For solid polyethylene dielectric, 50 ohms is near the minimum
loss point.
Rick N6RK
Paul Christensen wrote:
> The arithmetic mean between 30-ohms (best power handling) and 77-ohms
> (lowest loss) is 53.5, the geometric mean is 48 ohms. The historical
> choice
> of 50-ohms represents a compromise between maximizing power handling
> capability while minimizing loss per unit length, for air-dielectric
> coaxial
> lines.
>
> Paul, W9AC
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