Split emi suppression ferrite cable cores meisongbei sf 70a a cylindrical split ferrite cable core that can take a max cable diameter of 70mm the core has an impedance of 50omega at 25mhz and 115omega at 100mhz this device will greatly reduce both common and differential mode emirfi and is a cost effective solution for retrofit and post assembly use for internal and external power and data cables meisongbei sf 70a 70mm split ferrite cable core