[TowerTalk] Loading Coils

[Michael Tope]

Wes,

I remember looking into this for a work project. If the phosphorus 
content in the nickel plating is high enough, the relative permeability 
drops to a low value close to 1 (i.e. the nickel alloy becomes 
non-magnetic). If you look at page 156 paragraph (6) Nickel-Phosphorus, 
a higher phosphorus content decreases the conductivity of the alloy. In 
that case, copper plated with a modestly thin layer of low-conductivity 
nickel-phosphorus alloy (say 200 micro-inches) should have an overall AC 
resistance at HF frequencies that is fairly close to un-plated copper 
(see figures 5, 6, and 7).

It would be interesting to get hold of a few of these inductors to see 
how well they perform.

73, Mike W4EF...............

On 8/2/2025 10:15 AM, Wes wrote:
> Actually, I know it's a bad idea, see top of page 151 of the following.
>
> https://www.dropbox.com/scl/fi/w5u2m0qvuwjs0i3vlwdsf/Plating.pdf?rlkey=n99dlrd2joh5548drtczvtsks&st=grysczj9&dl=0 
>
>
> On 8/1/2025 2:29 PM, Wes wrote:
>> I would need some convincing that nickle plating is a good idea.
>>
>> Wes  N7WS
>>
>
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