[TenTec] [SMC] OT: Half inch Andrews Heliax LDF4-50A vs LMR-400

[Jim Brown]

On 4/26/2013 12:25 PM, Carl Moreschi wrote:
> So you are saying the effective resistance at 28 mhz is higher than at 
> 14 mhz because there is more skin effect and therefore less copper is 
> actually being used for conductance.

Yes. That's how skin effect works -- the magnetic field created by 
current pushes that current to the outer skin of any conductor. Remember 
also that with coax, also due to skin effect, differential current that 
is equal and opposite in polarity to the current on the center conductor 
(the signal) is forced to the inside of the coax shield, and common mode 
current (the shield acting as an antenna) is forced to the outside of 
the shield.

There's quite a lot of discussion of these concepts in the literature.

73, Jim K9YC