Roy Lewallen wrote:
From my previous posting, the power into the line is 50 watts and the
power out is 25 watts.

To find the loss in dB, take the ratio of input to output power, that
is, 50 divided by 25, to get 2. Now take the base ten logarithm of that.
(The Log key on a calculator is what I use for this complex operation. I
get about 0.301. Finally, multiply that by 10, to get 3.01 dB. 3 is
close enough for most of us.

The RF technician I worked with at Intel was directed by his manager to
report all powers in dB referenced to the signal generator output which,
in the above example, was 100 watts. His figure for dB loss in the transmission
line would be different from yours and you would be the one getting a bad
review for not following directions.

Like I said earlier, your refusal to define the powers being ratio'ed
may spread confusion instead of information.
--
73, Cecil http://www.qsl.net/w5dxp