# [AMPS] Re: 6m amp blocking caps

**2
**
2@vc.net

*Thu, 6 Dec 2001 20:31:46 -0800*

>*
*>*It's _NOT_ a parallel resonance in the sense that you have a capacitive
*>*value in parallel with an inductive value.
*>*
*In a 2-component, parallel circuit, the components are in series with
each other and they are in series with the L of the conductors used to
connect them.
>*You have two non-equal lumped values in parallel.
*>*
*I see the two, equal values of C and two equal values of L - in the two
Cu straps.
>*Whip out Thenevin's theorem to solve this one -- in this particular dynamic
*>*example, the two lumped values are not equal. Together, they provide a
*>*lumped value that is equal to neither individual value, and is not
*>*necessarily proportional to one or the other because of the complex
*>*interactions between the two doorknob caps and the components on each end.
*>*
*>*Hell, even a Second Class Boy Scout could figure THAT one out.
*>*
*>*Now -- could you see parasitic effects within an octave of the operating
*>*frequency of the two-doorknob network?
*>*
*The blocking caps' VHF-resonance is in the VHF-resonant anode circuit.
>*Apparently, somebody can in their application.
*>*
*>*Theory is great and models are great, but the rubber meets the road when
*>*you hook these things up. Empirical results need to be given significant
*>*consideration, especially when things start blowing up.
*>*
*>*Jim N6OTQ
*>*
*>*And because of some things that have gone past on my monitor recently AND
*>*in years past, I do have to remind everybody -- the fundamental basis for
*>*this discussion is "when things start blowing up."
*>*
*>*
*>>>*\ This does not appear to be the result when one experimentally
*>>>*parallels two, equal value doorknob caps with straps and checks for
*>>>*resonance with a dipmeter.
*>>>*
*>>*If anyone other than Rich feels that I have not explained clearly enough
*>>*in pervious postings why this is *not* a parallel resonance, I will try
*>>*again.
*>*
*
- R. L. Measures, 805.386.3734,AG6K, www.vcnet.com/measures.
end
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