The very "short" one port equation does get meaningfully close, but diverges with frequency. I haven't computed the impedance deviation yet, so it's too soon to pass judgement. My spreadsheet is getting uncomfortably out of control; and as I am understanding more, it expanded and has become difficult to manage. Before I continue from here, I need to do a refresh/rewrite to get it better organized and to keep it from becoming corrupted. This may take a few days.
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73
Gary, N3GO
