[TowerTalk] 80M antenna wire size

[jimlux]

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 at 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
>>
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