I think that he was referring to the end result of the total circuit. It may
have capacitive and inductive components in it but the capacitive ones will
exhibit a negative reactance and the inductive a positive reactance.
The resulting impedance will be either resistive, if resonant, or it will be
resistive with a capacitive reactance or resistive with an inductive
reactance. It can not have inductive and capacitive reactance together in
the end result.
73
Gary K4FMX
> -----Original Message-----
> From: towertalk-bounces@contesting.com [mailto:towertalk-
> bounces@contesting.com] On Behalf Of Al Williams
> Sent: Sunday, August 09, 2009 5:01 PM
> To: towertalk@contesting.com
> Subject: [TowerTalk] two benefits of postings on Re: Resonance is over
> rated
>
> One benefit of so many postings on this subject is that raises concepts or
> different ways
> of analying the "problem".
>
> A second benefit is that some postings causes us (me) to review my
> understanding of things that I learned long ago--in this case over 50
> years!
>
> The following posting states something that is not only incorrect but the
> truth is exactly the opposite. Actually it was probably mistated. For
> those
> less trained, here is the correction:
>
> 1. All circuits have both a capacitive and an inductive reactance at the
> same time. All circuits will have some lead length
> which will result in an inductance, no matter how short the lead. The
> inductive reactance xl will be 2piFL accordingly.
> Similarly all circuits will have some spacing between components or leads
> resulting in capacitance. The capacitive
> reactance will be 1/2piFL. These two reactances can be mathematically
> combined serially or parallel. I forget if it was
> Norton, Thevinin, etc. who established the series and parallel formulas.
> There will also be a resistance which must also be included
> (or ignored). The resultant equation is (r1+xl)(r2+xc)/r 1+ xl + r2 + xc)
> for a parallel combination.
>
> 2. The units for the resultant equation is called impedance-- not
> reactance?
>
> 3. A minor mistatement probably?
>
> ----- Original Message -----
> From: "W3YY" <w3yy@cox.net>
> To: <towertalk@contesting.com>
> Sent: Friday, August 07, 2009 7:44 PM
> Subject: Re: [TowerTalk] Resonance is over rated
>
>
> >
> > Something either has capacitive or inductive reactance, both not both at
> > the
> > same time.
>
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