On Wed, 11 Aug 2004 11:58:30 -0500, Duane A Calvin wrote:
>And, there are some speakers that cannot be cured with ferrites because
>the reception is actually happening inside the speaker.
That might be true, but it also might not.
First, passive loudspeakers do NOT detect RF. If the loudspeaker has an
internal power amp, that power amp CAN detect the RF.
Second, you may have not used the "right" ferrite, or you may have used too
few, or even too many, turns.
Third, the RF could, as you say, be picked up on wiring internal to the power
amplifier due to its poor shielding. In my experience, that is the least common
and least powerful mechanism. The more common one is antenna action on
either the power leads or the signal wiring. In those instances, choking the
current will generally eliminate the RFI.
Jim Brown K9YC
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