Re: [SI-LIST] : even-odd mode influence

Adrian Shiner (adrian.shiner@virgin.net)
Fri, 16 Jul 1999 22:06:27 +0100

Douglas, we must be around the same wearout phase! The experience comment was food for thought for the younger members of our fascinating profession.
Best wishes
Adrian

Douglas McKean wrote:

> At 08:27 PM 7/15/99 +0100, Adrian Shiner wrote:
> >You are right, but the real world is that you get both in some proportion
> no matter how you think you have designed in one mode. Can't answer on the
> tools.
> >
> >PCB scale, box scale, system scale, the fundamentls remain the same. The
> engineering changes a bit. It strikes me that some younger guys out there
> are relying on their college education & software tools too much. Get
> reading and
> >talking to the guys with grey and thin(ning hair)! Experience counts and
> pride in one's education comes before a fall (to distort a well known
> phrase or saying!).
>
> Can't imagine someone trying to design for only one
> mode. The question pertained to "effect". The other
> effect are differences in impedance between even and
> odd being almost 30%. Something to consider. Well,
> maybe since no one has brought it up.
>
> I didn't hear about even or odd mode impedances until
> 10 years after the university and that was over 15 years
> ago. And I've got more than enough of the grey hair.
>
> But thanks for trying to call me a "younger guy".
>
> Much appreciated!!!
>
> Regards, Doug McKean
>
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