[Elecraft] FM Broadcast RFI

[CHARLES K BROWN]

If this is the power supply leads,  try filtering the plus
and minus leads  with ferrite beads of the proper size,
or similar ferrite cores for the power supply cable.
Switching power supplies use ferrite beads because
of objectionable amounts of RF noise.  On one Switcher,
six Amidon FB-73-2401 ferrite beads were used on each
DC cable.   Internally,  Type 73 beads are used for more
RFI filtering.  FB-73-801 is one type for wires inside the
case.  Ferrite beads or ferrite cores would work on any of
the other cables that could be acting as an antenna for
FM broadcast harmonics.

N4SO
Ken Brown
Mobile, AL/EM50tk
NorCal-20/5 watts/4 ele. beam


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