1、 ETSI EN 302 296 V1.1.1 (2005-01)Candidate Harmonized European Standard (Telecommunications series) Electromagnetic compatibilityand Radio spectrum Matters (ERM);Transmitting equipment forthe digital television broadcast service,Terrestrial (DVB-T);Harmonized EN under article 3.2of the R Essential,
2、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 been c
3、arried 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 (Telecommunications s
4、eries) 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 for
5、 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 Parl
6、iament and of the Council of 9 March 1999 on radio equipment and telecommunications terminal equipment and the mutual recognition of their conformity (“the R it provides scope for standards to be added: - under article 3.2 when new frequency bands are agreed; or - under article 3.3 should the Commis
7、sion 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 associated with the present document: EN 301 489-14
8、5. ETSI ETSI EN 302 296 V1.1.1 (2005-01)7 1 Scope The present document applies to transmitting equipment for the terrestrial digital television broadcasting service. The types of equipment covered by the present document are as follows: Transmitting equipment for digital television broadcasting serv
9、ice, with 7 MHz and 8 MHz RF channel bandwidths, operating in the CEPT frequency bands. These frequencies are currently within the television Bands III, IV and V. The present document is intended to cover the provisions of article 3.2 of Directive 1999/5/EC 2 (R ElectroMagnetic Compatibility (EMC) s
10、tandard for radio equipment and services; Part 14: Specific conditions for analogue and digital terrestrial TV broadcasting service transmitters“. 6 ETSI EN 300 744 (V1.4.1): “Digital Video Broadcasting (DVB); Framing structure, channel coding and modulation for digital terrestrial television“. 7 CE
11、NELEC EN 55022 (1998): “Information technology equipment - Radio disturbance characteristics - Limits and methods of measurement“. ETSI ETSI EN 302 296 V1.1.1 (2005-01)8 8 CENELEC EN 55011 (1998): “Industrial, scientific and medical (ISM) radio-frequency equipment - Radio disturbance characteristics
12、 - Limits and methods of measurement“. 9 IEC 60489-1 + Am1 (1996) + Am2 (1999): “Methods of measurement for radio equipment used in the mobile services. Part 1: General definitions and standard conditions of measurement“. 10 ETSI TR 100 028 (all parts): “Electromagnetic compatibility and Radio spect
13、rum Matters (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: antenna port: port of an apparatus which is designed, in norma
14、l 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 sound transmissions, television transmissions or other types of transmissi
15、on. cabinet radiation: radiation from an enclosure containing, equipment, excluding radiation from connected antennas or cables carrier power: average power supplied to the antenna port by a transmitter during one radio frequency cycle taken under the condition of no modulation class of emission: se
16、t of characteristics of an emission, designated by standard symbols, e.g. 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 e
17、mission NOTE: In the cases which do not have a 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. digital signal: discretely timed signal in which information is
18、represented by a finite number of well defined discrete values that its characteristic quantities may take in time digital television: television in which all information is represented by a digital signal enclosure port: physical boundary of the apparatus through which electromagnetic fields may ra
19、diate or impinge 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 302 296 is required to comply with the provisions EN 302 296 effective radiated powe
20、r: product of the power supplied to the antenna and it gain relative to a half wave dipole in a given direction exclusion band: band of radio frequencies where no measurements are made harmonic: component of order greater than 1 of the Fourier series of a periodic quantity harmonic number: integral
