Common Mode Noise Filter – Coax Mix 31 Store/Ferrite Core Products/Mix 31Ring - Mix 31 - RFI Range: 1-300 MHzRing - Mix 31 - RFI Range: 1-300 MHzSnap On - Mix 31 - RFI Range 1-300 MHzSnap On - Mix 31 - RFI Range 1-300 MHzSlip On - Mix 31 - RFI Range 1-300 MHzSlip On - Mix 31 - RFI Range 1-300 MHz Typical user comment: The filter was quite effective. Was surprised that it actually reduced the noise level more than the signal so S+N/N improved by 1.9 S units. Bill