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helix.doc
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1993-01-22
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HELIX.EXE v. 2.0
Copyright (c) 1984 - 1993
Holger Granholm, OH0NC
Norragatan 7 A 3
SF-22100 Mariehamn
(Finland)
Phone: (358)-28-13068
BBS: (358)-28-13068,,63
Legal:
THIS IS NOT FREE SOFTWARE! IT IS BEEING DISTRIBUTED ON THE
SHAREWARE BASIS. IF YOU USE THIS SOFTWARE, THEN YOU ARE EX-
PECTED TO REGISTER IT WITH THE AUTHOR. THE $ 10.00 REGISTRA-
TION SHOULD BE MAILED TO THE ABOVE ADDRESS. REGISTRATION
WILL COVER THIS VERSION AND ALL FUTURE UPGRADES.
HELP SUPPORT SHAREWARE AUTHORS!!!!
Changes:
v1.0
The Program was first created on an Sinclair ZX-81 in 1984.
v1.4
It was then ported in 1986 to a CP/M computer.
v1.8
1988 it was again ported, this time to an AT-class MS-DOS
computer.
v2.0
The program is ripe, and has not needed any upgrades as far
as the original concept is concerned, (the author hates to
re-invent the wheel). The only changes that have been made
are concerned with the User Interface. The latest change to
the interface only makes it look nicer.
===========================================================
Overview:
HELIX (or helically wound) antennas are very popular for EME
(Earth-Moon-Earth) and satellite communications. They give
the user the best of two worlds, both vertical and horison-
tal polarisation with a single antenna.
When two HELIX antennas are working against each other, the
gain is about 3 dB higher than would be the case if one of
the antennas would be a single polarisation antenna.
This program was born out of the need to be able to calcu-
late the various factors influencing the design of helical
antennas.
The only important thing to know after the calculations, is
whether the antenna should be right- or lefthand polarized.
This of course influences the construction of the antenna.