The normal mode helix was covered in some detail in a 1974 (!!) edition
of Radio Communication with a set of empirically determined equations
for calculating resonance and winding dimensions. Seem to remember it
was by the famous D A Tong, but I may be mixing it up with another
article. I found the equations to be a good starting point from which
to fine tune helials for HF. Used to have a copy of that RadCom, and
it may still be lying on a shelf somewhere.
From: g3ldo [mailto:[email protected]]
Sent: 2001-04-06 21:06
To: [email protected]
Subject: LF: Helical antennas
Does anyone have a description of how the helical antenna
(not the axial
mode antenna), like the one built by Toni HB9ASB, works?
Tony made a lot of tests and concluded that most of the
radiation came from
the helical coil rather than the top loading, see page 58 of the LF
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