However,
files for radio amateurs contain very limited data on operation
and design of the helical antennas. It is may be explained
(in my opinion) by the fact that the helical antenna sometimes
cannot be repeated by amateur with predicted result and
simulating antenna software that available for amateur and
still have limitations that cannot allow calculating a shortened
helical antenna in right way. You may still found in the
internet some old software for simulating HF helical antenna
that may run on Windows XP- 32 bit (for example, classical
G4FCQ simulating software, References
1) however the modern Windows 10 kills all of
the old simulation software.
This article
gives some explanation to the practical design and to some
theory of the HF helical antenna. Hope it helps radio amateur
to do experiment with the antennas. The article was written
by me based on my practical experience and experiments with
helical antennas. Of course, these experiments still could
not provide complete clarity on all questions of the theory
of operation of HF helical antennas.
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Moreover,
I understand that the methodology of mine experiments have
been criticized, the equipment used in the experiments were
home-made that could be also based for somebody for criticizing
and denied some of mine conclusions. However in the experimenters
I have got repeatable results when designing shortened HF
helical antennas and found some patterns in the design and
operation of the HF helical antennas. On the base I provide
recommendations on the design and use of the HF helical
antennas in amateur conditions.
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I hope that
radio amateurs, who will continue do experiments with HF
helical antennas, will be able to obtain more detailed data
on the operation of the antennas and on the base design
HF helical antennas with predictable parameters. And, of
course, do complete the article.
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