Pierre,?
? ? ?The BPF sweep problem on 20M on High band QDXs has been there for most people, and L12 changes to fix it haven't been established that I've seen. Doesn't seem to be much you can do about it, but make sure the audio level on that band is appropriate in WJST-X..and seems to still work pretty well on 20M for me.?
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As far as power output, the middle set of toroids is for 15/17m... And I've found those to be a tradeoff...messing with them to increase power on 15m may mean a slight decrease on 17m.?
If you study the QDX manual and schematic, you can see which toroids affect which bands. There are 3 sets of LPFs, and they are assigned to different bands in the terminal application.?
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-Nate
N8BTR
