On 8/23/2012 3:22 PM, W5DXP wrote:
On Thursday, August 23, 2012 9:36:23 AM UTC-5, John S wrote:
An antenna for which there is a sharp peak in the power radiated or
intercepted by the antenna at a certain frequency,

This is not correct.

At 14.32 MHz a certain dipole accepts 159.2w from a 100v source into a resonant 62.8 ohm feedpoint impedance. At 14.25 MHz, it accepts 160.2w from a 100v source into a non-resonant 61.9-j6 ohm feedpoint impedance. So it appears that you are technically correct but maybe splitting hairs.
--
73, Cecil, w5dxp.com


You used a fixed 100V source. If you can do that, I can use a fixed 1A
source. In that case a resonant antenna of 62.8 ohms feedpoint
resistance will radiate very nearly 62.8W. An antenna with a feedpoint
impedance of 62.8 + j50 will radiate very near 62.8W.

There is no sharp peak in the power radiated whether at resonance or
not. The definition as it stands is incorrect.