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>From: "Jim Osburn, WD9EYB" <[log in to unmask]>
>To: <[log in to unmask]>
>Subject: Re: [WVARA] capacitance question
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>Date: Sun, 16 Feb 2003 10:27:01 -0500
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>The ARRL Handbook for Radio Amateurs answers your questions.
>The license manuals focus on the stuff you need to pass the
>test and fall short of giving complete explanations.  Next time your
>at a hamfest you need to buy a copy of the handbook.  It doesn't
>have to be a new one, you can find old ones at reasonable prices.
>
>My 2001 handbook has a drawing of a multiple-plate capacitor on
>page 6.9 in figure 6-17.  The figure shows that alternating plates are
>connected together, so the capacitances add in parallel, not series.
>The tuning capacitors in old radio tuners (and new antenna tuners too)
>have the plates that move all connected to each other, and the plates
>the stay put all connected to each other.  So all the capacitances add
>in parallel and you can have a variable capacitor that fits inside the
>box instead of taking up a lot of space.
>
>The amount of overlap determines the amount of capacitance.  The
>more overlap there is, the more capacitance.  The less overlap there
>is, the less capacitance.  So when the plates on a variable capacitor
>are fully meshed, you have the maximum capacitance.  When the
>plates on a variable capacitor a completely unmeshed, you have
>minimum capacitance.
>
>Hope this helps.
>
>Jim, WD9EYB
>
>----- Original Message -----
>From: Keith Reedy <[log in to unmask]>
>To: <[log in to unmask]>
>Sent: Saturday, February 15, 2003 5:00 PM
>Subject: [WVARA] capacitance question
>
>
> > >I'm studying for my test this week and have what appears to me to be a
>pretty
> > >basic question but cannot find the answer to it.  One of the things said
>to
> > >determine capacitance is one side of one of the plates.  Do I assume that
> > >if we
> > >have something like a tuning cap with multiple plates such as in old
>radio
> > >tuners that this is treated as a series?  Second, when they say one side
> > >of one
> > >of the plates I'm assuming that means the side toward another plate.  My
> > >question is does that mean the smaller plate (if that apples) or does it
>mean
> > >the plate with the smallest area overlapping the other plate?
> > >
> > >Sorry if I'm being a little slow with this but I just don't seem to be
>able to
> > >find that particular question answered.  Even the ARRL book I've got just
> > >quotes
> > >from the question in the pool as an explanation.
> > >
> > >Tom
>
>
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Keith-WA9DRO
God gives His best to those who leave the choice with Him.
Hudson Taylor