Hi, Need to make common-mode choke to give maximum impedance at 28 MHz, coax is RG-213, but unsure of Fair-Rite part number for mix-43 toroids (order would be to mouser, so an appropriate part number from them?). I've read the YCC article (2006?) by W1HIS), but needed clarification. Any advice appreciated. Thank you Steve GW4BLE Sent from my iPhone 5S