[TowerTalk] EZNEC/AutoEZ Shunt Coil Modelling for Yagis

[Wes]

You should probably be using parallel RLC loads in parallel with the source.  R 
+ jX loads are not frequency sensitive, you get the same R and X at every frequency.

In the EZNEC Help file see "The RLC Loads Window" page and the "Load 
Connections" page.

Wes  N7WS


On 3/8/2021 2:00 PM, David Needham wrote:
> I have heard we have several modelling experts out there. I have purchased
> both EZNEC+ and AutoEZ and adapted a 20-15-10m Triband design for separate
> feedlines. I am matching the impedance with shunt coils across the driven
> elements. I built the coils using a coil calculator then tweaked them to
> the correct value with my Rig Expert analyzer. I didn't get anywhere near
> the expected result of the model with the real antenna.
>
> I modeled the shunt coils as R+jX loads connected in parallel to the center
> of each driven element, but am guessing that wasn't the right way to go? Is
> anyone able to point me in the right direction? I am trying to get this
> Yagi ready to go for the CQWW WPX contest at the end of this month.
>
> If you reply to me off list,I will send the AutoEZ/NEC file I built for the
> model.