LF: ERP spreadsheet ammended

To:	<[email protected]>
Subject:	LF: ERP spreadsheet ammended
From:	"Alan Melia" <[email protected]>
Date:	Wed, 7 Mar 2007 15:56:10 -0000
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Hi all Jim has indicated that the formula I used to calcualte the radiation
resistance is in error. I claim immunity for ridicule as the formula is
quoted in page R-9 of the Admiralty Handbook vol 2 1938 !! :-))

However he also says that I have used the total radiated power rather than
the more strictly defined ERP which relates to a mythical dipole. I aver
that this is more meaningful for very short amateur LF aerials (and its in
our favour !!) My stance is somewhat supported by the measurements made by
Jim and Christer SM6PXJ several years ago on 136kHz where they found the
measured fireld strength were about 6dB below those expected theoretically.
Thus the aerial current calculation may yield a figure that is too high in
"ERP" but the field strength generated is expected to be correct in
practice.  That is my defence, melud !! I am a "reasonable man".

An ammended version has been posed to my web site

Cheers de Alan G3NYK

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