Re: How to tune? (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

---------- Forwarded message ----------
Date: Mon, 2 Jul 2007 11:24:25 -0500
From: resonance <resonance@xxxxxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: How to tune? (fwd)




How about FREE!

Befriend a local tech school electronics instructor or go to the research 
lab at a local university.  You could haul your coil in and they will help 
you tune it --- usually without charge because it would cost them more money 
to have the secretaries do all the paperwork than it would cost them to have 
a tech work with you for 1/2 hr.   Any good electronics person can do a 
basic tune in 20 minutes or less.

Be sure to stick a wire off your toroid the approx length you expect your 
spark to be.  This will allow more exact tuning as the spark usually runs an 
additional capacitance load of 1 pF / 1 ft of spark length.

Resonance Research Corp.
www.resonanceresearch.com


----- Original Message ----- 
From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Sunday, July 01, 2007 6:25 PM
Subject: Re: How to tune? (fwd)


>
> ---------- Forwarded message ----------
> Date: Sun, 1 Jul 2007 14:06:35 -0500
> From: Drake Schutt <drake89@xxxxxxxxx>
> To: Tesla list <tesla@xxxxxxxxxx>
> Subject: Re: How to tune? (fwd)
>
> Thanks a lot guys!  That's the site I was looking for and I also got some
> other good advice from Bart and Dr. R.  Although- I don't really think I 
> can
> afford a signal generator or O-scope at the moment.
>
> Thanks again
> drake
>
> On 7/1/07, Tesla list <tesla@xxxxxxxxxx> wrote:
>>
>>
>> ---------- Forwarded message ----------
>> Date: Sat, 30 Jun 2007 23:19:48 -0700
>> From: Barton B. Anderson <bartb@xxxxxxxxxxxxxxxx>
>> To: Tesla list <tesla@xxxxxxxxxx>
>> Subject: Re: How to tune? (fwd)
>>
>> Well, silly me! Your right. I remembered the photo, but for some reason
>> associated Terry. Sorry Gary and Terry (if he's still listening). Ok,
>> how can I talk my way out of the this one, um, both names have two
>> syllables?
>>
>> Bart
>>
>>
>> Tesla list wrote:
>>
>> >---------- Forwarded message ----------
>> >Date: Sun, 1 Jul 2007 07:26:06 -0600 (MDT)
>> >From: Chip Atkinson <chip@xxxxxxxxxx>
>> >To: Tesla list <tesla@xxxxxxxxxx>
>> >Subject: Re: How to tune? (fwd)
>> >
>> >I think that's Gary Lau.  It's his web site and says "yours truly". 
>> >That
>> >and it doesn't look like Terry either. :-)
>> >
>> >This is the website I'm talking about:
>> >
>> >http://users.rcn.com/laushaus/tesla/index.htm
>> >
>> >Chip
>> >
>> >On Sun, 1 Jul 2007, Tesla list wrote:
>> >
>> >
>> >
>> >>---------- Forwarded message ----------
>> >>Date: Sat, 30 Jun 2007 22:47:26 -0700
>> >>From: Barton B. Anderson <bartb@xxxxxxxxxxxxxxxx>
>> >>To: Tesla list <tesla@xxxxxxxxxx>
>> >>Subject: Re: How to tune? (fwd)
>> >>
>> >>Hello Drake,
>> >>
>> >>The guy sitting in the statue of Tesla at Niagara Falls is our
>> >>illustrious ex-moderator, the famous Terry Fritz! You also gave a
>> >>half-name (Gary Lashus?), I can only imagine is intended to read Gary
>> >>Lau. It's very possible Gary or Terry had a document with a step by 
>> >>step
>> >>tuning procedure, but I can't seem to find it.
>> >>
>> >>With that said, there are various methods. There is of program
>> >>prediction where you insert your coil dimensions and out pops the
>> >>primary tune tap position for your coil.
>> >>http://www.classictesla.com/java/javatc.html
>> >>
>> >>There are also tuning via measurement of signals and trial and error
>> >>(which is actually quite good).
>> >>
>> >>Here is a method noted by Antonio Carlos M. de Queiroz:
>>
>> >>-------------------------------------------------------------------------------
>> >>The method that I use is:
>> >>Connect a 1 Ohm resistor across the output of the signal generator, to
>> >>have a low-impedance signal.
>> >>Connect the signal generator where the spark gap would be, with a
>> >>low-frequency (1-10 kHz) square wave of maximum amplitude.
>> >>The secondary coil and top load shall be in place. Ground can be at the
>> >>oscilloscope ground.
>> >>Look at the voltage over the primary capacitor, or over the primary
>> >>inductor, at the transitions of the square wave.
>> >>Tune the system until you see full notches, like in this photo:
>> >>http://www.coe.ufrj.br/~acmq/tesla/tefpreg1.jpg
>> >>
>> >>This is the ideal tuning without breakout. To account for streamer 
>> >>load,
>> >>connect a wire to the top load with the length of a reasonable streamer
>> >>and tune
>> >>in the same way. Mark the two positions found. The best point will be
>> >>somewhere between these.
>> >>Note that the waveform shows also the resonance frequency of the two
>> >>tanks, and allows the measurement of the coupling coefficient.
>>
