I wasn't able to find a suitable BPF combination that worked well for my QDX on 40-15m, and I've instead bypassed it for now with a 1200pf capacitor. This way, the LPF selected is always in line on receive, and I have tried running an external HPF (K9DP BCI filter) that cuts off everything below 3.5 mhz; creating a kind of wideband BPF.? I've played with values in Elsie to make a HPF on the same K9DP board with a 7mhz cutoff, but haven't implemented that yet. That's worked well enough in my US operating. (I know EU areas can have stronger SW BC signals near ham bands)?
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-Nate
N8BTR
