On Sun,6/5/2016 1:20 PM, Timothy Holmes wrote:
I would like to model them so that I can properly adjust them to see if it
is even worth my time, and what the performance will roughly look like
To model the antenna, you will first need to measure the traps to find
their complete equivalent circuit. A trap is fundamentally an inductor
with series resistance in parallel with a capacitor with parallel
resistance. Near resonance, they simplify to parallel R, L, and C, but
above and below resonance, we need to know the R in series with L,
because these values affect performance on bands below the resonance of
the trap. And, of course, both Rs vary with frequency, thanks to skin
effect.
73, Jim K9YC
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