GSM-noise "buzz" issue - replace R4401 by bead?
joerg at openmoko.org
Mon Oct 13 02:44:01 CEST 2008
Contamination path seems via R4408. Complete removal of both R (plus any other
components connecting this trace to the remaining circuit) didn't stop buzz
though - we think RF is coupled to a nearby trace or component near trace end
on R4408 inside can, near Wolfson.
So probably when removing doesn't help, replacing with a ferrite bead won't
either. But we never tested it. If you're keen to do it, your report on it is
highly appreciated, no matter whether positive or negative result.
Am Mo 13. Oktober 2008 schrieb Laurie Bradshaw:
> Hi, I've also been suffering with this buzz problem, and have been
> wondering if replacing R4401 with a suitable 220R smd ferrite might
> achieve the desired result whilst hopefully being at least a little
> easier than trying to retrofit a ferrite bead to JK4401.
> 2008/10/13 Joerg Reisenweber <joerg at openmoko.org>:
> > Am Mo 13. Oktober 2008 schrieb shawnzier at gmail.com:
> >> Sorry about the dumb question. I was just wondering if bluetooth headsets
> > would be affected by this buzz problem.
> > No. Will work without buzz
> > /jOERG
> > _______________________________________________
> > hardware mailing list
> > hardware at lists.openmoko.org
> > http://lists.openmoko.org/mailman/listinfo/hardware
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