Can ferrites be retro fitted to solve EMC issues at all frequencies?

Ferrites are very handy as retro EMC “Fix-Its” to get rid of unwanted common mode noise on cables and hence possible radiated emissions issues however they are limited in the frequency range they can be used at. The general rule of thumb is that the lower the frequency, the larger amount of Ferrite you need, so at a couple of MHz, 6 ferrites the size of your fist with six cable turns around each is needed just to get rid of a few dBs of unwanted noise.

A more practical approach for unwanted noise below 30MHz is to use filtering.

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