[Amps] Cool Amp Silver Plating

[Roger]

On 3/1/2014 5:40 PM, Dr. David Kirkby wrote:
> On 1 Mar 2014 20:57, "John Lyles" <jtml at losalamos.com> wrote:
>>
>> We use it often at work. It's expensive. It doesn't do squat for
> improving the conductivity of surfaces like cavities and inductors for RF
> current, as Peter pointed out. That requires at least 3 to 5 times the skin
> depth
>
> What controls the thickness of the cool amp?  Can one not repeat the
> process to get a thicker coating or does that not work?

I believe it's an ion exchange, which would only be a few atoms thick. 
Once the base metal is completely covered, I doubt repeated applications 
would add much as the mechanical rubbing of the material no longer 
contacts the base metal.

>
> If fixed,  do you know what the thickness is? I was wondering if it would
> be useful for 10 GHz, where the skin depth is a lot less than at VHF/UHF

Searches reveal several sources saying 0.0025mm or 9.84 * 10^-5" or 
0.0000984" if I placed the decimal correctly.
0.0025mm/25.4mm per in = 9.84 * 10^-5 in.
  I can not verify the authenticity of those numbers.

http://www.docin.com/p-533501287.html  Chinese..I think. Scroll down in 
the English window past the Bellvile washers and there is a CoolAmp page

http://www.thew.com.au/index.php?option=com_aceshop&Itemid=137&route=product/product&path=37&product_id=271 
  From Australia: Looks like the blurb above without the scrolling.

Both only say it's good for reducing contact resistance

73

Roger (K8RI)


>
> Dave
> _______________________________________________
> Amps mailing list
> Amps at contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>