Hi William,
The RF sweeps combine the LPF and the BPF (L12 and one of the selected capacitors).? The most impact is from the BPF.? If the LPF is correctly built, it will be significantly above the operating frequency.? With that said, I do not use the RF sweeps to tune the LPF.? That is done by compressing or expanding the turns on the two toroid inductors in the filters.? Both can impact the output power, though, for me, the most impact was with the L2, L3, or L4 toroids.
Hans has a video on tuning a QCX LPF that can apply to the QDX.? The QCX has more toroids, but the principle is the same.
73
Evan
AC9TU
