Re: Ferrite Beads - Bad idea?

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "davep by way of Terry Fritz <teslalist-at-qwest-dot-net>" <davep-at-quik-dot-com>


>I thought they would not affect anything but maybe higher frequency RF 
>noise off the gap (which they do well).  However...
>Last week I noticed that they get quite warm!

         Yep.
         Ferrites work that way: converting 'high' frequencies
         to heat.  Used as noise filters (eg EMI/FCC
         Compliance) power levels are low, so heating is
         minor.  Used in high (rf) power environment, they
         can heat/overheat/etc.

         A related thought:
         Different ferrites are compounded for different
         freqs.  Many will have low loss at 'coiling' freqs,
         which can be a good thing, or a bad thing, depending
         on the objective...

         best
         dwp

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         -me
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