[TowerTalk] How to calculate aluminium transmission line impedance?

[Tonno Vahk]

Thanks to everyone who answered and particularly to Rick as this was the calculator I was looking for.

It is surprising to see that the transmission line calculator in EZNEC which uses round wires gives Zo as 139 ohms for wires of 20mm diameter and 15mm spacing.

While with square conductors it is indeed 115 ohms. Quite a difference but of course logical as well:)

73
ES5TV

On 10. Oct 2022, at 06:26, Lux, Jim <jim at luxfamily.com> wrote:

On 10/9/22 7:49 PM, Richard (Rick) Karlquist wrote:
> See:
> 
> https://hamwaves.com/zc.square/en/
> 
> Running this gives a value of about 115 ohms.
> 
> The fact that it is aluminum doesn't affect Zo 


it would affect the loss, but not Zo.  There might be some sort of weird small change due to skin effect, but it would be "tiny".


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