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Re: Magnifier system


Nice experiment.  Could the other harmonics be
created from the detuning from shorting out the
isotropic capacity to ground?
Barry

 ----------
|From: "tesla-at-poodle.pupman-dot-com"-at-PMDF-at-PAXMB1
|To: Benson Barry; "Tesla-list-subscribers-at-poodle.pupman-dot-com"-at-PMDF-at-PAXMB1
|Subject: Re: Magnifier system
|Date: Thursday, November 21, 1996 3:00PM
|
|<<File Attachment: 00000000.TXT>>
|> Subject: Re: Magnifier system
|
|From gowin-at-epic-1.nwscc.sea06.navy.milThu Nov 21 09:48:26 1996
|Date: Thu, 21 Nov 1996 09:55:15 -0500
|From: Dan Gowin <gowin-at-epic-1.nwscc.sea06.navy.mil>
|To: tesla-at-pupman-dot-com
|Subject: Re: Magnifier system
|
|Tesla List wrote:
|
|Malcolm,
|
|>
|> >From MALCOLM-at-directorate.wnp.ac.nzWed Nov 20 22:13:44 1996
|> Date: Thu, 21 Nov 1996 08:23:48 +1200
|> From: Malcolm Watts <MALCOLM-at-directorate.wnp.ac.nz>
|> To: tesla-at-pupman-dot-com
|> Subject: Re: Magnifier system
|>
|> Hi Dan,
|>           In reply....
|>
|> >     First, whenever I'm determining the resonate frequency of a 
secondary
|I
|> > personally use
|> > the grid dip method. Attach an "O" scope and RF frequency generator to
|> > the base with dischard
|> > terminal attached (serial). Simply raise the frequency until the coil
|> > starts to draw max current.
|>
|> Different method from mine but just as good. Might not be the best way
|> of measuring unloaded Q though.
|
|Your probably right.
|
|>
|> >     Second, I'll use the same setup to tune my primary to the secondary 
by
|> > using a parrell
|> > setup and <SHORTING> my spark. Then keeping my RF generator at the
|> > resonate frequency, I'll adjust
|> > my primary tap until my primary draws minimal current. There by, both
|> > circuits are in tune.
|>
|> I wonder about that. The resonator should be heavily absorbing when
|> correctly tuned to the primary shouldn't it? I prefer to tune the
|> primary to the secondary with no secondary present to get scope tune.
|> Or is that what you're doing (measuring parallel resonance)?
|
|Yes, Its parallel resonance.
|
|>
|> > And now the fly lands in the ointment!
|> >
|> > In the obove paragraph I stated that the spark gap was shorted,
|> > there by I was able to obtain an LC oscillator with a frequency that
|> > will cause my secondary to resonate. But in operation, the circuit
|> > used is a Spark Inductor Capacitor variety. Spark gap circuits,
|> > also known as dampened wave oscillators, output multple RF
|> > frequencies while in operation. From this understanding come some
|> > questions that need to be asked.
|> >
|> > a) How much wave dampening do these secondary frequency impose on the
|> > secondary, as its being excited
|> >    by the primary?
|>
|> Virtually none, because the secondary being highly selective forces
|> unwanted frequencies to remain in the tank and the energy in them
|> ends up contributing to the fundamental.
|>
|> > b) Would simply dividing the secondary into two parts reduce the above
|> > effects?
|> >
|> >     The base being few but large AWG(9) turns for capturing as much
|> > magenetic energy as possible and reducing the out of phase effects of
|> > the primary. Top comprising many turns of small AWG(30)
|> > wire, to take advantage of the voltage rise due to inductance. And of
|> > course the split secondary's
|> > top part would have to be seperated by a distance that reduces the
|> > primary circuits influence. Therefore,
|> > the magnifier could be an attempt to minimize the amount of cross noise
|> > in a tuned resonate circuit.
|>
|> To me the thing about transformer coupling to the base of the
|> resonator should eliminate the frequency split one normally gets with
|> DTC (over)coupling (I will be checking this soon). I think other
|> spurious resonances generated by the primary decrement alone are (a)
|> pretty insignificant in amplitude compared with the fundamental, and
|> (b) are effectively squished by the selectivity of the
|> secondary/tertiary.
|>
|> Malcolm
|
|I agree with (a) that they secondary frequency's are insignificant in
|amplitude when compared with the fundamental but I'm not so sure about
|(b). The past few weeks I've been conducting some experiments, capturing
|wave forms on my dual trace "o" scope.
|
|    My setup. First, I placed a vertical grounded rod 2 1/2 feet from
|the toriod of my coil. At 2 1/2 feet this is a consistant strike point.
|
|Note: My system uses 6 6' steel copper jacketed ground rods placed out
|      in my rain water saturated yard.
|
|    Second, I attached a 1 megaohm resister to the vertical ground. with
|two 40KV "O" probes attached to the scope. And one attached to the 1 meg
|resister and the other attached to my primary circuit respectively.
|    Last, I attached the trigger connector to the 1 meg resister using
|a resister network. And a 35mm camera attachment was placed on my old
|"o"
|scope, with a 35mm camera and autowinder. (I should receive the pictures
|back
|next week.)
|
|    The idea simply being when the Tesla coil discharges and strikes
|the ground rod it will trigger the scope and I'll get a real time image
|of what is going on. And yes, it does work. According to my eye there
|are
|some parasitic frequency's that are transfered. And some of the
|harmonics
|seam to be 180 out of phase. Understand the amplitude of these are very
|low. But one would have to wonder how much quantum efficiency was robbed
|by these little parasites?
|
|Note: I'm running my "o" scope on a APC 600 UPS that I disconnected from
|      the 120 AC circuitry in my house. There should be no parasites
|from
|      that source.
|
|(Sorry Chip for rattling on.)
|
|Another note: Should receive my coil pictures friday night. And will
|              post those next week.
|
|Tesla coiler at large.
|D. Gowin
|