You've made me think about it a lot more now. The AC/DC resistance argument is certainly valid. It does indeed mean that any capacitive field will be captured with less loss than letting it end up in
To All from PA0SE Andy, G4JNT, wrote as a comment on GW4ALG's experiment using aluminum kitchen foil as a grouind screen under his loading coil: Aluminium kitchen foil is much thinner than the skin d
Aluminium kitchen foil is much thinner than the skin depth at these frequencies, so you are getting nowhere near the full screening effect. Many thanks for another clear description of what's actual
Steve and group Aluminium kitchen foil is much thinner than the skin depth at these frequencies, so you are getting nowhere near the full screening effect. Skin depth is given by 503.SQRT(Rho / Freq)
Hi All, Well, it's been drier in Chepstow this week, and we're having a gloriously sunny day today. So I've been doing some more antenna current measurements this afternoon. (If you're getting bored
From Dave G3YMC There has been discussion on the difference in current below and above a vertical antenna's loading coil. I was not going to get involved in this discussion, but when I see some of th
John KD4IDY wrote: I don't recall whether you ever mentioned what the length is of your coil. Is it an appreciable fraction of the overall antenna height? Hi John. The length of the loading coil is 8
Steve, I don't recall whether you ever mentioned what the length is of your coil. Is it an appreciable fraction of the overall antenna height? Also, I seem to recollect that some of the discussion in
Hi All, Many thanks for the advice regarding my 'missing' milliamps, both direct and via the Reflector. Naturally, after getting so many good ideas, I had no choice but to take advantage of the good
Hi All, Today, I made some more antenna current measurements on my 12 m vertical (and my shiny new loading coil), using a thermocouple meter. At resonance, the current into the base of the loading co