Hi Grant,
The shield only shields electrostatic fields and does not shield the
magnetic field from the inner conductors. If the garbage is on the USB
signal lines and common mode (likely), the ferrite will still be
effective. If the RFI is transverse (or differential) mode, then the
external fields from those signal conductors will largely cancel and
ferrite will have little or no effect.
BTW, Pro Audio Engineering is a first-line Fair-Rite dealer and we have
good stock on many mix 31 parts at good prices in small quantities.
Cheers & 73,
Howie / WA4PSC
www.proaudioeng.com
If the cable is shielded, and the garbage is on the PC's USB signal lines,
an external ferrite won?t do any good. I don?t know if the cable is
shielded or not, but if it is, then the garbage may not be on the shield
? and perhaps the USB isolator might be worth a try. Maybe.
I don?t know anything about that device ?
Grant NQ5T
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