And remember on the ferrites- if they are big enough, you can make multiple
passes through them- the reactance goes up as the square of the number
of
turns- saves on ferrites.

Dale W4OP

Hi Dale - I've done this with standard electrical cords (like zipcord),
but that's much smaller stuff and works OK with little snap-on types of
ferrites. Your comment suggests that one would benefit from one of
those great big toroids about 4 to 6 inches across, threading the coax
through it many times - is that right? If so, is it best to wind it
tightly, or does that risk messing up the construction of the coax?

Thanks,
Bruce Jensen