21、number given by the ratio of the frequency of a harmonic to the fundamental frequency (2ndharmonic = 2 fundamental frequency) intermodulation products: unwanted frequencies resulting from intermodulation between carriers or harmonics of emission, or between any oscillations generated to produce the
22、carrier ETSI ETSI EN 302 296 V1.1.1 (2005-01)9 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 taken under normal operating conditions necessary bandwidth: for a give
23、n 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 frequencies immediately outside the necessary bandwidth which resu
24、lts from the modulation process, but excluding spurious emissions rated output power: power that the transmitter or transposer shall deliver at its output under specified conditions of operation reference bandwidth: bandwidth in which the emission level is specified spurious emissions: emission on a
25、 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 harmonic emissions, parasitic emissions, intermodulation products and frequency conversion produc
26、ts but exclude out-of-band emissions. unwanted emissions: consist of spurious emissions and out-of-band emissions 3.2 Symbols For the purposes of the present document, the following symbols apply: Micro 3.3 Abbreviations For the purposes of the present document, the following abbreviations apply: dB
27、 logarithmic ratio (tenths of a “Bel“) dBm dB relative to one milliwatt DVB-T Digital Video Broadcasting - Terrestrial EMC ElectroMagnetic CompatibilityEUT Equipment Under Test GHz Giga Hertz kHz kilo Hertz LV Low Voltagem metres MHz Mega Hertz QAM Quadrature Amplitude Modulation R 2) the highest op
28、erating frequency of the EUT; 3) a frequency mid-way between 1) and 2) above. Test arrangement (see figure A.1): 1) connect the EUT to the test load, via the coupling device; 2) connect the spectrum analyser to the coupling device. For the purposes of this test no test signal is required, the manufa
29、cturer shall ensure that the full rated output power of the transmitter will be maintained during this test. 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
30、 obtained shall be compared to the limits in clause 4.2.1.3 in order to demonstrate compliance. 4.2.1.3 Limit Spurious emissions shall not exceed the values set out in table 4.1 additionally shown in figures 4.1 and 4.2, for the frequency range 9 kHz to 4,5 GHz. NOTE: In the case of a DVB-T transmit
31、ter supplied without an internal bandpass output filter, the manufacturer 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. ETSI ETSI EN 302 296 V1.1.1 (2005-01)
32、11Table 4.1: Spurious emission limits for DVB-T transmitters Frequency range of the spurious emission Limits of the spurious emission Reference bandwidth Figure 9 kHz to 174 MHz -36 dBm (250 nW) 100 kHz 4.1 174 MHz to 400 MHz -82 dBm, for P 400 MHz to 790 MHz -36 dBm (250 nW) 100 kHz 4.1 790 MHz to
33、862 MHz -76 dBm, for P 862 MHz to 1 000 MHz -36 dBm (250 nW) 100 kHz 4.1 1 000 MHz -30 dBm (1 W) 100 kHz 4.1 NOTE: P = mean power of the transmitter. Ratio ofspuriousemission tomean power(reference bandwidth100 kHz)Mean power of the transmitter30 50 60 70 80 90 dBm1W 10W 100W 1kW 10kW 100kW 1MW2,5 5
34、 25 50 250 500 2,5 5 250 50025 50-30 dBm(1W)-100-90-80-709kHz - 174 MHz400 - 790 MHz 862 - 1000 MHz 1000 MHzdBc40-110-36 dBm(250nW)Figure 4.1: Spurious emission limits for DVB-T transmitters (100 kHz reference bandwidth) ETSI ETSI EN 302 296 V1.1.1 (2005-01)12Ratio ofspuriousemission tomean power(re
35、ference bandwidth4 kHz)-130Mean power of the transmitter30 40 50 60 70 80 90 dBm1W 10W 100W 1kW 10kW 100kW 1MW2,5 5 25 50 250 500 2,5 5 250 50025 50-82 dBm(6,3pW)-120-110-100-90 174 - 400 MHz 790 - 862 MHzdBc-66 dBm(0,25 nW)-76 dBm(25pW)-60 dBm(1 nW)Figure 4.2: Spurious emission limits for DVB-T tra
36、nsmitters (4 kHz reference bandwidth) 4.2.2 Out-of-band emissions 4.2.2.1 Definition Emission on a frequency or frequencies immediately outside the necessary bandwidth which results from the modulation process, but excludes spurious emissions. For the purposes of the present document out-of-band emi
