Glen, just put a capacitor between the shield braid and the earth to the negative, mainly to stop any currents that may some how short or back spike down the IBC battery eliminator circuit regulator. This will stop the problem that we had in Robowars 2003. I dont think ferrite cores will be necessary, we only have ours could out the box straight with no gromets or ferrites and our radio reciever is tops right now.