So I built a resonant 40 Metre Dipole out of some lovely 3mm diametre hard drawn copper wire salvaged from the telegraph poles that used to run over Mt Dandenong – the wire was kindly donated by VK3GP, a great OM and ‘neighbour’ (same suburb) HAM. I’m pretty happy with it – VSWR < 1.5:1 across the entire 40m band, 1:1 right over the DX window!
I'm fortunate to have an Alinco DX-SR8 that will put out QRP Power of < 1 Watt (adjustable internally), so I 'cheated' and tuned it to resonance by putting out a very low power carrier and manually sweeping the band(s). Some more traditional HAMs might find this a little distasteful, given the unmodulated carrier, but one needs to bear in mind this is EXACTLY what antenna analysers do. Given the very low power levels involved, the technical similarity to automated processes, and the < 5 second sweet time, I cannot see how this approach would be any more harmful than using an antenna analyser – other than the fact that no manufacturer got my money!
Being on the DX! 🙂