On 1/24/2014 2:38 AM, Jeff wrote:

I'm sorry Jerry, but you don't know what you are talking about.

Smith Charts do not have anything to do with antenna efficiency or
resonance.
The only thing that Smith Charts does is explain what is happening
inside of a piece of coax X inches long. Note I do not use feet -
since that is too vague.

Whilst I agree with your first point, Smiths Charts do not "explain what
is happening inside of a piece of coax X inches long". They are an easy
way to plot impedances, and show what happens if you *change* the length
of coax, but more importantly they give you an easy way of working out
how to match impedances (with or without any length of coax involved).
They can also display other valuable quantities such as Q.

jeff


They do if you know how to use them properly. For instance, they will
tell you when the reactive portion of the impedance is zero (neither
capacitive nor inductive), which indicates resonance. They will also
tell you the antenna's impedance at a specific frequency. Both can be
used to indirectly determine antenna efficiency.

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Jerry Stuckle

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