[Antennaware] Dual fed K9AY
k9ay at k9ay.com
Wed May 27 11:42:47 PDT 2009
Both feed and termination will see the same ground loss, so Rterm is 500
ohms minus the total ground loss, not half of it.
> To expand ... Although the ground connection is sensitive in the models,
> there is no such abiguity when using a mirror image of the loop to create
> free-space model. For this structure, the terminating resistance is
> 1000 ohms, which is 2x (Rterm + Rgnd) where Rterm is 390 ohms and Rgnd is
> 100 ohms. It also says that Rterm is actually 500 ohms minus half the
> loss. Feed impedance is affected similarly. I considered this the best
> verification of my "Mininec Ground + Loss" model.
> 73, Gary
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