GSM-noise "buzz" issue
werner at openmoko.org
Sat Sep 20 23:46:20 CEST 2008
Joerg Reisenweber wrote:
> YUP, long ago. Result: fix noise.
> Maybe you even
> could visit me at Guantanamo then, which is more close to Argentina than
> Germany is. :D
Heh, Joerg, the internationally wanted RF Cyberterrorist ;-)
But that's something you'll have to solve anyway. Otherwise, even
the nicest CMU200 will be of little use.
> > Basic guidelines:
Good principles for sure.
> > All connectors to outside of housing SHOULD have EMI-filters [[edit: as
> > close as possible to component]] on all lines
Shouldn't the EMI filters rather be where the signals enters the cage ?
> > *) that's one of the points why it's more reasonable to have a separate
> > cage.
Hmm, makes the mechanical setup more complex, though.
> > We don't want the need for EMI-block on lines that aren't related to
> > audio, but run to same cage.
Shouldn't they be filtered anyway, lest we contaminate other signal
paths, e.g., hyper-sensitive GPS ?
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