Fred W4JLE wrote:
At some point a resonance will occur Reg. And while some particular
combination may work - i.e. 7,427 ferrite beads along 841 feet of coax. I
have found no practical balun that does the deed from 1.8 to 30.

Those that work well at 1.8 seem to end up with a resonance somewhere over
20 Mhz..
. . .

You're using the wrong kind of ferrite. Type 43, the most common type
used for large cores, has a Q of 1 in the middle of the HF range. That
is, the resistance equals the reactance at that frequency. So over the
HF range a balun wound on a type 43 core with no air gap or by using
beads W2DU-style looks basically like a resistor. You'd have to have
extremely sensitive equipment to detect any resonance effects.

70 series ferrites have an even lower frequency Q=1 point, along with
more impedance per turn squared, and that's what I mostly use. But a
balun made with type 70 can sometimes get uncomfortably hot if you're
running a kW.

Roy Lewallen, W7EL