Topband: Inverted L improvements - Part 3 (now with data)

Paul Christensen w9ac at arrl.net
Tue Jan 22 10:13:39 EST 2019


>"I would think adding radials would lower the Radiation resistance.  Also,
the SWR curve should narrow as ground losses are reduced;  since the effect
of ground loss resistance swamping the results lessens."

The base resistance, not the radiation resistance is lowered by adding in
radials.  At resonance, the antenna's feed-point equivalent circuit is two
resistors in series:  Rr for the radiated component, and Rg for the loss
component.  By lowering Rg, efficiency increases and feed-point resistance
is reduced when additional radials are added.  

Paul, W9AC



More information about the Topband mailing list