Common Mode Noise Filter – Coax Snap On - Mix 43 - RFI Range 25-300 MHz Store/Ferrite Core Products/Mix 43/Snap On - Mix 43 - RFI Range 25-300 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