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.

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          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.