DiSEqC Stacker De-Stacker SDS allows two satellite bands0.95-2.15 GHz to be transmitted via a single common coaxial cable between the LNB/multi-switch feeds and the satellite receivers STB. Automatic Slope Compensation allows the unit to cover cable lengths of up to 30 metres. Extendable to cover cable lengths up to 60 metres with the addition of an SDS Line Amplifier Order AE8975 Combining of the bands is implemented in Stacker with frequency UP conversion of one of the satellite signals SAT and combining it with the other SAT TV. The second signal SATTV is not converted and can carry terrestrial signals 15-860 MHz in addition to the satellite band.The combined signal from the Stacker is distributed via the common cable and split into the original two signals in De-Stacker which also DOWN converts one of the bands SAT to the original frequencies. Terrestrial is made available on one of the De-Stacker ports. Powering of the system is provided from a separate 20V power supply connected to De-Stacker to avoid any switching problems from the Set-top box STB.