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[Antennaware] Follow Up - Velocity factor of insulated wire

Subject: [Antennaware] Follow Up - Velocity factor of insulated wire
Date: Wed, 23 Jun 2004 10:59:29 +0200 (MEST)
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first of all thanks for the trigger about the insulated wires.
This started me to do some experiments with my 4nec2 package
in which a few months ago included the possibility to specify
radius- and material info for insulated wires.

Unfortional this showed up there was bug in the internal formula to
create the LD2 card for specifying the distributed L resulting from
the insulation layer. (thanks to RA9MB/UA3AVR and L.B.Cebik for the
additional info about the subject). 

After this version 5.3.9 bug was fixed I modelled a 40 meter dipole
above average ground using 2.5 mm sq. copper wire (radius 0.892 mm) 
with a 0.5 mm thick layer of hard PVC (diel-const about 4.5).

This showed up a resonant length of 10.419 meter for the bare copper
wire and a resonant length of 10.158 meter for the insulated wire, resulting
in shortening factor of about 0.975

Maybe this is of interest.... :-)


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