On 1/3/20 9:50 AM, Jim Miller wrote:
Is the copperweld copper thickness under consideration sufficient for the
skin depth of RF at 160m?
cladding of 40% IACS wire is around 10 mils, as I recall, for AWG 10. So
10% thickness.
AWG 16 would be 50 mil diameter, so the cladding would be 5 mils.
Skin depth in copper at 2MHz is 1.8 mils.
Not perfect, but pretty close to all copper.
One should really model the steel aspect (since skin depth also depends
on permeability), however, since the cladding is 2- 2.5 skin depths,
almost 90 of the current is in the cladding, so the losses in the steel
are going to be small.
Jim ab3cv
On Fri, Jan 3, 2020 at 12:48 PM David Gilbert <xdavid@cis-broadband.com>
wrote:
Ground losses are minimal for a tuned radial ten feet above ground, but
I wasn't trying to make a rigorous model in the first place because I
don't know the specifics of N2TK's setup. You are welcome to make your
own model if you think my wire loss conclusions for the 18 gauge
Copperweld are in error.
73,
Dave AB7E
On 1/3/2020 10:26 AM, Jim Brown wrote:
On 1/3/2020 9:15 AM, David Gilbert wrote:
I modeled a simple 80m vertical with one elevated radial 10 feet
above ground
Not the best model for evaluating the effect of wire resistance --
ground losses dominate. Better to model with a GOOD radial system.
73, Jim K9YC
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|