Ferrite Core Products SWAN Electronics Transceiver RFI Kits Store / SWAN Electronics Transceiver RFI Kits SWAN 250, 350, 400, 500, 700 Transceiver RFI Kit - 4 RFI/Noise Reduction Filters SWAN 250, 350, 400, 500, 700 Transceiver RFI Kit - 4 RFI/Noise Reduction Filters SKU RFI-SWAN $34.95 Buy Now