Re: NEC-LIST: Copper oxide.

I'm not a chemist, but know that various copper salts form in different
environments. I don't know for sure, but think you could find copper
oxide, chloride, or sulfide -- or combinations thereof -- depending on
what the wire has been exposed to. I'd expect, for example, to find
copper chloride near the ocean and copper sulfide near a refinery or
perhaps just in an urban environment.

Some time ago I wrote down the following list, but don't recall for sure
whether it came from Reference Data for Radio Engineers or the CRC
Handbook of Chemistry and Physics. Neither of my older copies of those
books contain them -- I got them from a more recent version at a library.

Cu2O 10-50
CuO 6000
CuS 0.3 to 83 X 10^-6
Cu2S 80 to 100 X 10^-6

So, not only do you need to guess the thickness, but you'll also need to
guess at what salt(s) have formed.

About aluminum -- aluminum oxide (alumina) is a very good dielectric,
used for such things as hybrid circuit substrates at frequencies well
into the microwave region. While it's got a relatively high dielectric
constant (about 10), the coating on a piece of aluminum is extremely
thin. It shouldn't be expected to have any noticeable effect on an antenna.

Roy Lewallen

D. B. Miron wrote:

> Hi Bob,
>
> Using NEC4 would mean I'd have to know the properties of
> the oxide and guess at the thckness. I suppose I could try
> it for interest. Is "Communication Quarterly" the same as
> QEX magazine? Can you give me a more specific reference?
>
> Thanks,
> Doug Miron KC 0 NKY
>

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