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Wimpie wrote:
snip From 50 Ohms to 2 Ohms is a small step, so matching can be done with relative low loss. When using an L-match, the loaded Q is 4.9. A series inductance of about 0.82 uH with a parallel capacitor of 8.2 nF will do the matching. Other option is to reduce the value of the top hat series inductance a bit to create a capacitive series component (of about 8.5 nF). Adding a parallel inductor will do the matching. I will just accept that you are correct as I don't want to get into matching at the moment and off the top of my head it sounds reasonable. With 4, 15' radials just 2' above ground, at lambda = 518', I would expect more ground loss, hence higher real part of input impedance. Are you sure your NEC version handles this situation well? I do believe so as I can see significant differences between ideal, good, average, and poor ground. All this was done with average ground BTW. -- Jim Pennino |
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