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LF: Apparent Error in "LF Today", g3xdv, formula page 83

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Subject: LF: Apparent Error in "LF Today", g3xdv, formula page 83
From: "Ya`akov N. Miles" <[email protected]>
Date: Sun, 17 Jul 2005 10:46:43 -0700
Delivery-date: Sun, 17 Jul 2005 18:47:28 +0100
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I notice that the book "LF Today" put out by Alex Dennison, g3xdv
appears to have missed a parameter its loop radiation resistance
formula as stated on page 83

Rr = 320 * (pi**4) * A*A/(Wavelength**2)

This equation does not scale with wavelength even if the area  A
is scaled proportionately with the Wavelength.  I believe this should be

Rr = 320 * (pi**4) * A*A/(Wavelength**4)

This can be simplified (for circular loops of diameter D)

Rr = 17228. * ((D/Wavelength)**4)

and this equation gives answers which agree with published data elsewhere.

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