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Old September 19th 05, 05:29 PM
Richard Harrison
 
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Cecil, W5DXP wrote:
"Note that those are not the feedpoint impedances.".

Well, the imprdance I qupted was the radiation resistance, which is the
voltage to current ratio of an antenna at the maximum current point in
the antenna. I was just too lazy to post the complete Table given by
Bailey.

Only when the order of resonance in a center-fed dipole is odd, 1st,
3rd, 5th, etc, is the feedpoint resistance the same as the radiation
resistance. In odd-ordered resonances, the antenna feedpoint resistance
is te same as the radiation resistance. In odd-orfered resonances, the
antenna feedpoint is at s current loop.

In even-ordered resonances, the value of the feedpoint resistance is
equal to the feedpoint impedance squared, divided by the radiation
resistance value. Bailey has worked it all out for us.

Best regards, Richard Harrison, KB5WZI

 
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