V1.1.1 (2005-01) 9 9 ETSI TR 100 028 series (V1.4.1): “Electromagnetic compatibility and Radio spectrum Matters (ERM); Uncertainties in the measurement of mobile radio equipment characteristics“. 3 Definitions,
13、symbols and abbreviations 3.1 Definitions For the purposes of the present document, the following terms and definitions apply: 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
14、 in which the transmissions are intended for direct reception by the general public NOTE: This service may include sound transmissions, television transmissions or other types of transmission cabinet radiation: radiation from an enclosure containing, equipment, excluding radiation from connected ant
15、ennas or cables channel bandwidth: frequency band of defined width (as a multiple 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
16、 by standard symbols NOTE: Type of modulation of the main carrier, modulating 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
17、 carrier, for example in some digital modulation schemes where the carrier 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
18、 NOTE: In the case of integral antenna equipment, this port is inseparable from the antenna port. environmental profile: range of environmental conditions under which equipment within the scope of EN 302 245-2 is required to comply with the provisions of EN 302 245-2 harmonic: component of order gre
19、ater than 1 of the Fourier series of a periodic quantity harmonic number: integral 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 c
20、arriers or harmonics of emission, or between any oscillations generated to 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 no
21、rmal operating conditions 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: emission on a frequency or frequenci
22、es immediately outside the necessary bandwidth which results from the modulation process, but excluding spurious emissions reference bandwidth: bandwidth in which the emission levels are specified ETSI ETSI EN 302 245-2 V1.1.1 (2005-01) 10spurious emissions: emission on a frequency or frequencies wh
23、ich are outside the necessary bandwidth and the level of which may be reduced without affecting the corresponding transmission of information NOTE: Spurious emissions include harmonic emissions, parasitic emissions, intermodulation products and frequency conversion products but exclude out of band e
24、missions. unwanted emissions: spurious emissions and out of band emissions 3.2 Symbols For the purposes of the present document, the following symbol applies: micro (10-6) 3.3 Abbreviations For the purposes of the present document, the following abbreviations apply: dB Decibel, logarithmic ratio (te
25、nths of a “Bel“) dBm dB relative to one milliwatt COFDM Coded Orthogonal Frequency Division Multiplex DRM Digital Radio Mondiale EMC Electro-Magnetic Compatibility EUT Equipment Under Test HF High Frequency LF Low FrequencyLV Low Voltage MF Medium Frequency RF Radio Frequency R 2) the highest operat
26、ing 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 device; 3) connect the measuring device to the coupling device
27、(a filter may be used to attenuate the wanted signal). 4.2.1.2.2 Procedure 1) Operate the EUT at each of the test frequencies as defined in clause 4.2.1.2.1. 2) Measure the results on the spectrum analyser. 4.2.1.2.3 Test requirements The results obtained shall be compared to the limits in clause 4.
28、2.1.3 in order to demonstrate compliance. 4.2.1.3 Limit Spurious emissions shall not exceed the values set out in table 4.1 and additionally figure 4.1 for the frequency range 9kHz to 1 GHz. NOTE: In the case of a DRM transmitter supplied without an internal band-pass output filter, the manufacturer
29、 shall specify the characteristics of the filter necessary to fulfil the spurious emission limits defined in table 4.1. The manufacturer shall include this information in their test report. Table 4.1: Spurious emission limits Mean power of the transmitter Limits Mean power absolute levels (dBm) or r
30、elative levels (dBc) below the mean power supplied to the antenna port in the reference bandwidth (see annex A) All power ranges -50 dBc, without exceeding the absolute mean power of 50 mW (17 dBm) ETSI ETSI EN 302 245-2 V1.1.1 (2005-01) 12-50-60-70-80-90Mean power of the transmitter30 40 50 60 70 8
31、0 90 dBm1 W 10 W 100 W 1 kW 10 kW 100 kW 1 MW2,5 5 25 50 250 500 2,5 5 250 50025 5050mW(17dBm)9 kHz to 1 GHzdBcRatio ofspuriousemission tomean powerFigure 4.1: Spurious emission limits for DRM transmitters 4.2.2 Transmitter muting during frequency shift 4.2.2.1 Definition The suppression of emission
32、s during the re-tuning of transmitters. 4.2.2.2 Method of measurement (essential test suite) 4.2.2.2.1 Initial conditions Test environment: - the normal operating environment, as declared by the equipment manufacturer. Test frequencies: - present frequency to desired frequency. Test arrangement (see
33、 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 device; 3) connect the measuring device to the coupling device. ETSI ETSI EN 302 245-2 V1.1.1 (2005-01) 134.2.2.2.2 Procedure 1) Operate the EUT at the presen
34、t frequency. 2) Initiate frequency change. 3) Observe the output signal on an oscilloscope. 4.2.2.2.3 Test requirements The results obtained shall be compared to the limits in clause 4.2.2.3 in order to demonstrate compliance. 4.2.2.3 Limit The muting shall be as defined in clause 4.2.1.3. 4.2.3 Out
35、-of-band emissions 4.2.3.1 Definition Out-of-band emissions are defined as any emission on a frequency or frequencies immediately outside the necessary bandwidth which results from the modulation process, but excluding spurious emissions. For the purposes of the present document the out-of-band regi
36、on shall extend to 500 % of the necessary bandwidth. 4.2.3.2 Method of measurement (essential test suite) 4.2.3.2.1 Initial conditions Test environment: - the normal operating environment, as declared by the equipment manufacturer. Test frequencies: 1) the lowest operating frequency of the EUT; 2) t
37、he highest operating frequency of the EUT; 3) a frequency mid-way between 1) and 2) above. Test arrangement (see figure A.1). 4.2.3.2.2 Procedure 1) All ports unused at the time of testing shall be correctly terminated. 2) Operate the EUT at each of the test frequencies as defined in clause 4.2.2.2.
