Hi Jim,
House wire has around 5% effects. I always say to use 95% VF as average for
that kind on insulated wire.
But enamelled copper wire I understand will be much less, but even 1% on a
dipole for 80m band will be a noticeable difference.
I had no idea about IS card.
Yes, I have NEC4 and I can see that card.
I'll try what you saying to see the difference.
As always, thank you very much.
73, Maximo
<http://foro.ea1ddo.es/>
________________________________
De: TowerTalk <towertalk-bounces@contesting.com> en nombre de jimlux
<jimlux@earthlink.net>
Enviado: viernes, 24 de abril de 2020 12:44
Para: towertalk@contesting.com <towertalk@contesting.com>
Asunto: Re: [TowerTalk] Enamelled copper wire in NEC
On 4/24/20 4:22 AM, Máximo EA1DDO_HK1H wrote:
> Hi,
>
> I use to set my wire antennas as plain copper in when modelling in NEC.
> In the case I would like to get closer to reality and set enamelled copper
> wire in NEC... I don't know what kind of properties to use, for the enamel
> layer.
>
> Please, Any advice here?
>
>
Enameled wire (actually some sort of plastic coating) is pretty thin. I
don't know that it would make much difference in the RF properties at HF
frequencies. Something like AWG 12 "house wire" or the ever popular
lamp (zip) cord has a much thicker coating.
if you have NEC4 which does insulated wires, you can use the IS card to
set the properties of the "insulating sheath". Most plastics have an
epsilon of around 2-3, and very low conductivity (so use something like
1E-6 or 1E-20)
IS 0 tagno segno1 segno2 epsilonr sigma radius
See page 58 in the NEC 4 manual
http://physics.princeton.edu/~mcdonald/examples/NEC_Manuals/NEC4UsersMan.pdf
here's someone discussing it:
http://on5au.be/content/amod/amod50.html
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