[TowerTalk] 39 +j0 ohms?

[Wes N7WS]

No, you just need to calibrate at the far end of the coax. 

Sent from my iPhone

> On Dec 2, 2018, at 1:27 PM, Jim Brown <jim at audiosystemsgroup.com> wrote:
> 
> Where are you measuring?  You'll only get the actual impedance measuring right at the feedpoint with a very short piece of coax connecting the analyzer.
> 
> Now, it IS possible to transform a measurement made at the end of a long piece of coax to the feedpoint Z, but to do that you need to save the data to a file and export to software like AC6LA's ZPlots or AE6TY's SimSmith. AND you need to know the length of the feedline, know the exact type of coax, and plug both into the software.
> 
> 73, Jim K9YC
> 
>> 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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