On Sat, 2008-07-19 at 05:41 -0700, Jim WA9YSD wrote:
> Interesting what it says is this publication http://www.somis.org/bbat.html
> He tells about the Sham of baluns and fully supports current baluns.
> Does not mention L networks as to why it will not give you the improper Q
> match like some tuners do with a 1:1 SWR. Or did I miss that?
> Keep The Faith, Jim K9TF/WA9YSD
While his understanding of impedance matching and filtering networks is
a little off the wall, the concept of a balanced tuner with the balun at
the 50 ohm side is a good one that keeps from abusing the balun to get
excess balun losses or harmonic generation from saturating the core. And
as a practical matter, the balanced tuner beyond the balun works quite
well even if not physically balanced.
Many years ago in an AC circuits class talking about pi networks as
filters, I asked the grad assistant about impedance matching with pi
networks. He'd never heard of such a thing. So the concepts can be a bit
different. After a few years in high power transmitters, I learned much
about impedance matching and loaded Qs. There are short cuts, but
sometimes they are shorted and have to be understood to know when they
73, Jerry, K0CQ
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