On second thought, if all the impedances are equal, the currents are
equal but I doubt that can really occur in the real world.
Tom W0IVJ
On 9/24/2011 11:13 PM, Tom Thompson wrote:
>
> On 9/24/2011 10:07 PM, Jim Brown wrote:
>> On 9/24/2011 5:20 PM, Peter Voelpel wrote:
>>> But the question concerned that perfectly! balanced open feeder which
>>> certainly carries no common mode current.
> From Wikipedia: In telecommunications
> <http://en.wikipedia.org/wiki/Telecommunication> and professional audio
> <http://en.wikipedia.org/wiki/Professional_audio>, a *balanced line* or
> *balanced signal pair* is a transmission line
> <http://en.wikipedia.org/wiki/Transmission_line> consisting of two
> conductors of the same type, each of which have equal impedances
> <http://en.wikipedia.org/wiki/Electrical_impedance> along their lengths
> and equal impedances to ground
> <http://en.wikipedia.org/wiki/Ground_%28electricity%29> and to other
> circuits.
>
> This does not imply that the currents in the wires are equal and
> opposite and if they are not, then a common mode current is present.
>
> Tom W0IVJ
>
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