Hi Alan,
just one more remark:
The formula used assumes a constant current for the entire loop, what
is valid only for small loops (compared to the wavelength).
In one article I found that the upper limit was a loop circumference
of lambda/5, thus 120 m at 500 kHz.
So at the height of 10 m the length should be no more than 50 m (@ 500 kHz).
73, Rik ON7YD
At 15:26 11/05/2007, you wrote:
Hi all, another whoopsie !! As a result of the sudden interst in loops and
thanks to help from Rik, we spotted an error in the loop Rrad calculation (I
thought it looked a bit small !) It transpired I was using the 136kHz
wavelength as a constant when I imported the equation from another sheet,
and I did not consider anyone using loops on 500k at the time so did not
check the results. I hope I didn't disuade anyone building a 500kHz loop. At
least the loop v Marconi "L" comparison is correct now. The new sheets have
been uploaded and have two lines of correction declared, above the
descriptive text.
http://www.btinternet.com/~alan.melia/programs.htm
Make sure you hit REFRESH as some browsers seem not to see new content with
the old file name. The file names have been kept the same to link with other
pages.
Cheers de Alan G3NYK
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