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*To*: tesla-at-pupman-dot-com*Subject*: 180 phased Resonances/the third schematic arc gap*From*: "Tesla list" <tesla-at-pupman-dot-com>*Date*: Sun, 06 May 2001 10:30:44 -0600*Resent-Date*: Sun, 6 May 2001 10:42:07 -0600*Resent-From*: tesla-at-pupman-dot-com*Resent-Message-ID*: <Sevc-B.A.uQ.W7X96-at-poodle>*Resent-Sender*: tesla-request-at-pupman-dot-com

Original poster: "harvey norris by way of Terry Fritz <twftesla-at-uswest-dot-net>" <harvich-at-yahoo-dot-com> --- Tesla list wrote: > Original poster: "Marco Denicolai by way of Terry > Fritz " > > > Hello all. > > While digging for the roots of the air-coupled > resonator theory, I > bumped into the Oberbeck reference > > A. Oberbeck, Wied. Ann. 55, 1895. This document presumably in German contains Tesla's name in the title. It was not an independent developement by Oberbeck. He published a theoretical analysis of Tesla's oscillator in 1895. > > I haven't got the paper, but I know that there the > basic laws for > air-coupled resonators are stated, for the case > where L1*C1=L2*C2. > > Now, if I recall Tesla stayed in Colorado Springs > from May 1899 until > early 1900, and there he developed the 2-coil TC and > the magnifier. > > My questions is, was Tesla aware of Oberbeck's work? Rather the inverse situation I would think. > If he wasn't, how's that possible? > If he was, so what did he actually invent? > Regards Marco Denicolai The first record Of Tesla's high frequency coupled oscillatory circuit with an air cored transformer is to be found in patent 454622 of 23 June 1891 under the title "System of electric lighting". The oscillator converts low frequency currents into "currents of very high frequency and very high potential" which then supplies single terminal lamps. (from Aleksandar Marincic's CSN preface) The arc gap in this schematic is within the tank circuit, something later abandoned as the best method. On July 2,1899 Tesla notes the reasoning for this; In a schematic showing the break within the tank circuit he comments... "the scheme of connections has the disadvantage that the primary discharge current passes through the break hence, the resistance of the latter being large, the oscillations are quickly damped and there is besides a large current through the break which makes good operation of the latter difficult. To prolong oscillation in the primary and increase economy one of the schemes before considered may be resorted to." He then refers to the conventional approach of allowing the break to be shunted across the hv secondary outputs where he comments.. "in this arrangement the currents through the break device are much smaller and the oscillations started by the operation of the break device continue much longer." Tesla makes no comment concerning the idea of placing an inverse tank circuit on the other side of the break in the first example for a center tapped high frequency transformer. In that situation two (180 phased)primaries would recieve their oscillations from a single arc gap. The problem of the arc containing the entirety of the currents is then circumvented by the pathway established along the sides of the newly configured figure 8 LC quantities. So here I am making some conceptual suggestions upon implementing the "third schematic arc gap" apparently neglected by Tesla as a possibility. This is described using dual identical spirals. The usual reply that this is already accomplished by a bipolar tank circuit does not take into account the fact that in the "third" schematic possibility there are two and not one capacities involved. I am still working to try a NST gap like that. Cant take that much longer. I have made some preliminary modeling ideas using the dual spirals available at Radio shack as their flat stranded 50 ft insulated for a mini-tesla coil primary. I'm trying mine in a bipolar application for a mini tesla coil one would suppose that length of the wire is is small in comparison on the smaller mini secondary, thus making the operation at a high frequency. Since the duration of that rf burst is then a very small time period,I am aiming for a very high bps rate which this system should permit. Here are some considerations of difference in tuning with a single arc, oscillating two primaries 180 out of phase as I have described as a Binary Resonant System,(BRS) 1)Because magnetic agreement between the primaries is necessary for the maximum inductance, and the currents on the primaries themselves are 180 out of phase, and the further fact that the spirals themselves are not themselves bifilar with respect to each other: to make the fields in agreement means that opposite outer and inner coil connections to the repective opposite hv terminals is necessary. The inner and outer leads of the dual spirals that remain are in turn connected to capacities which connect in series with the opposite hv potential. This then consists of two oppositely phased series LC quantities in parallel which is the current limiting condition before gap firing. 2) The arc gap is made from the connections at the midpoints of the 180 phased series LC quantities, or the ends of the inner and outer wire spirals that are not connected to the hv secondary. Thus upon arcing the resistance of the primary is on either side of the arc: the arc is not directly shunted to the hv ouput. 3) The capacities on each side are NOT made from the resonant frequency calculated from that sides L quantity, but rather the quantity established by the needed capacity to resonate with both L quantities in mutual inductance where the primaries are in series to determine this new L(total). A C(total) is then matched to this new L figure to resonate, and each side will recieve twice C(total). This is because these capacities will appear in series when the gap fires, thus to arrive at C(total) twice the value must be used in series. 4) Because of the dielectric qualities of the insulation between windings the spiral set also has a internal capacitance, and adding capacitance on each side of the LC quantites may not change the resonant frequency as suspected. Since the set then has a recorded C internal capctance of 220 pf, and a measured .636 mh L quantity correctly wired in series, a natural resonant frequency of 425,000 hz might be suspected. A scope measurement of this frequency seems to indicate 588,000 hz including the 25 pf scope capacitance. 5) It may be possible to simply connect the inner and outer spiral ends together at an arc gap and have the primary resonate at its own natural resonant frequency established by its internal parameters. Of course then one would have no tuning and be limited to placing the correct secondary to resonate in place. HDN ===== Binary Resonant System http://members3.boardhost-dot-com/teslafy/ __________________________________________________ Do You Yahoo!? Yahoo! Auctions - buy the things you want at great prices http://auctions.yahoo-dot-com/

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