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@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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