[TowerTalk] 39 +j0 ohms?

[Máximo EA1DDO_HK1H]

You need to see what X shows.
When X=0 that is the resonance point. It is how you know if it is long or short, or just in place.

After that, while X=0 (or around), it is when you check R. That is the real impedance, it is the one you will need to transform to 50 OHm.
Both together, R and X will calculate final Z.

The theory says a 1/4 vertical in perfect condition will be around 36 Ohm (R=36 OHm, X=0), but that perfect point is difficult to reach.

You can export the Touchstone file from your RigExpert and import it to ZPlots Xtra and get extra plots;

Zplots_Xtra.xlsm<http://www.puertobalsillas.com/radio/Balun_Guanella_4_1/Zplots_Xtra.xlsm>

73, Maximo - EA1DDO

________________________________


On 12/2/2018 12:07 PM, Jamie WW3S wrote:
> trying to understand a 40m vertical, my Rigexpert analyzer has Z, X, R and C.......when I measure the vertical at 7.125 (target freq) the SWR is 1.3:1, but the Z is 50 ohms, I’m told the impedance needs to be 39+j) ohms? How can I read that with my rigexpert.....I can get around 39 ohms at 7.400.....is my vertical too long, or too short?
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk at contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk


_______________________________________________