[Elecraft] Using XG1 to measure feedline losses

[kg4htt at juno.com]

Right now I'm using an end fire array antenna that I also can use as a 52
ft. circumference loop.  Given the very high SWR on the feedline,
especially when running the loop on 40M and 80M, I recently swapped out
the 18 feet of 450 ohm "window" ladder line between my tuner and the
loop, and replaced it with a homemade ladder line made from 3/8" outside
diameter copper refrigerator tubing.  The spacing between centers of the
tubing is 3/4 inch.  I immediately noticed much stronger signals after
doing the feedline swap.  That had me wondering just how much loss I was
experiencing with the ladder line, in comparison to my current feedline. 
 I was thinking about how I could measure this.  I thought about using
the XG1, attaching it to a 10 ft. dipole made of insulated wire, then
taping the dipole to the center of the loop opposite the feedline, using
the XG1 to generate a weak signal onto the antenna.  Then I would measure
the signal strength at the K2 speaker output, going through the
tuner,(after having first tuned up the antenna to 7.040 without the XG1
attached).   Then I would repeat the same experiment with the different
feedline and then compare the difference.  One of my concerns would be
the impact on the XG1 by hooking it up to a 10 ft. or so dipole, and the
fact that it would not be transmitting into a 50 ohm load.  

Is there an easier way to do this?   The loop was doing fine with the
ladder line, I used it for the ARCI Spring QSO Party, but I'd like to
improve on it.

Vic
KG4HTT