jeallen01
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At around 200kHz, the beads would have to VERY big to have any effect (think PSU chokes), and, of course, the ferrites in them differ in terms of frequency response and most beads are intended for much higher frequencies.Just reading their repl
I tried loads of different type ferrites, it made no difference.
Also (and I'm now getting a bit rusty at this, not having been involved in EMI suppression for over 3 yrs, so it could be the other way round!) if the coupling mode is Common, rather than Differential, Mode then they won't have much effect as the coupling path would also include the return path via a capactive external "virtual ground" link through the plastic case to whatever else is close to the unit.