Further to the LPF modification for 80m, I have done more experimenting and found that if you switch in a 470pf cap across L6 in the LPF, you will get about 37db attenuation on 40m, with a nice rolloff from 80m.?
The attenuation on 80m is negligible. See the attached graph.
Cheers
John de VK4JWT
radiomanjwt
