Recommended maximum cable lengths for use with SW21 and SW42 switches
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As can be seen from this chart, the total length from the receiver to the LNB can be much longer if the switch(es) are mounted closer to the receiver.

Receiver to switchSW21 to LNBFSW42 to LNBF
10 165 150
20 155 140
30 140 130
40 115 100
50 100 85
60 85 60
70 60 40
80 40 30
90 10 10