Ferrites on the cord don't work on 160 meters if they are of
the single turn class: easy to use, but ineffective, clamp on beads.
What does have a chance of working is 15 or so turns on a 2.4 inch O.D.
toroid. Impedance varies as the square of the number of turns, so
15 turns is like 225 beads. Fair-Rite Products also makes some large
clamp on ferrites that you can wind with a lot of turns. The advantage
of these is that the plug on the end of the cord is no longer a
constraint.
People just love adding series impedances, that what we do as hams. :)
Bypassing is usually much more effective than simply adding series
impedances. Sometimes bypassing alone is more than enough. 90% of the time
when I clean up an offshore SMPS for Ham use, it is just moving ground leads
and bypassing. :)
73 Tom
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