Don k4kyv wrote:
I would be interested in looking at any actual experimental data compiled
to quantify ground losses, using physical antennas fed with physical rf
watts with data collected using a variety of physical ground planes.
In 1937, Brown, Lewis and Epstein of RCA Labs published a benchmark
experimental study of this in the Proceedings of the IRE - still covered by
copyright. But clips from it have been available on line for a long time.
The NEC4 study linked below shows the affect of earth conductivity on the
system radiation efficiency of an electrically short monopole on 160m, using
32 x 10m buried radials. The fields radiated by this system range from 6.8
dB to 9 dB below those of that monopole on that frequency using the same
applied power, and having no losses in the loading coil or r-f ground
connection.
http://i62.photobucket.com/albums/h85/rfry-100/10m_Vert32Buried_Radials.jpg
RF
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It is undesirable to believe a proposition when there is no ground whatsoever for
supposing it is true. — Bertrand Russell
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