Page 451 - Satellite Communications, Fourth Edition
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Satellite Access 431
Figure 14.8 Channeling scheme for the Spade system.
matching. Thus six channels are removed from the total of 800, leaving
a total of 794 one-way or 397 full-duplex voice circuits, the frequencies
in any pair being separated by 18.045 MHz, as shown in Fig. 14.8. (An
alternative arrangement is shown in Freeman, 1981.)
All the earth stations are permanently connected through the CSC.
This is shown diagrammatically in Fig. 14.9 for six earth stations A, B,
Figure 14.9 Diagrammatic representation of a Spade communications
system.
