Jim Kelley wrote:
Well, I think he's assuming dissipative loss in both cases. But the 5
watt numbers were assumed, and there's nothing to indicate that the same
piece of transmission line would produce these losses under the
described conditions.

The two transmission lines are completely separate and have absolutely
nothing to do with each other. The conditions are as stated.
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73, Cecil http://www.qsl.net/w5dxp