Hi Hans,
The QDX-M seems a great next step - the idea of a cleaner and more efficient build is very appealing especially at the frequency extremes.
I would love to know more about exactly what the obstacles to 6m are - I assume mainly physical tolerances on capacitance and inductance?. I'm only just scratching the surface of my QDX 80m-20m v4, but a single-band 6m version would be VERY difficult to resist. The magic band has always seemed exactly that, but it also has a strong pull of nostalgia for me as the very first antennas I ever built were for TVDXing the old 405-line band 1 signals in the early 80s. I don't think I've seen you comment on 6m much before, apologies if I have missed something in searching.
Echoing some other threads I wonder whether it would be possible to assemble a canonical windings and capacitance table for the BPFs and LPFs to allow people to custom-build variations of the multiband versions - e.g. build a 60/40, 30/20, 17/15 version and set the band config accordingly. I'm not suggesting offering kits like that - an inventory nightmare - but to find their own components if necessary. You'd obviously be limited to the 3 LPF paths (or 1 for QDX-M) and I assume the bands would have to be contiguous to keep the BPF sane. Otherwise is it just a sliding scale to choose from?
Just thinking aloud rather than proposing anything new - I know how easy it is to add ideas when it's not your list to deliver!
73, Henry, M7FYI
