[Antennas] velocity factor of insulated wire

[Pat W]

Steve, LB Cebik wrote a good dissertation on this subject.  See his web  
site for more
info.  Essentially, it requires knowing the insulation type and thickness.
His solution is to use capacitive loads on wires that are insulated.
Some sample permitivities are:

Material                                        Approx. Permittivity
Polyisobutylene                                             2.2
Polytetrafluoroethylene (PTFE)                              2.1

Polyethylene terepthalate (PET)                             3.0-3.2
Polystyrene (PS)                                            2.5
Polycarbonate (PC)                                          2.8-3.0
Polysulfone (PSU)                                           2.8-3.2
Polypropylene (PP)                                          2.2

The following information was extracted from LB Cebik at:
http://www.cebik.com/amod/amod83.html

  Pat W0OPW

On Mon, 24 Oct 2005 17:16:04 -0500, Steve-W0OOW <w0oow at piperscreek.com>  
wrote:

> Does anyone know the velocity factor of insulated wire?  I would assume  
> the
> standard formula of (984*(N-.025))/fMHz would need to be modified.
> Thanks,
> Steve
>
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-- 
Regards - Pat