Satellite Dish: Design Power Supply Using Coaxial Cable

Providing "Phantom" power to the dish is quite easy. The limitation you will find is that the Coax has a limitation as to how much current it will allow before the insulation becomes degraded. Most Coax will deal with modest current/voltage in the 12/24 2 amp range. 5 Amps is asking a lot unless your using LDF Transmission line.

RF will happily co exist with DC on the same cable. The trick is to inject and extract the RF at either end without degrading the RF signal. Easy done if your not dealing with too broad a spectrum.

At the power supply end you will need to have an RF trap to stop the RF from influencing the regulator circuit.

At the Dish end you need to pay attention to the RF injection/ Dish power supply section to avoid a positive feedback situation of the RF.

Any school boy hobbyist can sort something out for you. There are plenty of circuits and information out there if you lurk hard enough.

Find an old school RF techie, he'll give you the results you want.

Disclosure; No I'm not angling for the job, got way to much to deal with already, thanks.