SRT optics have been chosen trying to obtain the maximum number of focal positions, so that there will be a lot of possibilities in locating the receiver systems.
There will be 6 focal positions corresponding to 3 working areas :
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Primary focus : F1 |
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Gregorian focus : F2 |
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Beam Wave Guide : 2xF3 , 2xF4 |

Fig. 3.1 : SRT focal positions
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