On 10/21/2013 2:26 PM, Steve Hunt wrote:
It's worth mentioning that Jim's method needs the dipole to be at a
reasonable height - 40ft or more - to avoid having a low resonant
feedpoint resistance. Once you go much lower than 40ft, and the
resonant impedance falls below about 55 Ohms, the SWR will stay
*above* 2:1 all across the band.
That depends a lot on soil characteristics. Here in the very rocky
mountains of Northern California, and in sandy areas, low dipoles have a
somewhat higher feedpoint Z at resonance. Put them at the some height
over very good soil and Z drops considerably.
73, Jim K9YC
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