Oh, yes, that was a nice trick.? I figured out the problem with 15m is that the cutoff frequency is too low, and 21.074 MHz is actually more than 3dB down.? I did the transmitter test at 19MHz, well inside the passband, and got 4W.? So I need to tweak the toroid to push the cutoff frequency up.? The same might also be true, to a lesser extent, on 12m and 10m.
Eric
