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From: "Alan Melia" <alan.melia@btinternet.com>
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Date: Sun, 29 Apr 2007 18:33:38 +0100
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Subject: LF: 500 ERP calculation Spreadsheet
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Hi All, this geriatric ol' twit made another mistake !! Thanks to Peter
G3VVT who bother to check my answers again Kraus ( I cant argue against that
!!) another small error has surfaced. It is to do with the "form-factor"
which should have been squared because it refers to the real height of the
vertical which is squared in the equation for Radiation Resistance. As it
happens it make a very small difference to most people who have a top length
of equal or greater than the height because then the FF is close to unity
( and unity squared is unity !!) However I did issue another sheet to a few
who were working with no top load, it is on aerials like this the error is
most relevant. Fortunately it reduces the Radiation resistance and allow you
to run even more aerial current before exceeding the -10dBW !! The new
version is now loaded to my web site
http://www.btinternet.com/~alan.melia/programs.htm
And I will add a reference to enable the other version (ERP2.xls) to be
downloaded.
Sorry pardon, just crank the current up a bit !!
Cheers de Alan G3NYK