[TowerTalk] Loading Coils

[David Gilbert]

ChatGPT mostly agrees with you, except that it says that nickel with a 
high phosphorus content is almost impossible to solder to even when 
using an aggressive acid flux.

Dave   AB7E


On 8/2/2025 7:54 PM, Michael Tope wrote:
> 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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