http://www.titaniumsatellite.com/products#!/FS1-Flat-Scalar-for-Prime-Focus-Dish/p/39948004
On your prime focus dish, the scalar serves two purposes.
1. To hold the feedhorn in the correct position to receive the reflected signals from the reflector.
2. To optimize the reflected signals so only the reflector surface is illuminated (not under or over illuminated) and the desired signals directly in front of the dish are received but the off-axis signals from adjacent satellites / terrestrial noise are rejected.
The flat scalar is included with the C1-PLL LNBF.
Most use good quality Rg6 coax to connect to the LNB(f). You will also need 2 heavy gauge wires to power the actuator (motor) and two lighter gauge wires with separate shielded for the positioner sensor.
Does the dish currently have a motor? What brand/model? What will you use to move and position the actuator? Most hobbyists use a controller that the satellite receiver automatically controls when a satellite or channel is selected. Your choice would be a Gbox / Vbox or our ASC1.
Some hobbyists use a legacy IRD like a 4DTV or analog unit to position the dish, but these IRDs are not automatic and you would need to manually select the satellite to coordinate with the channel that you want to view on the DVBS S2 receiver. It is less expensive to go this route, but it is a pain in the butt to manually position the dish this way! No automatic multi-satellite scanning and you can just change channels to watch another channel.