[Antennas] RG-178 balun turns count

Fri Jul 2 21:37:30 EDT 2010

Clete,
Possibly this URL will help with your question
*w2du*.com/r2ch21.pdf
73,
Danny, K6MHE
On 07/02/2010 03:28 PM, C.Whitaker wrote:
> de WB2CPN
> It's easy for me to understand Common Mode current as it
> applies to balanced transmission lines. I mean current which
> flows on both wires in phase, but It's not clear how this concept
> is transferred to an unbalanced coaxial cable. Incidentally,
> for high-voltage power lines common mode current is a no-no.
> If there is common mode current flowing in the shield, is there
> also an equal current in the same phase flowing on the center
> wire? If not, why not. If so, then the current on the center wire
> is the sum of the common mode current and the signal current
> which is out of phase with the inside of the shield. Huh?
> Also, if a coaxial cable is wound around a ferite core, and a
> inductance meter is used to measure the inductance of the
> center wire, and then the shield, are the values the same?
> 73 Clete
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