# RF cable with DC power cable?

I have a satellite communication system at office running on C-band. The C-band is downconverted to L-band and carried to the l-band modem. With this RF coaxial waveguide/cable, +12V DC power cable for the outdoor amplifier is also routed tied together. I know ac power cable shouldn't be laid along with the RF/coaxial cables. But I am not sure with the DC cable. So my first question is Can we route RF cable along DC power cable? And what is the minimum separation to be maintained if we have to.

For the second question, I read researching on the subject that power cable can laid in perpendicular with the RF cable but not parallel. I have a guess for the reason being that the magnetic field vector from the power cable shouldn't effect the electric field vector of the RF cable, but sure. So can someone please explain the reason for laying the power cable with RF cable in perpendicular (if needed) but not parallel?

• Just send the DC up the same cable as the RF. It's commonly done, because it's a simple matter to separate the DC from the RF at each end. Commented Jan 25, 2016 at 15:40
• You worry about this too much ! The RF signal and the DC signal will not bite each other. Many systems even share the Coax cable for RF and DC. At in and outputs AC and DC are separated by filters. You can just run a DC cable in parallel with the Coax, the Coax is shielded so the DC cable cannot harm the RF signal. Commented Jan 25, 2016 at 15:41