When splitting signals via any Active RF splitter the power provided by the RF Out on a DSTV decoder or any other RF out on a device is enough to power the Active RF Splitter when 2 or more splitters are cascaded. When cascading more than one Active RF e.g 1x4 Active RF cascaded onto a 1x2 or another 1x4 Active RF splitter an external power supply such as this one is needed to ensure enough power supplied to both splitters
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Active RF Splitters are listed at Active RF Splitters.