[TowerTalk] OT: Inductor Calculator

[Wes]

For insight about silver plating see: http://k6mhe.com/n7ws/Plating.pdf

I could tell a war story about nickle under gold on an X-Band waveguide IMPATT 
diode test oscillator.

Wes  N7WS

On 2/27/2019 3:11 PM, jimlux wrote:
>
>  And how to get something silver plated once out of high school chemistry 
> class I don't know?
>
> - Silver plating doesn't affect the RF resistance very much unless the silver 
> is VERY thick - particularly at 2 MHz.
> Copper skin depth at 2 MHz is 1.82 mils (46.1 microns)
> Silver skin depth at 2 Mhz is 1.77 mils (44.9 micron)
>
> Resistivity is 1.59 for silver, 1.68 for copper
>
> QQ-S-365, ASTM B700 silver plating thickness is .05 mil, 13 microns
>
> Complicating this is there's usually a nickel flash/strike plate under the 
> silver, to prevent silver/copper migration, and nickel is magnetic and lossy.
>
>
> Maybe you might want to put a silver plating on the inside of Aluminum 
> waveguide at high frequencies.
>
> But for low frequencies, you're probably better off just making your conductor 
> 6% bigger in diameter and that will provide lower overall AC resistance.
>
>
>
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