38、1. 3) Measure the results on the spectrum analyser. 4.2.3.2.3 Test requirements The results obtained shall be compared to the limits in clause 4.2.3.3 in order to demonstrate compliance. 4.2.3.3 Limit Out-of-band emissions shall not exceed the limits specified in table 4.2. Additionally the limits s
39、hown in figure 4.2 on a linear frequency axis and in figure 4.3 on a logarithmic axis. Out-of-band emissions limits in table 4.2 are given as relative levels measured in a 100 Hz bandwidth, where the 0 dB reference level corresponds to the mean output power measured in the same bandwidth. ETSI ETSI
40、EN 302 245-2 V1.1.1 (2005-01) 14In figures 4.2 and 4.3 the additionally 0 dBc reference level corresponds to the mean output power measured in the channel bandwidth. NOTE 1: The figure 4.3 is only a additional representation of the limits given in table 4.2. It is not representative of the output of
41、 a spectrum analyser. The slope outside 0,53 F is -12 dB per octave until the value of -60dB is reached. NOTE 2: In the case of a DRM transmitter supplied without an internal band-pass output filter, the manufacturer shall specify the characteristics of the filter necessary to fulfil the spurious em
42、ission limits defined in table 4.1. The manufacturer shall include this information in their test report. Table 4.2: Out-of-band emission limits Relative frequency (f/F) Frequency difference (f) from the centre frequency at different channel bandwidths (F) (kHz) Relative level dB F=4,5 F=5 F=9 F=10
43、F=18 F=20 0,10 0,45 0,50 0,90 1,00 1,80 2,00 0,00 0,50 2,25 2,50 4,50 5,00 9,00 10,00 0,00 0,53 2,39 2,65 4,77 5,30 9,54 10,60 -30,00 1,06 4,77 5,30 9,54 10,60 19,08 21,20 -42,04 2,12 9,54 10,60 19,08 21,20 38,16 42,40 -54,08 2,98 13,41 14,90 26,82 29,80 53,64 59,60 -60,00 230 MHz to 1 GHz NOTE: P0=
44、 RF output power in W. NOTE 1: The measurements can be carried out at other distances. In that case limits are modified according to the relation: L(x) = L(10m) + 20 log (10/x) where x = distance in meter (m). NOTE 2: Care should be taken if measuring at test distances below 10 m as this may be in t
45、he near field. NOTE 3: In cases of dispute the measurement distance of 10 m shall take precedence. ETSI ETSI EN 302 245-2 V1.1.1 (2005-01) 17dBV/m7060504030Mean power of the transmitter30 40 50 60 70 80 90 dBm1 W 10 W 100 W 1 kW 10 kW 100 kW 1 MW2,5 5 25 50 250 500 2,5 5 250 50025 5030 MHz to 230 MH
46、z 230 MHz to 1 GHz80Figure 4.4: Cabinet radiation for DRM transmitters 4.4 Measurement uncertainties Measurement uncertainty should be calculated and techniques employed to minimize its range. This uncertainty should be applied to the limit and any measurement falling below the range is deemed accep
47、table (see TR 100 028 series 9). ETSI ETSI EN 302 245-2 V1.1.1 (2005-01) 18Annex A (normative): General measuring arrangements A.1 Testing arrangements for antenna port and enclosure port measurements A.1.1 Testing arrangement DRM transmitterPower AmplifierOutputFilterCOFDM ExciterInput SignalPower
48、meter /Spectrum AnalyserCoupling DeviceTestLoadFilter(s)(see note 1)AttenuatorRF OutputABCA1C1B1Measuring Receiver/Spectrum AnalyserNOTE 1: The optional filter should suppress the output signal so that no intermodulation products are generated by the spectrum analyser. The insertion loss throughout
49、the measuring range should be known. NOTE 2: For high power transmitters the preferred set up would require A to be connected to B and A1 to be connected to B1. NOTE 3: For low power transmitters the preferred set up would require A to be connected to C and A1 to be connected to C1. NOTE 4: For enclosure port measurements the “Measuring Receiver/Spectrum Analyser“ is used to measure the results. NOTE 5: In the case of a DRM transmitter supplied without an internal band-pass output filter, the manufacturer shall specify the characteristics of the f
