Re: Extra coil

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "rheidlebaugh by way of Terry Fritz <twftesla-at-qwest-dot-net>" <rheidlebaugh-at-zialink-dot-com>

Just a thought as you 2 are discussing the extra coil. Before we had a tube
radio we had crystal sets that, at best, tuned 2 stations at once with low
volume. When we added an extra coil (3 coil system) the volume went up and
we tuned only one station at a time. The extra coil increased the total Q
and made the tuning narrow. Is it not likely that a similar effect is seen
in the TC with the extra coil?  More power going into one frequency band and
less power into the unwanted harmonic losses.
   Robert  H 

> From: "Tesla list" <tesla-at-pupman-dot-com>
> Date: Wed, 06 Feb 2002 18:59:12 -0700
> To: tesla-at-pupman-dot-com
> Subject: Re: Extra coil
> Resent-From: tesla-at-pupman-dot-com
> Resent-Date: Wed, 6 Feb 2002 19:14:32 -0700
> 
> Original poster: "Malcolm Watts by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> <m.j.watts-at-massey.ac.nz>
> 
> Hi Nele,
> I must confess that I share John Feau's view of magnifier
> operation. In fact, one of my first measurements on one confirmed
> what he said and was previously postulated by Dr de Queiroz, notably
> the value of Ksys. I too have read Tesla's notes on this but think
> that what he thought and what actually happens are two different
> things with respect to this particular form of TC. It is a nice idea
> to think that the primary/secondary act like an oscillating voltage
> source but in a disruptively-driven system they cannot for two
> reasons: K for the pri-sec system is less than 1 and secondly, it is
> driven from a charged capacitor (which runs down to empty), not a
> voltage source (zero internal impedance generator).
> 
> Once the gap has gone out in a 2-coil system, there is
> fundamentally no difference in the way that resonator behaves to the
> extra coil/secondary system in the 3-coil machine, save that under
> certain conditions of relative inductances and coupling between the
> two as outlined in paper on Dr de Queiroz's website, the two might
> have energy transferring between them and ending up in one or the
> other in its entirety. In other words, a coupled double-tuned circuit
> is still present in the 3-coil machine, even after the gap has
> extinguished. Clear as mud I'm sure :)
> 
> I would also like to add that I built a scaled miniature of the
> CS machine a couple of years ago and found that there is significant
> coupling between the extra coil and secondary, not entirely
> unexpected I have to say given the arrangement of the coils. The
> value I measured was confirmed by Dr Rzsesotarski's excellent MandK
> program (it was about 0.06 if I remember rightly). The physical
> arrangement developed by Robert Golka (the extra coil was no longer
> co-axially mounted) to the pri-sec system came closest to the nirvana
> Tesla was after but the coils were still coupled by virtue of a
> physical connection.
> 
> Regards,
> Malcolm
> 
> On 6 Feb 2002, at 7:47, Tesla list wrote:
> 
>> Original poster: "Nebojsa Kovacevic by way of Terry Fritz
> <twftesla-at-qwest-dot-net>" <morfeus-at-EUnet.yu>
>> 
>> 73
>> Hello All!
>> 
>> Most of the people are confused with the part of the Tesla coil which he
>> named "extra coil". In his lab we can clearly notice three separated
>> parts: primary circuit, secondary circuit and the thing that Tesla calls
>> "extra coil". Primary coil transforms the AC currents of 140Hz from the
>> primary transformer into the high frequency currents (radio frequency).
>> The purpose of the secondary coil is to on a specific frequency produce
>> energy for the helicoidal resonator. Complexe construction of the extra
>> coil makes the perfect conditions for using the possibilities of the
>> helicoidal windings as a slow wave resonator. This type of coil is now
>> days known as opened helicoidal resonator.
>> The configuration we are comonly using today is producing high voltage
>> only (high energy). But if we want to get high voltage and high
>> amperage, we should construct the system with tertiary coil.
>> Let`s take a look at the Tesla`s apparatus as a perfect example. He used
>> adjusted main oscillator for transform low frequency to radio frequency
>> currents. Primary coil has very high inductive relation with the
>> secondary, which has the serial resonance of the same frequency as
>> adjusted helicoidal resonator from which Tesla emitts his streamers.
>> Many people are surprised that the secondary coil is adjusted on the
