On Wed, 18 Mar 2009 08:38:46 -0600, Dr. Gerald N. Johnson wrote:
>The higher power is saturating the core of the balun. One of the hazards
>of tuning through the balun.
Yes, very likely. There are several very different things called baluns. The
one in antenna tuners is a transformer, so 100% of the transmitted power is
in the core. Very likely to saturate with high power, heat, distortion.
Another VERY different thing that is CALLED a balun is really a common mode
choke. Put a bunch of ferrite cores around coax, or wind a bunch of turns of
coax through one or more ferrite cores. Those are common mode chokes,
commonly (wrongly) called "current baluns." But when done well (enough turns
to have a high enough choking impedance), they work VERY well.
73,
Jim Brown K9YC
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