filter for extreme rfi environments

filter for extreme rfi environments
FILTER FOR EXTREME RFI ENVIRONMENTS
This LC Filter network has proven to be effective in filtering out AM RFI.
Install this filter by hard wiring it (i.e. soldering) into an XLR shell on the end of a mic cable.
Attach the modified end of the mic cable to the mixer’s mic preamp input.
XLR Connector
0.0047µF
220µH
HOT
220µH
Mic Cable
Mixer Input
COLD
COMMON
For very extreme RFI environments, the capacitor can be changed to 0.01µF.
Parts Required
Coil
Unsheilded 220µH
Sheilded 220µH
Digikey part#
DN-2576-ND
DN-41224-ND
Phone#
800-344-4539
Capacitor
Poly 0.0047µF/50V
Ceramic 0.01µF/50V
Mackie part#
200-034-00
210-001-00
Phone#
800-258-6883
Note: Mackie Designs makes no claims as to 100% effectiveness of the above mod.
Factors such as location and sound system installation techniques can make a drastic
difference in RFI intensity.
RFI mod August 1999
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