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:

http://www.navy-radio.com/manuals/shore-vlf.htm

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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