Re: [TCML] Q

["Jared Dwarshuis" <jdwarshuis@xxxxxxxxx>]

Hello Bart:


Large top end capacitance represents an extremely favorable impedance. If
you can get the spark length you are after, large top end
capacitance is exactly what you want. Problem is that the voltage drops
considerably when you use a large top end, so sparks wont jump very far.

When building  half wave coils nowadays, we use unbelievably large top end
capacitors, so big in fact,  that the spark just barely initiates. (We know
that the sparks just barely initiate because opening the gap a few more inch
and we get no spark.)

At the edge where we have the lowest voltage potential possible across the
top end capacitor. That is where the power through the system is the
greatest.

Jared Dwarshuis

On Dec 3, 2007 10:16 PM, Barton B. Anderson <bartb@xxxxxxxxxxxxxxxx> wrote:

> Hello Jared,
>
> Jared Dwarshuis wrote:
> > You get higher Q in both the secondary and primary by diminishing
> coupling.
> > When coupling is small there is less frequency splitting and Q rises.
> >
> Yes, but the change in Q is small with large changes in coupling. But,
> you are of course correct in your statement.
> > You can also get higher Q by operating the secondary at its
> characteristic
> > resonant frequency ( the wire length frequency)
> >
> Yes, your will. But why? Answer =  because at resonance, reactance
> cancels (fewer losses).
> > Smaller top end capacitance will also increase the Q of the secondary,
> but
> > unfortunately will give a poor impedance match with less power output.
> I agree. Larger top loads will decrease Q of secondary. Reason is not
> the AC resistance (it gets lower as the frequency lowers), but due to
> the L/C situation.
> > One wants the Q of the entire system to be low. This means that your
> energy
> > is being dissipated as sparks.
> >
> I don't fully agree here (but I understand what you are thinking) and my
> reasoning is partially my experience. Higher Q secondary's have got me
> longer sparks. But even with this, there is a balance of top load
> storage. When it comes down to spark production, Q is not the only
> product to consider. Larger top loads have greater storage capacity, but
> the secondary (stand alone with higher Q) will get the energy to the top
> load faster. If the top load is too small, it can only store so much
> energy. But if it's larger, it can store more energy. Higher Q
> secondary's simply help get the power into the top load with fewer
> losses in the transfer, but at a reduced voltage.
>
> Take care,
> Bart
>
> > Jared Dwarshuis
> > On Dec 2, 2007 8:52 PM, nnanred1@xxxxxxxxxxx <nnanred1@xxxxxxxxxxx>
> wrote:
> >
> >
> >> hi,
> >> yes it does effect the number of cycles.  if ur loseing a lot of energy
> >> each cycle the circuit will quickly wind down.  in the limit the
> circuit is
> >> "dead beat."
> >>  by now,
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