[Elecraft] Off Topic RG-174

[David Woolley (E.L)]

Jim Wiley wrote:
> 
> Well, according to the wire tables, the 26 gauge center conductor can 

Where do you find wire tables for 50MHz?  The ones I've seen are for 50 
or 60Hz.

> safely handle about 350 to 400  milliamperes, depending on how you 

If you are using 60Hz wire tables, you will need to derate the current 
handling by maybe a couple of orders of magnitude!  I'd suggest finding 
out the mains frequency resistance, then calculating the power 
dissipation per unit length.  Next take the 50MHz attenuation and 
convert that to a power dissipation, and match the two.  This is not 
perfect, because the attenuation will include dissipation in the 
dielectric and the shield, which might be closer to the surface and 
therefore dissipate more easily.


-- 
David Woolley
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