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
_______________________________________________
TenTec mailing list
TenTec@contesting.com
http://lists.contesting.com/mailman/listinfo/tentec
|