Richard Fry wrote:

...
Thanks, but a monopole of every electrical length is still a monopole, and
they ALL require a very good r-f ground or counterpoise for best
perfromance.

While your use of "best performance" may leave you wiggle room, however,
that statement is, for the most part, BULL PUCKY! 1/2 wave monopoles
have little dependence of a full counterpoise or ground for, at least,
acceptable performance. Anyone playing with them on wood/fiberglass
fresh water marine craft will have that realization and knowledge.

Not to worry. Mr Vincent and I have exchanged comments already. I sent him
some NEC data and analysis which by his replies he did not appear to
understand. He seemed to think that I was trying to use NEC to analyze his
DLM designs -- saying that such was impossible.

OH MY GAWD! Well then, you must forgive the man, he simply didn't
realize who he was dealing with!!! Krist, all he is surrounded by there
with is masters, doctorates, scholars, etc. He made the simple mistake
of NOT ignoring them and paying attention to your words of great wisdom
.... now let me see, what is your credentials--doctorate in amateur radio?


But I wasn't attempting to do so. My NEC data only showed that his 3.5 MHz
standard DLM didn't perform very well as compared to a conventional
1/4-wave, unloaded monopole with a good r-f ground, and was about the equal
of a conventional monopole of the same physical height using the same r-f
ground -- which, of course, differs from his and the official URI test
report claims for the DLM.

RF

I don't believe any of the modeling programs are "aware" of what
dynamics are causing the DLM to outperform expected/modeled results--or,
simply put, if all you can do is model and naysay--the antenna sucks.
Build one ACCORDING TO VINCENTS DATA and you will use it ... spacing
between coils is critical, values of the coils are critical, and the
ratio of inductance between coils is critical--by critical, I mean these
factors GREATLY depend on following Vincents design closely--the antenna
is HIGHLY SCALABLE, i.e. every aspect of a 1/2 wave is 2x that of a 1/4,
etc.

When I spoke to him, he was a bit "aggravated" by know-it-all-hams who
had personally attacked him--none of which had apparently built a
prototype first! When did you say you had spoken to Mr. Vincent? ROFLOL

Regards,
JS