1、 ETSI EN 302 297 V1.1.1 (2005-01)Candidate Harmonized European Standard (Telecommunications series) Electromagnetic compatibilityand Radio spectrum Matters (ERM);Transmitting equipment for theanalogue television broadcasting service;Harmonized EN under article 3.2of the R Essential, or potentially E
2、ssential, 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 carried out by ET
3、SI. 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 series) has been
4、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 the provision o
5、f 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 of the European Parliament and of the
6、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 Commission take the nece
7、ssary 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 documents directly associated with the present document: EN 301 489-14 5. ETSI ETSI EN 3
8、02 297 V1.1.1 (2005-01)8 1 Scope The present document applies to transmitting equipment for the analogue television broadcasting service. The types of equipment covered by the present document are as follows: Television transmitter equipment for analogue television broadcasting service, with 7 MHz a
9、nd 8 MHz RF channel bandwidths, operating in the CEPT frequency bands. These frequencies are currently within the television Bands I, 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) standard for ra
10、dio equipment and services; Part 14: Specific conditions for analogue and digital terrestrial TV broadcasting service transmitters“. 6 CENELEC EN 55022 (1998): “Information technology equipment - Radio disturbance characteristics - Limits and methods of measurement“. 7 CENELEC EN 55011 (1998): “Indu
11、strial, scientific and medical (ISM) radio-frequency equipment - Radio disturbance characteristics - Limits and methods of measurement. ETSI ETSI EN 302 297 V1.1.1 (2005-01)9 8 IEC 60489-1 + Am1 (1996) + Am2 (1999): “Methods of measurement for radio equipment used in the mobile services. Part 1: Gen
12、eral definitions and standard conditions of measurement“. 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 normal operation, to be connected to an ant
13、enna using coaxial cable analogue signal: signal in which the characteristic quantity representing information may at any instant assume any value within a continuous interval analogue television: television in which picture information is represented by an analogue signal NOTE: Sound information ca
14、n be represented by an analogue and/or digital signal 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 transmission cabine
15、t 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: set of charac
16、teristics 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 emission NOTE
17、: 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. digital signal: discretely timed signal in which information is represented by
18、 a finite number of well defined discrete values that its characteristic quantities may take in time 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 from the anten
19、na port. environmental profile: range of environmental conditions under which equipment within the scope of EN 302 297 is required to comply with the provisions of EN 302 297 exclusion band: band of radio frequencies where no measurements are made harmonic: component of order greater than 1 of the F
20、ourier series of a periodic quantity harmonic number: integral number given by the ratio of the frequency of a harmonic to the fundamental frequency EXAMPLE: (2ndharmonic = 2 x fundamental frequency). intermodulation products: unwanted frequencies resulting from intermodulation between carriers or h
21、armonics of emission or between any oscillations generated to produce the carrier ETSI ETSI EN 302 297 V1.1.1 (2005-01)10mean 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 modulati
22、on taken under normal operating conditions NOTE: For analogue television transmissions, the mean power level is defined with a specified video signal modulation. This video signal has to be chosen in such a way that the maximum mean power level (e.g. at the video signal blanking level for PAL) is pr
23、ovided to the antenna transmission line. 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 frequen
24、cy or frequencies immediately outside the necessary bandwidth which results from the modulation process, but excluding spurious emissions rated output power: rated output power is the power that the transmitter or transposer shall deliver at its output under specified conditions of operation referen
25、ce bandwidth: bandwidth in which the emission level is specified 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 Spurious emissions include harmo
26、nic emissions, parasitic emissions, intermodulation products and frequency conversion products but exclude out-of-band emissions television transmitter: used in EN 302 297 to refer to that equipment with a video input and one or more audio inputs and a combined vision and sound radio frequency outpu
27、t unwanted emissions: consist of spurious emissions and out-of-band emissions letterbox operation: transmission of a picture format with an aspect ratio greater than 1,33, in such a way that empty (black) lines are added to conform to a 4:3 transmission format 3.2 Symbols For the purposes of the pre
28、sent document, the following symbols apply: Micro 3.3 Abbreviations For the purposes of the present document, the following abbreviations apply: DQPSK Differential Quadrature Phase Shift Keying EMC Electro Magnetic Compatibility EUT Equipment Under Test FM Frequency Modulation IRT Institut fr Rundfu
29、nk Technik LV Low Voltage NICAM Near Instantaneous Companded Audio Multiplex PAL Phase Alternating on the Line R b) the highest operating frequency of the EUT; c) a frequency mid-way between a) and b) above. Test arrangement (see figure A.1): a) connect the Test Signal Generator to the EUT; b) conne
