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Re: [TowerTalk] 39 +j0 ohms?

To: "towertalk@contesting.com" <towertalk@contesting.com>
Subject: Re: [TowerTalk] 39 +j0 ohms?
From: Máximo EA1DDO_HK1H <ea1ddo@hotmail.com>
Date: Mon, 3 Dec 2018 10:41:23 +0000
List-post: <mailto:towertalk@contesting.com>
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?
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