Can anyone tell me the resistance values of different metal tubing? Like emt compared to copper,stainless,and aluminum? (This is for antenna building).
Resistance of different metals
Jan 10, 2005
12 Replies
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-- very nice.
Where would emt fall on that list?
emt?
EMT condiut. WOuld it be the same as regular steel?
Accordint to that list copper is the most conductive. DOes that mean it is the best to make an antenna out of? DOesnt copper "tarnish" or rust out in the environment?
Tarnish, yes. Rust out -- not unless you're by the sea shore. But that's why you're asking about paint.
I _think_, but don't know, that the copper oxide isn't terribly conductive and so doesn't mess up the antenna characteristics. Aluminum is quite good -- it's very conductive, aluminum oxide is very non-reactive and is a perfect insulator, so there's no dissipative layer.
You tell me -- is it galvanized? What of the skin effect?
Design a Wheatstone bridge and measure them. It depends on so many many items - alloy , and dimensions ....... attachment...
Martin
Between zinc and iron, depending on skin depth. You indicate elsewhere you might be in the +100MHz range, so probably zinc. Which isn't too bad.
Better than stainless.
Tim
-- "I've got more trophies than Wayne Gretsky and the Pope combined!" - Homer Simpson Website @
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Ive got a 375' plus spool and at least a hundred feet more of .020 x .125 MWS-294 resistance ribbon, if anyone needs some
Google is your friend for the data.
Gunner
"At the core of liberalism is the spoiled child - miserable, as all spoiled children are, unsatisfied, demanding, ill-disciplined, despotic and useless. Liberalism is a philosphy of sniveling brats." -- P.J. O'Rourke
Yes, it is galvanized.
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