Re: Mains conditioners and power cables

In article <Yu5Qe.972$n4.807@xxxxxxxxxxxxxxxxxxxx>, Arfa Daily
<arfa.daily@xxxxxxxxxxxx> wrote:



> I don't dispute anything you say about reference points, but you must
> understand that the reference point for the interfering signal is
> GROUND. It is a voltage induced in both wires, equally in amplitude and
> phase, as a result of an electric field referenced to GROUND.

Need to take a little care here as there may be some confusions between
currents and potentials, and between potential differences and departures
fro electrostatic neutrality. Alas, electronics courses don't always make
these distinctions clear.

[snip]

> Somebody help me out here ? Am I deluding myself thinking that it's an
> easy concept ?

On the key point I agree with you. This is that the receiver is designs to
detect the *difference* between the currents and/or potentials. This
implies a 'subtraction' which in turn means we have to regard one input as
the '+' one and the other as the '-' one for obtaining A-B as the result.
This is the standard description in my experince.

IIUC the real problem here is that we have to establish an agreed standard
definition and use of terms in order to communicate. The one that has been
established is as you (and others) have explained, and differs from that
used by Rod.

Such agreed usages aren't always ideal. e.g the annoyance that
'conventional current' now is assumed to be in the opposite direction to
the movement of electrons. However the useage and definitions are
established, so the communicate we have to use them unless we want to
always preceed any discussion with a new set of definitions.

In itself, I'd say there is nothing 'wrong' with Rod's view. The snag is
that it isn't the convention. Hence this needs to be remembered if he
wishes to discuss matters involving this with others, or we will all end up
arguing at cross-purposes. (No surprise there! :-) )

Slainte,

Jim

--
Electronics http://www.st-and.ac.uk/~www_pa/Scots_Guide/intro/electron.htm
Audio Misc http://www.st-and.demon.co.uk/AudioMisc/index.html
Armstrong Audio http://www.st-and.demon.co.uk/Audio/armstrong.html
Barbirolli Soc. http://www.st-and.demon.co.uk/JBSoc/JBSoc.html
.

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