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John Curl's Blowtorch preamplifier part III
John Curl's Blowtorch preamplifier part III
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Old Today, 12:58 AM   #14191
billshurv is online now billshurv  United Kingdom
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John Curl's Blowtorch preamplifier part III
[QUOTE=simon7000;5708491

There are special coaxial cables where the center conductor is silver plated.

[/QUOTE]


Not very special ones. It's very common. Silver plated copper coated steel core is used in common or garden RG214 to name but one.
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Old Today, 01:03 AM   #14192
scott wurcer is offline scott wurcer  United States
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Quote:
Originally Posted by simon7000 View Post
Scott I realize you ignored the depth of .003" that I mentioned. That is pretty deep.
You said uniform layer of a 1000 times less conductive material how this translates to a roughness in a fully conductive material only you know. Also this is audio not microwaves and you seem to ignore the magnetic properties of the coating which matters to skin depth. There are studies on line of accelerated life tests on power transmission lines with gross corrosion in acid baths.

Silver plating of cavities etc. is well know to increase Q, so we have silver (higher conductivity) with lower loss, bare copper the basic loss, a coating of copper oxide, 1/1000 conductivity, 1.2dB/ft, a coating of Teflon (0 conductivity) puts us where?

If you don't show the formulation you are working from and the assumptions you make there is no point in a discussion. The basic theory here is a bunch of one liners, it's not that hard to present them.
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Old Today, 01:03 AM   #14193
dimitri is offline dimitri  United States
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Quote:
I thought it was common knowledge that surface roughness causes increasing loss with increasing frequency.
Your copper oxide behaves in the same way
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