30、ct the EUT to the Test Load, via the Coupling Device; c) connect the Spectrum Analyser to the Coupling Device. The test signal shall be as defend in clause A.1.3.1. 4.2.1.2.2 Procedure a) set the Test Signal Generator to deliver a test signal; b) operate the EUT at each of the test frequencies as de
31、fined in clause 4.2.1.2.1; c) 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 4.2.1.3 in order to demonstrate compliance. ETSI ETSI EN 302 297 V1.1.1 (2005-01)124.2.1.3 Limit Spurious emissions shall not exceed
32、the values set out in table 4.1, shown additionally in figure 4.1 for the frequency range 9 kHz to 4,5 GHz. Table 4.1: Spurious emission limits for analogue television broadcast transmitters Mean power of the transmitter Limits mean power absolute levels (dBm) or relative levels (dBc) below the powe
33、r supplied to the antenna port in the reference bandwidth (see annex A) P 230 MHz to 4,5 GHz NOTE 1: P0= RF output power in W. NOTE 2: The exclusion band for the transmitter extends from Fc - 24 MHz to Fc + 24 MHz, where Fc is the channel centre frequency in MHz. NOTE 1: The measurements can be carr
34、ied 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 the near field. NOTE 3: In cases of dispute the measurement
35、distance of 10 m shall take precedence. ETSI ETSI EN 302 297 V1.1.1 (2005-01)22dBV/m7060504030Mean 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 5030 MHz - 230 MHz230 MHz - 4,5 GHz80Figure 4.5: Cabinet radiation limits for analogue
36、television transmitter 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 acceptable. ETSI ETSI EN 302 297 V1.1.1 (2005-01)23An
37、nex A (normative): General measuring arrangements A.1 Testing arrangements for antenna port measurements For test arrangements for unwanted emissions see figure A.1. A.1.1 Spurious and out-of-band emissions AnalogueTV TransmitterPower meter /Spectrum Analyser Coupling DeviceTest Load RF OutputVoltag
38、e MeasuringEquipmentTest Signalgenerator Figure A.1: Testing arrangement for unwanted emissions A.1.2 Test frequency range Limits on unwanted emissions for radio equipments are considered to be applicable to the range 9 kHz to 300 GHz. However, for practical measurement purposes, the frequency range
39、 of spurious emissions may be restricted. As guidance for practical purposes, the following measurement parameters in table A.1 are recommended. Table A.1: Test frequency range Unwanted emission frequency measurement range Transmitter fundamental frequency range lower frequency upper frequency 47 MH
40、z to 862 MHz 9 kHz 4,5 GHz The following reference bandwidths are to be used: For spurious emissions: 1 kHz between 9 kHz and 150 kHz; 10 kHz between 150 kHz and 30 MHz; 100 kHz between 30 MHz and 1 GHz; 1 MHz above 1 GHz. ETSI ETSI EN 302 297 V1.1.1 (2005-01)24For out-of-band emissions: 50 kHz. A.1
41、.3 Test modulating signal A.1.3.1 Spurious emissions The Vision carrier shall be amplitude modulated with composite sync pulses with black level (negative modulation systems) or with white level (positive modulation systems), the Sound 1 ( mono ) carrier shall be frequency modulated with a 1 kHz sin
42、usoidal signal at a level to cause a frequency deviation of 50 kHz and the sound 2 (NICAM or 2ndFM carrier) carrier shall be modulated as follows: NICAM: DQPSK with a pseudo random bit sequence; IRT System: 1 kHz sinusoidal signal at 50 kHz frequency deviation. A.1.3.2 Out-of-band emissions The Visi
43、on carrier shall be amplitude modulated with composite sync pulses and a 350 mV luminance bar with a superimposed, full amplitude, signal swept in frequency between 0,2 MHz and 5,2 MHz (B,G) and 5,5 MHz (I), the Sound 1 (mono) carrier shall be frequency modulated with a 1 kHz sinusoidal signal at a
44、level to cause a frequency deviation of 50 kHz and the sound 2 ( NICAM or 2ndFM carrier) carrier shall be modulated as follows: NICAM: DQPSK with a pseudo random bit sequence; IRT System: 1 kHz sinusoidal signal at 50 kHz frequency deviation. A.2 Testing arrangements for enclosure port (radiated emi
45、ssions) measurements Guidance of methods of measurement can be found in IEC 60489-1 amendment 2 8. Analogue TV TransmitterInput SignalPower Meter /Spectrum AnalyserCoupling DeviceTestLoadRF OutputMeasuring Receiver/Spectrum AnalyserFigure A.2: Testing arrangement for cabinet radiation ETSI ETSI EN 3
46、02 297 V1.1.1 (2005-01)25Annex B (informative): Bibliography CEPT/ERC/Rec T/R 25-06 (Odense 1986): “Planning parameters to assist in the efficient and effective utilisation of shared frequency bands which are allocated to the broadcasting service (television) and the land mobile service using assign
47、ments which overlap a television channel (television bands I and III only)“. Chester 1997 Multilateral Co-ordination Agreement Relating to Technical Criteria, Co-ordination principles and Procedures for the introduction of Terrestrial Digital Video Broadcasting (DVB-T), Chester 25July 1997, Resoluti
48、on 5. ITU-Recommendation BT.470-6 (1998): “Conventional television systems“. ITU-R Recommendation SM.329-10: “Unwanted emissions in the spurious domain“. CEPT/ERC Recommendation 74-01: “Spurious emissions.“ ITU-R Recommendation SM.1541-1: “Unwanted emissions in the out-of-band domain“. ITU- Recommen
49、dation SM.328-10: “Spectra and bandwidth of emissions“. ETSI EN 300 163 (V1.2.1): “Television systems; NICAM 728: transmission of two-channel digital sound with terrestrial television systems B, G, H, I, K1 and L“. IEC 60244-1: “Methods of measurement for radio transmitters - Part 1: General characteristics for broadcast transmitters“. IEC 60244-5: “Methods of measurement for radio transmitters - Part 5: Performance characteristics of television transmitters“. IEC 60244-6: “Methods of measurement for radio transmitters - Part 6
