Hello Bill, Group Can you tell us a little more about your test coil? I believe you made it to try to simulate a 50 x 50 loop. I built a coil from Litz wire with about 100 uH and got it to resonate with about 7000 pF. Now to match it and try putting some power into it. What kind of tests have you been doing with yours? PaulC W1VLF "USA"