On Tuesday 05 August 2008, arne anka wrote: > > http://gadgets.boingboing.net/2008/08/02/kill-gsm-radio-buzz.html > > Maybe that could provide a less invasive means to getting rid of the > > problem? > > jOERG proposed using a ferrite bead on the wired headset a while ago in a > german forum (freeyourphone.de or so). > i am still trying to find one which is capable to be put on the included > headset non-destructive (both the bead and the headset). > > ps: i was still under impression, the bead has to fit _around_ the cable > -- the page says, it can be attached simple with tape as well. > has someone a link explaining exactly what kind of voodoo that thing does? > has it to have a hole?
The ferrite is increasing the common mode inductance of the cable because the ferrite has a better magnetic permeability than air. Taping the ferrite to the cable is a bit like a half turn on a ferrite rod. It will still affect the inductance, but not as much as if it went through a ferrite ring. _______________________________________________ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community