 U600 mastergroup is used as a building block for further to sit in the higher order spectrum at 312 to 552kHz. translations whereas the L600 mastergroup is used directly for Hypergroups (900 channels) are used as building blocks to as- transmission as a 600 channel system. Six mastergroups form a semble large groupings up to 60MHz, the most important is the supermastergroup of 3600 channels. 12MHz 2700 channel system. The carrier frequency chart up to 12MHz is shown in Figure 20.4. Frequency translation 20.3.4.2 Mastergroup The ring bridge modulator/demodulator typically provides the The mastergroup (Figure 20.5) is a 5 supergroup assembly using general features for frequency translation. With reference to Figure supergroups 4 to 8 and spans 812kHz to 2044kHz. This is an 20.7, a sinusoid carrier is supplied at a high level (+10dBm to +13 3.825 SPEECH CHANNEL CHANNEL CARRIER GROUP GROUP CARRIER SUPERGROUP 1 116 1 364 1 612 1 860 2 356 2 604 2 852 3 100 3 384 3 844 SUPERGRP CARRIER 1 052 1 300 1 796 2 044 2 292 2 540 2 788 3 036 3 532 3 780 1 060 2 052 2 300 2 584 3 044 3 540 HYPERGROUP 8 432 12 648 HYPERGROUP CARRIER 4 028 12 336 HYPERGROUP 8 620 TRANSLATING Figure 20.4 Translation frequencies and carriers (UK hierarchy) 20/6 Frequency division multiplexing SUPERGROUP MASTERGROUP SUPERMASTERGROUP TRANSLATING TRANSLATING ASSEMBLIES. SMG 2 Supermastergroup 12 X SMG 8 516 12 338 kHz 60 MHz System Supergroup Assembly 4 332 59 684 kHz 312 552 kHz Mastergroup SMG 13 812 044 kHz 4MHz System 316 188 kHz Television Assembly Translating SMG 1 18 MHz System 4 X SMG 316 17 004 kHz Assembly 1.3 MHz System For previous MG 1* SGM 4 64 12 96 kHz Translation Stages Assembly SMG 1 see Figure 20.2 12 MHz system 3 X SMG Uses a different carrier from the conventional 316 12 388 kHz Assembly Mastergroup 1 SMG 3 Coaxial cable, Radio, or Satellite Links. Figure 20.5 Mastergroup hierarchy dBm) sufficient to forward bias the diodes D1 and D2 or D3 and D4 it(1)=k,sin + k3 sin 3w + k5 sin 5w ct + (20.1) depending on the polarity of the carr