Describes measurement of operational characteristics of cabled distribution systems having coaxial cable outputs and operating between about 30 MHz and 1750 MHz.<\/p>\n
| PDF Pages<\/th>\n | PDF Title<\/th>\n<\/tr>\n | ||||||
|---|---|---|---|---|---|---|---|
| 1<\/td>\n | BRITISH STANDARD <\/td>\n<\/tr>\n | ||||||
| 2<\/td>\n | Committees responsible for this British Standard <\/td>\n<\/tr>\n | ||||||
| 4<\/td>\n | Foreword Foreword to amendment A1 Contents <\/td>\n<\/tr>\n | ||||||
| 7<\/td>\n | 1 Scope 1.1 General 1.2 Specific scope of this Part 7 <\/td>\n<\/tr>\n | ||||||
| 8<\/td>\n | 2 Normative references 3 Terms, definitions, symbols and abbreviations 3.1 Terms and definitions <\/td>\n<\/tr>\n | ||||||
| 13<\/td>\n | 3.2 Symbols <\/td>\n<\/tr>\n | ||||||
| 14<\/td>\n | 3.3 Abbreviations 4 Methods of measurement 4.1 Mutual isolation between system outlets <\/td>\n<\/tr>\n | ||||||
| 15<\/td>\n | 4.2 Amplitude response within a channel <\/td>\n<\/tr>\n | ||||||
| 17<\/td>\n | 4.3 Chrominance-luminance gain and delay inequalities <\/td>\n<\/tr>\n | ||||||
| 18<\/td>\n | 4.4 Non linear distortion <\/td>\n<\/tr>\n | ||||||
| 22<\/td>\n | Table 1 – Residual carrier reduction factors <\/td>\n<\/tr>\n | ||||||
| 26<\/td>\n | 4.5 Carrier to noise ratio <\/td>\n<\/tr>\n | ||||||
| 27<\/td>\n | 4.6 Echoes <\/td>\n<\/tr>\n | ||||||
| 28<\/td>\n | 4.7 Television and frequency modulation radio signal level <\/td>\n<\/tr>\n | ||||||
| 29<\/td>\n | 4.8 Data echo rating and data delay inequality 4.9 Interference in FM sound radio channels 4.10 Signal level for digitally modulated signals <\/td>\n<\/tr>\n | ||||||
| 31<\/td>\n | 4.11 Signal to noise ratio ( <\/td>\n<\/tr>\n | ||||||
| 32<\/td>\n | 5 Performance requirements 5.1 Impedance 5.2 Carrier levels at system outlets <\/td>\n<\/tr>\n | ||||||
| 33<\/td>\n | Table 2 – Carrier signal levels at any system outlet Table 3 – Maximum level differences at any system outlet between distributed television channels <\/td>\n<\/tr>\n | ||||||
| 34<\/td>\n | 5.3 Mutual isolation between system outlets Table 4 – Mutual isolation 5.4 Frequency response within a television channel at any system outlet for PAL and SECAM signals Table 5 – Amplitude response variation Table 6 – Group delay variation 5.5 Long term frequency stability of distributed carrier signals at any system outlet 5.6 Random noise <\/td>\n<\/tr>\n | ||||||
| 35<\/td>\n | Table 7 – Carrier to noise ratios at system outlet 5.7 Interference to television channels <\/td>\n<\/tr>\n | ||||||
| 36<\/td>\n | 5.8 Video baseband requirements 5.9 Hum modulation of carriers in television channels 5.10 FM sound radio: Additional performance requirements 5.11 NICAM performance <\/td>\n<\/tr>\n | ||||||
| 37<\/td>\n | Figure 1 – Arrangement of test equipment for measurement of mutual isolation between system outlets Figure 2 – Arrangement of test equipment for measurement of frequency response within a channel <\/td>\n<\/tr>\n | ||||||
| 38<\/td>\n | Figure 3 – Interpretation of displays for measurement of frequency response within a channel Figure 4 – Test signal (signal F for 625 line systems) employed for chrominance\/luminance gain and delay ine… <\/td>\n<\/tr>\n | ||||||
| 39<\/td>\n | Figure 5 – Test signal (signal B2 for 625 line systems) employed for chrominance\/luminance gain and delay in… Figur 6 – Arrangement of test equipment for measurement of chrominance\/luminance gain and delay inequality <\/td>\n<\/tr>\n | ||||||
| 40<\/td>\n | Figure 7 – Displayed pulses: chrominance low and lagging Figure 8 – Displayed pulses: chrominance high and leading <\/td>\n<\/tr>\n | ||||||
