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RE: [TCML] Tuning a coil PLEASE HELP
Hi Andrew.
When you "sweep" the frequencies be certain you land on the true resonate
frequency. The 1st 3rd and fifth, I believe, can trick you. Clearly the
fundamental is the first rise in "amplitude".
Please don't make this overly complicated as it is a straight forward
procedure. This is a great opportunity to get more acquainted with your
O-scope.
If you are new to this, in my experience, the primary is much more obvious
(Q factor). Once you see the obvious peak, return to the secondary and look
carefully for the fist peak in amplitude and set your primary to that
frequency. Viola'
Cake walk! I like the notion of using a wire as a streamer imitator for
expected loading. I tend to use brute force rather than fine tuning.
Best Sparks!
Jim Mora
-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
Of BunnyKiller
Sent: Wednesday, May 06, 2009 6:54 AM
To: Tesla Coil Mailing List
Subject: Re: [TCML] Tuning a coil PLEASE HELP
Hey Andrew,
Instead of trying to use a setup that is that "precise" try using JavaTC
and get the info to get a very good ballpark number of your system
first. From there you can make the system better "tuned" instead of
trying to match "numbers" that change once the system is turned on and
running.
Its kind of like trying to tweak a carburator on a car with the engine
not running.....
Once you put power to the coil, You will still need to move the primary
tap around untill you find the best spot...
And if you havent run your coil yet, dont expect it to work the first
time... Mr. Murphy loves coils!!
but to help you understand what you are looking for with the generator
and meter/scope,
the secondary has its own specific frequency, and if you put a signal
into that coil, it will try to resonate with that signal in some of the
"phases" ( harmonics).
As the input signal becomes matched to the natural frequency of the
coil, the "energy" is reflected back down the coil thus producing an
increase in the power ( amplitude/height) of the sinewave. An increase
of frequency increases the "narrowness" of the reading on the scope,
readjust the settings to widen the sinewave.
When the signal is not at resonance with the coil, the output reading
will be less than the input signal. Once the signal matches the coils
frequency you will see an increase in amplitude/voltage on the scope.
Use JavaTC to find the ballpark frequency of your secondary first...
False readings can occur if you find a harmonic value ( 1/2 1/4 1/6 etc.
of the real frequency)
And finally, Tesla coils are kind of like a radio transmitter but the
general attempt is to produce a single frequency and not modulate that
output ( unless you are into the musical end of T Coiling)
Scot D
Andrew Robinson wrote:
> So I've asked for tuning help before and one or two people responded
> with a link which was somewhat helpful... but now I need to refine
> some questions
>
> What im asking from the list now is two things, one question and a
> confirmation on setup...
>
> First, the general question which applies to all tuning setups. The
> link I was sent to learn to tune the coil can be found here:
> http://myweb.tiscali.co.uk/teslatutorial/MEASUREMENTSPR.htm
> In this explanation (and any other explanation out there) after you
> setup everything you are supposed to turn up the frequency on the
> signal generator until the amplitude on the scope reaches a max. At
> this max is your resonate frequency. Um........ I'm no electrical
> engineer but when you change the frequency shouldn't the sine wave get
> longer and shorter (Freq modulation) not get higher (amplitude
> modulation)????? What am I doing wrong because when I setup the test
> and do exactly what they say to do I dont get their results (amplitude
> modulation) I get frequency modulation as expected....... PLEASE HELP
> (BIGGEST PROBLEM)
>
> See these links to my server for diagrams of my setup. What I really
> need is an explanation of physical setup, not schematic.
>
> Secondary self resonance: http://host.atomiklan.com/tesla/scope1.PNG
>
> In this first setup the signal generator has two ports. A 20v and
> 5v. Which should I use? Also each ports probe has red and black
> alligator clips. Red goes to base of secondary and black goes where?
> Is this diagram correct?
>
> Primary self resonance: http://host.atomiklan.com/tesla/scope2.PNG
>
> In this diagram I just think everything is wrong. Can someone
> please correct my diagrams. Thanks
> _______________________________________________
> Tesla mailing list
> Tesla@xxxxxxxxxxxxxx
> http://www.pupman.com/mailman/listinfo/tesla
>
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