>Contact resistance, increased by any corrosion or contamination, increases
the resistance of braided cable.
I believe it's impedance that is increased.
73, Keith NM5G
-----Original Message-----
From: towertalk-bounces@contesting.com
[mailto:towertalk-bounces@contesting.com] On Behalf Of Red
Sent: Thursday, July 27, 2006 10:12 AM
To: Beat Meier; TowerTalk
Subject: Re: [TowerTalk]Cadwelding = "alominotérmica"
Stranded wire or cable is acceptable. Braided cable is not acceptable.
As skin effect forces current to concentrate in the outside layer of wire
and as the strands in braided cable change position from interior to
exterior, the current must pass from strand to strand. Contact resistance,
increased by any corrosion or contamination, increases the resistance of
braided cable.
73 de WOØW
Beat Meier wrote:
>Hello
>
>Is cadwelding is the same as "alominotérmica" (term in spanish)?
>I.e. Copper oxide + aluminio powder
>3CuO + 2Al = 3Cu + Al2O3 + heat
>
>And what about connecting ground roads togehter.
>Someone told me I should not use strand copper but the only thing I can
>get is 35mm^2 (AWG2) with 7 strands or 50mm^2(AWG0) with 19 strands.
>Is it true that this will oxide rapidly and loss the low resistance?
>The book I have now says you must use at least 35mm^2 to connect the roads.
>
>Thanks
>
>Beat
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