| 41<\/td>\n | Figure 9 – Weighting curve for 625 lines systems B and G (PAL); CW interference with no special (frequency o… <\/td>\n<\/tr>\n | ||||||
| 42<\/td>\n | Figure 10 – Weighting curve for 625 lines system I (PAL); CW interference with no special (frequency offset) … <\/td>\n<\/tr>\n | ||||||
| 43<\/td>\n | Figure 11 – Connection of test equipment for the measurement of non-linear distortion by composite beat <\/td>\n<\/tr>\n | ||||||
| 44<\/td>\n | Figure 12- Weighting curve for 625 lines systems B an G (SECAM); CW interference with no special (frequency … <\/td>\n<\/tr>\n | ||||||
| 45<\/td>\n | Figure 13 – Weighting curve for 625 lines system L (SECAM); CW interference with no special (frequency offset… <\/td>\n<\/tr>\n | ||||||
| 46<\/td>\n | Figure 14 – Hum modulation envelope Figure 15 – Connection of equipment for measurement of hum modulation (DC method) <\/td>\n<\/tr>\n | ||||||
| 47<\/td>\n | Figure 16 – Calibrated potential divider Figure 17 – Stable variable DC source <\/td>\n<\/tr>\n | ||||||
| 48<\/td>\n | Figure 18 – Oscilloscope display Figure 19 – Connection of equipment for hum modulation measurement (AC method) <\/td>\n<\/tr>\n | ||||||
| 49<\/td>\n | Figure 20 – Signal D2 for 625-line system Figure 21 – Arrangement of test equipment for measurement of echo rating <\/td>\n<\/tr>\n | ||||||
| 50<\/td>\n | Figure 22 – Example of the modified staircase waveform Figure 23 – Arrangement of test equipment for measurement of differential gain and phase <\/td>\n<\/tr>\n | ||||||
| 51<\/td>\n | Figure 24 – Arrangement of test equipment for carrier-to-noise ratio measurement <\/td>\n<\/tr>\n | ||||||
| 52<\/td>\n | Figure 25 – Echo rating graticule <\/td>\n<\/tr>\n | ||||||
| 53<\/td>\n | Annex A (normative) Calibration of modulation depth A.1 Equipment required A.2 Connection of the equipment A.3 Calibration procedure <\/td>\n<\/tr>\n | ||||||
| 54<\/td>\n | Annex B (normative) Equipment required \u2014 Additional items B.1 Measuring receiver preamplifier B.2 Measuring receiver input filter Annex C (normative) Preliminary checks on the measuring equipment for carrier to noise ratio C.1 Noise C.2 Intermodulation C.3 Overload Annex D (normative) Correction factors D.1 Level correction factor <\/td>\n<\/tr>\n | ||||||
| 55<\/td>\n | D.2 Bandwidth correction factor Annex E (normative) Calibration of the measuring receiver Annex F (informative) Bibliography <\/td>\n<\/tr>\n | ||||||
| 56<\/td>\n | Annex G (informative) A-deviations <\/td>\n<\/tr>\n | ||||||
| 57<\/td>\n | Figure G.1 – Mask group delay characteristic for PAL signals with FM-FM sound Figure G.2 – Template for the B, G, H, I, L standards RF protection ratio <\/td>\n<\/tr>\n | ||||||
| 58<\/td>\n | Figure G.3 – Requirement to echo-loss in relation to the time delay of the reflected signal Table G.1 – Test carrier frequencies for CTB measurement <\/td>\n<\/tr>\n | ||||||
| 59<\/td>\n | Annex H (normative) Correction factors for noise H.1 Signal level measurement H.2 Noise level measurement Table H.1 – Noise correction factor <\/td>\n<\/tr>\n | ||||||
| 60<\/td>\n | Figure H.1 Annex J (informative) Digital signal level and bandwidth J.1 RF\/IF power (\u201ccarrier\u201d) <\/td>\n<\/tr>\n | ||||||
| 61<\/td>\n | J.2 Bandwidth of a digital signal <\/td>\n<\/tr>\n | ||||||
| 62<\/td>\n | Table J.1 – Examples of bandwidth for digital modulation techniques Annex K (informative) Power density method <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" Cable networks for television signals, sound signals and interactive services – System performance<\/b><\/p>\n |