[TowerTalk] 80 Meter yagi question

[Richard (Rick) Karlquist]

On 10/11/2017 10:11 AM, Jim Thomson wrote:

> ##  Aluminum only  conducts  60% as good as copper.  .25 inch OD copper  =  .417 inch OD  aluminum.

> Jim   VE7RF
> 

That is only true at frequencies below which skin effect is
significant.  For RF frequencies, you need to take the
square root of 60% which comes out to 77%.
1/4 inch copper = 5/16 inch aluminum.

Rick N6RK