>> exact frequency as the primary coil. The real attention should be paid
>> on the extra coil which spectaculary dominating on the central part of
>> his lab.
>> Rotary break is the most important part in the constuctions with extra
>> coil. Before all, for a high power you need as many breaks as you can
>> acchieve per second. Everyone has to have in mind that high amperage in
>> the coil doesn`t mean very high voltage. The power which is transmitted
>> to the secondary coil is proportional to the number of the breaks in
>> second. Other usefull aspect of the break is the break duration which is
>> the key for a proper functioning of the primary and secondary coil. The
>> time duration of the spark in the break is the time in which the spark
>> really exists in the gap before it shuts down.
>> While the spark is in the gap, the system will oscillate on the two
>> frequencies (two line system so to call it). Spectral diference, or the
>> frequency diference is proportional to the magnetic relation between the
>> primary and the secondary circuits. To get the max. results, these two
>> frequencies should have the frequency diference DF.
>> All this means that with incresing the inductive relation between the
>> primary and the secondary, the time of the spark in the gap should be as
>> shorter as possible. But, in the case of critical relation between the
>> coils, DF is falling to zero, so the duration of the spark isn`t a
>> controll parameter any more.
>> 
>> The readers familiar with the problem must ask them selfs, why to build
>> an extra coil? Isn`t the finall goal we are all trying to acchieve,
>> generating a high potencial (energy)? This is true if we want to get
>> only high potencial. Hmm....our friend Tesla must have wanted more. In
>> Colorado, he wanted to get  high potencial and very high power.
>> We are all aware of the two frequencies that builds in the system with
>> very high inductive related coils(primary and secondary). The phenomenon
>> of two frequencies. This can be seen as a two frequency spectre on the
>> o-scopes with primary and secondary coils with concentrated parameters.
>> Extra coil should be noted as a diferent part of the system, comparing
>> to the one we have in the primary-secondary system. (When it is compared
>> with the secondary coil, it`smagnetic relation to the primary coil is
>> minor). Extra coil is infact 1/4 wave lenght helicoidal resonator.
>> Analise of the tertiary coil as a concentrated parameter circuitry is
>> absolutly unsuccessful.
>> In every way, the looses should be cut down in the tertiary coil.
>> Helicoidal resonator on lower frequencies is only a coil of the small
>> diameter with high number of turns of wire, placed above the ground.
>> Coil, with capacitor on the top acts as a 1/4 wave lenght "antenna"
>> which doesn`t emitts. Instead of the vertical tower a few thousands of
>> feets high - real aerial, Tesla had the resonating coil which doesn`t
>> emitts, and it`s hight was only a part of that hipotetic tower. The
>> nature of the slow waves in the coil is what makes all this possible. It
>> should be paid attention on a few things about the helicoidal
>> resonators:
>> The base or entry will have the characteristical low impendance, and on
>> the top (or the high frequency exit), will have high impendance. This
>> means that in the purpose of the activating the coil Tesla had to
>> connect a very high currents to the base of the extra coil. That way, as
>> much electricity you put in the base of the extra coil, with  properly
>> adjusted frequency, the more electricity you will get on the top of the
>> coil(terminal). The currents on the top depends on the high frequency
>> currents in the base of the extra coil, short wave voltage ratio, and
>> the characteristical impendance of the resonator. All these claims can
>> be measured and calculated very easily. Besides, as tertiary coil can be
>> used any 1/4 wave lenght resonator which doesn`t emitts - helicoidal
>> resonator, coaxial resonator, even microwave owen!
>> I am hoping that in this point, every reader is abble to see that the
>> combination of the primary and the secondary coils is, efectivly, only
>> one powerful oscillator of the high energy, which brings the currents of
>> the low voltage and high amperage in the base of the extra coil, in
>> order to build a high potencial high energy currents.
>> 
>> I think that we should add this coil in our constuctions finally......
>> 
>> Regards,
>> Nele
>> 
>> 
>> 
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