I just finished building my second QMX+ and the 160m filter sweep had rather ugly oscillations on it.? L506 in the 160m filter has so many windings that the start and end windings had butted against each other likely adding some parasitic capacitance in parallel.? I found that by creating a small gap between the start and end winding the sweep greatly improved.? This also improved the sweeps on almost all other bands although to a lesser degree.? I went back to my first QMX+ (which did not have ugly oscillations on the 160m sweep) and added the gap and also noticed improvement in the sweeps on almost all bands.? Has anyone else experienced this?
Andy KY4DF
