Line loss itself is a comparison of two powers, those entering and
leaving the line. The line loss in watts is the power entering the line
at the input end minus the power leaving the line at the output end.
Line loss in dB is 10 times the base 10 logarithm of the power entering
the line at the input end divided by the power leaving the line at the
output end. These definitions can be and are used for any two-port device.

If you truly didn't know this, it's surely because you've befuddled
yourself with your forward and reflected waves of average power to the
point that you've lost complete track of the fundamentals.

Roy Lewallen, W7EL

Cecil Moore wrote:

Richard Clark wrote:

You are missing coming to terms with Bart's lesson - still.


It's a pretty simple question that, so far, no one has
answered, not even Bart. dB is always a comparison of
one thing to another. To what is the line loss in watts
being compared?
--
73, Cecil http://www.qsl.net/w5dxp