Re: [Amps] RF in the Audio

[Tom Thompson <tlthompson@qwest.net>]

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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