On Saturday 23 September 2017 11:18:21 you wrote:
> Knowing the effective height of a Marconi antenna is essential in the
> calculation of radiated power /antenna efficiency at LF/MF. The
> formula for this includes figures for the capacitance to ground of
> the vertical and horizontal wires. The result being somewhere between
> 50% and 100% of the actual height.
> As long as I have been interested in LF - over 20 years - I have seen
> (and used) a figure of 5pF/m for the capacitance of the horizontal
> wire and 6pF/m for the vertical wire. However, I have recently been
> asked how this figure originated, and must admit that I don't
> remember. Was it amateur experimentation, or a professional source
> such as the Admiralty Handbook? The very first amateur UK LF book, a
> slim spiral bound volume by Peter Dodd, may have the answer but I
> don't have a copy. Peter's bigger follow-up book, The Low Frequency
> Experiemnter's Handbook, published in 2000, already takes these
> figures as understood.
> Can anyone help, please?
> Mike, G3XDV
The navy VLF books are downloadable from this link:
But the VLF bible in my opinion is this book, with wires capacity formulas and tables:
Arthur D. Watt, VLF Radio Engineering, Pegamon Press 1967
Also the capacity of 2 or more parallel top loading wires are here.
73 de Claudio, IK2PII
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