I have done some experimenting with RFSIM, modelling the existing BPF, and analysing it. I have come up with an easy way to have some filtering, without just shorting out the BPF.
If you put a 470pf from the antenna input to the junction of L3 and C6, you will get a reasonable BPF at 80m.
Change it to a 6.3uh inductor , and you will get 30m. A 2.2uh will give you 20m.
These are not optimal as in the original nice 40m BPF, but an easy way to get at least some filtering from BCB and higher up. See attached pics.
P.S I have tried it, and it works great.!
Cheers
