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Old 13th Feb 2018, 12:01 pm   #47
G8HQP Dave
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Join Date: Sep 2008
Location: Solihull, West Midlands, UK.
Posts: 4,872
Default Re: Valve AM transmitter (very very low power!)

Quote:
Originally Posted by kalee20
I'm guessing that aerial capacitance increases with wire diameter, and when you do the series-parallel equivalent transformations you get the variation laws you describe?
Yes, capacitance increases with wire diameter. The length^2 variation of the series resistance comes from considering radiation. The 1/length^4 variation of the parallel resistance comes from a combination of the series variation, the capacitance (varies something like length, for a short antenna) and then the series-parallel transformation.
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