[Amps] RF in the Audio
Tom Thompson
tlthompson at qwest.net
Sat Sep 24 22:13:29 PDT 2011
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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