[Elecraft] high-power tuner

[Rick Stealey]

There seems to have been no answer as to how to accurately measure the loss in a tuner.  
Here is a solution but requires two tuners or at least one calibrated one that could be
used to measure others.
Take first tuner and tune it into the mismatch, say 600 ohms.  Use an antenna analyzer.
Then remove the load, and connect another tuner to the output of the first (back-
to-back - antenna port on first to antenna port on second tuner.)  Then put a 50 ohm 
load on the second tuner where the transceiver would be connected, and tune the second 
tuner to a match.  It will have the same settings as the first tuner, complete symmetry.
Then measure the power in the 50 ohm load  to get the loss.

Since both tuners are matching the same load, and the system is symmetrical the
loss contribution by each tuner is half.  Repeat for other types of loads, and now
you have a calibrated tuner to use with any tuner you want to test.

Rick  K2XT