[600MRG] top loading

[Rudy Severns]

I think Eric has missed an important point.  

 

True, top-loading only marginally improves Rr but that's not the main point
of top loading, at least on 630m.  What the top-loading does it greatly
reduce the size of the tuning inductor.  In our small antennas the loss in
the tuning inductor is often the dominant loss.  Top-loading improves
efficiency by reducing loss in the tuning inductor.  I have carefully
explained and justified that point in my LF-MF antenna notes on my web site.


 

At some point of course the inductor loss gets low enough and you have to
get to work on the ground loss.

 

73, Rudy N6LF