[Antennaware] Dual fed K9AY

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 
> a
> free-space model. For this structure, the terminating resistance is 
> approx.
> 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 
> ground
> loss. Feed impedance is affected similarly. I considered this the best
> verification of my "Mininec Ground + Loss" model.
> 73, Gary
> K9AY

More information about the Antennaware mailing list