>> >>-------------------------------------------------------------------------------
>> >>
>> >>You can also tune by trial and error. This typically indicates that you
>> >>tap a bare wire primary at various positions along the winding of the
>> >>primary which changes it's inductance and thus, the fundamental
>> >>frequency of the primary coil to math the fundamental frequency of the
>> >>secondary resonator. When this procedure is used (the trial and error
>> >>procedure), the cap is usually a fixed value and only the primary is
>> >>varied (because it is mechanically the easiest variable).
>> >>
>> >>There are a couple setup procedures which help this process. First,
>> >>place a breakout point on your topload so that you can identify leader
>> >>length visually (your tuning for the longest leader). You also should
>> >>run the coil at about half power. There are two easy ways to do this:
>> >>1) Using a variac, adjust the variac to 1/2 power.
>> >>2) Use 1/2 the number of gaps in the static gap setup to lower the
>> >>voltage to about 1/2.
>> >>
>> >>As you tap the primary winding (if your other parameters are now way 
>> >>off
>> >>base), you'll find the longest spark lengths near the optimal tap
>> >>position. Some coils (small L primarys) are more finicky than others
>> >>(large L primarys). You'll find out how finicky your coil is by tuning
>> it.
>> >>
>> >>So, lets say you've tuned to the long spark length. Now you need to
>> >>observe the coil running. If your getting any arcs along the secondary
>> >>or from primary to secondary, there are problems. If primary to
>> >>secondary, you'll need to increase the proximity between coils. If
>> >>racing arcs, you'll need to raise the secondary (or lower the primary)
>> >>to again increase the proximity in that particular direction of the two
>> >>coils.
>> >>
>> >>If it's running fine without those pesky problems, you may want to 
>> >>lower
>> >>the secondary down into the primary until you "see" those problems
>> >>occur, and then raise the secondary to just get outside the racing
>> >>sparks. Once you've done that, your tuned for low power.
>> >>
>> >>Yes, I said "low" power. Now you'll need give the coil all it's got
>> >>without limiting the power. You may find that the coil is having racing
>> >>arcs at high power. So, definitely go through the tuning process one
>> >>more time regardless. The low power tuning helps us in the long run. If
>> >>something is connected wrong, or whatever, it may prevent the coil from
>> >>serious damage.
>> >>
>> >>Longer sparks often load the coil causing a frequency shift during
>> >>normal running and likely the primary will require a little added
>> >>inductance to offset the frequency shift. This can be often times 
>> >>termed
>> >>as running "high on inductance" a few percent (maybe 5% to 8%, 
>> >>sometimes
>> >>more if the primary coil is several turns). What this means is that 
>> >>from
>> >>a "calculated" standpoint without spark loading, the coil runs better
>> >>when it is detuned high on inductance to offset streamer loading. You
>> >>might be surprised at the number of coilers that actually run high on 
>> >>Lp
>> >>(and some without realizing it). But, many do realize this. I was very
>> >>surprised to find out during some TSSP testing that everyone else
>> >>testing was also tuning the coil high on inductance for "best coil
>> >>output" and "a nice running coil". I'm not even sure if they all
>> >>realized it. It was eye opening to me. Following this realization, I
>> >>threw into Javatc a detuned output in the primary table to identify if
>> >>the coil is high or low on inductance and how much via a percentage.
>> >>
>> >>Not sure if any of this will help. Hopefully someone will post the page
>> >>you lost.
>> >>
>> >>Take care,
>> >>Bart
>> >>
>> >>
>> >>
>> >>Tesla list wrote:
>> >>
>> >>
>> >>
>> >>>---------- Forwarded message ----------
>> >>>Date: Fri, 29 Jun 2007 22:03:22 -0500
>> >>>From: Drake Schutt <drake89@xxxxxxxxx>
>> >>>To: Tesla list <tesla@xxxxxxxxxx>
>> >>>Subject: How to tune?
>> >>>
>> >>>Hey everyone- I'm getting to the point where my coil is almost done 
>> >>>and
>> >>>realized that I lost a very important webpage link.  It was a tutorial
>> on
>> >>>how to set up and properly tune your coil and it was great!  now it's
>> lost
>> >>>:(   If anyone knows where I can find this or a similar step by step
>> guide
>> >>>to setting up my coil I would be obliged.  I think it might have been
>> on
>> >>>gary lashus' (can't really remember his name) page but I really can't
>> find
>> >>>it.  All I remember is the first page on his site was him sitting on
>> some
>> >>>huge statue.
>> >>>
>> >>>thanks a million
>> >>>drake
>> >>>
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