37、ssions are emissions at frequencies outside the necessary bandwidth and within the frequency ranges f0 14 MHz for 7 MHz channels, f0 12 MHz for 8 MHz channels, where f0is the centre frequency of the channel, irrespective of the number of carriers employed. 4.2.2.2 Method of measurement (essential te
38、st suite) 4.2.2.2.1 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) the highest operating frequency of the EUT; 3) a frequency mid-way between 1) and 2) above. ETSI
39、ETSI EN 302 296 V1.1.1 (2005-01)13Test arrangement (see figure A.2): 1) connect the EUT to the test load, via the coupling device; 2) connect the spectrum analyser to the coupling device. For the purposes of this test no test signal is required, the manufacturer shall ensure that the full rated outp
40、ut power of the transmitter will be maintained during this test. 4.2.2.2.2 Procedure 1) operate the EUT at each of the test frequencies as defined in clause 4.2.2.2.1; 2) measure the results on the spectrum analyser. 4.2.2.2.3 Test requirements The results obtained shall be compared to the limits in
41、 clause 4.2.2.3 in order to demonstrate compliance. 4.2.2.3 Limit Out-of-band emissions shall not exceed the limits specified in tables 4.2 and 4.3, additionally shown in figures 4.3 and 4.4. Out-of-band emissions limits are given as mean power level measured in a 4 kHz bandwidth, where 0 dB corresp
42、onds to the mean output power. Unless otherwise declared by the manufacturer it shall be assumed that the EUT conforms to the non-critical case. For critical cases such as television channels adjacent to other services (low power or receive only) a spectrum mask with higher of out-of-channel attenua
43、tion may be needed. NOTE: In the case of a DVB-T transmitter supplied without an internal bandpass output filter, the manufacturer shall specify the characteristics of the filter necessary to fulfil the out-of-band emission masks defined in tables 4.2 and 4.3. The manufacturer shall include this inf
44、ormation in their test report. Table 4.2: Out-of-band emission limits for transmitter with output power 25 W Classification accordingly the frequency assignment 7 MHz Channel, frequency difference from the centre frequency (MHz) 8 MHz Channel, frequency difference from the centre frequency (MHz) Rel
45、ative level (dBc) 3,4 3,81 -32,2/-32,8 3,7 4,2 -73 5,25 6 -85 10,5 12 -110 Non-critical cases 13,85 - -126 3,4 3,81 -32,2/-32,8 3,7 4,2 -83 5,25 6 -95 10,5 12 -120 Critical cases 11,75 - -126 ETSI ETSI EN 302 296 V1.1.1 (2005-01)14Table 4.3: Out-of-band emission limits for transmitter with output po
46、wer 230 MHz to 4,5 GHz NOTE 1: P0= RF output power in W. NOTE 2: The exclusion band for the transmitter shall be the allocated channel. 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 =
47、distance in meter (m). NOTE 2: Care should be taken if measuring at test distances below 10 m as this may be in the near field. NOTE 3: In cases of dispute the measurement distance of 10 m shall take precedence. dBV/m7060504030Mean power of the transmitter30 40 50 60 70 80 90 dBm1W 10W 100W 1kW 10kW
48、 100kW 1MW2,5 5 25 50 250 500 2,5 5 250 50025 5030 MHz - 230 MHz230 MHz - 4,5 GHz80Figure 4.5: Cabinet radiation limits for DVB-T transmitters 4.4 Measurement uncertainties Measurement uncertainty should be calculated and techniques employed to minimize its range. This uncertainty should be applied
49、to the limit and any measurement falling below the range is deemed acceptable (TR 100 028 10). ETSI ETSI EN 302 296 V1.1.1 (2005-01)19Annex A (normative): General measuring arrangements A.1 Testing arrangements for antenna port measurements A.1.1 Spurious emissions DVB-T transmitter (EUT)Power AmplifierOutputFilterCOFDM ExciterInput SignalPower meter /Spectrum AnalyserCoupling DeviceTestLoadFilter(s)(see note 1)AttenuatorRF OutputABCA1C1B1NOTE 1: The optional filter should suppress the output signal so that no intermodulation products
