BSI PD IEC/TR 60728-3-2:2016
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Cable networks for television signals, sound signals and interactive services – Method of measurement of 5th order non-linearity for active electronic equipment using five carriers
| Published By | Publication Date | Number of Pages |
| BSI | 2016 | 28 |
This part of IEC 60728 is applicable to the measurement of 5th order non-linearity for active electronic equipment which carries only digitally modulated television signals, sound signals and signals for interactive services. This method of measurement is specifically applicable to MATV installations but could be applied to broadband and channel selective amplifiers used in all kinds of cable networks.
NOTE 1 The methods of measurement of non-linearity (intermodulation products) applicable to active equipment, when loaded with analogue signals, considered that third order intermodulation products were the most important ones. The new era of television digital signals, transmitted according to DVB-S/S2, DVB-C/C2 and DVB-T/T2 modulation formats, has shown that the non-linear distortions (intermodulation products) in active equipment, when loaded with digital signals, are significant up to the 5th order.
NOTE 2 With this method of measurement it is possible to obtain information on non-linear distortions (intermodulation products) up to the 5th order in active wideband equipment, using only 5 carriers, placed in an appropriate and suitable way in the equipment bandwidth. Moreover, with this method of measurement it is possible to obtain information on non-linear distortions (up to the 5th order) in narrowband equipment (channel amplifiers and channel frequency converters) carrying DVB-C/C2 and/or DVB-T/T2 signals.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 4 | CONTENTS |
| 6 | FOREWORD |
| 8 | INTRODUCTION |
| 9 | 1 Scope 2 Normative references 3 Terms, definitions, symbols and abbreviated terms 3.1 Terms and definitions |
| 11 | 3.2 Symbols 3.3 Abbreviated terms |
| 12 | 4 Method of measurement of 5th order non-linearity for active electronic equipment using five carriers 4.1 General |
| 13 | 4.2 Equipment required 4.3 Connection of the equipment 4.4 Measurement procedure for 3rd order and 5th order intermodulation products Figures Figure 1 – Measurement configuration with 5 carriers |
| 14 | Figure 2 – The five carriers equally spaced at distance D and the intermodulation products |
| 15 | 4.5 Measurement procedure for 2nd order intermodulation products 4.6 Presentation of the results |
| 16 | 4.7 Estimated maximum usable output level with a higher number of channels 4.8 Setting of the 5 carriers frequencies for narrow-band equipment 5 Equipment characteristics required to be published |
| 17 | 6 Example of measurement results Figure 3 – Example of measurement results using the measuring method with 5 carriers |
| 18 | Annex A (informative) Examples of measurement frequencies for channel spacing of 7 MHz and 8 MHz A.1 Wide-band equipment A.1.1 General A.1.2 Operating frequency range: VHF A.1.3 Operating frequency range: UHF Tables Table A.1 – Allocation of measurement carrier frequencies (MHz) and intermodulation products in VHF – Band III Table A.2 – Allocation of measurement carrier frequencies (MHz) and intermodulation products in UHF – Band IV Table A.3 – Allocation of measurement carrier frequencies (MHz) and intermodulation products in UHF – Band V (Low part) |
| 19 | A.2 Narrow-band equipment A.2.1 General A.2.2 Operating frequency range: VHF A.2.3 Operating frequency range: UHF Table A.4 – Allocation of measurement carrier frequencies (MHz) and intermodulation products in UHF – Band V (High part) Table A.5 – Allocation of measurement carrier frequencies (MHz) and intermodulation products in VHF – Band III, narrow-band equipment |
| 20 | Table A.6 – Allocation of measurement carrier frequencies (MHz) and intermodulation products in UHF – Band IV, narrow-band equipment |
| 21 | Table A.7 – Allocation of measurement carrier frequencies (MHz) and intermodulation products in UHF – Band V, narrow-band equipment |
| 22 | Annex B (informative) Examples of measurement frequencies for channel spacing of 6 MHz B.1 Wide-band equipment B.1.1 General B.1.2 Operating frequency range: VHF B.1.3 Operating frequency range: UHF Table B.1 – Allocation of measurement carrier frequencies (MHz) and intermodulation products in VHF – Band III Table B.2 – Allocation of measurement carrier frequencies (MHz) and intermodulation products in UHF – Band IV Table B.3 – Allocation of measurement carrier frequencies (MHz)and intermodulation products in UHF – Band V (Low part) |
| 23 | B.2 Narrow-band equipment B.2.1 General B.2.2 Operating frequency range: VHF B.2.3 Operating frequency range: UHF Table B.4 – Allocation of measurement carrier frequencies (MHz) and intermodulation products in UHF – Band V (High part) Table B.5 – Allocation of measurement carrier frequencies (MHz) and intermodulation products in VHF – Band III, narrow-band equipment |
| 24 | Table B.6 – Allocation of measurement carrier frequencies (MHz) and intermodulation products in UHF – Band IV, narrow-band equipment |
| 25 | Table B.7 – Allocation of measurement carrier frequencies (MHz) and intermodulation products in UHF – Band V, narrow-band equipment |
| 26 | Bibliography |
