That's not true of all baluns. The flux in the ferrite core of a 1:1
Guanella balun wound with coax depends on the common-mode current, not
on the differential-mode current; so it's not directly related to the
load Z.
Also, we shouldn't confuse heating with saturation. To quote W8JI: "We
often assume heat means a core is very lossy or is "saturating", but
*t*his often isn't true." " It is almost never core saturation, unless
the core is subjected to very low average power and very high peak power
levels."
Steve G3TXQ
Dr. Gerald N. Johnson wrote:
That's the fundamental problem with tuning trough a balun. If the load Z
is high the voltage goes high and saturates the core which leads to much
loss and heating.
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