Re: indication of good tuning (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

---------- Forwarded message ----------
Date: Thu, 02 Aug 2007 03:05:34 -0700
From: Barton B. Anderson <bartb@xxxxxxxxxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: indication of good tuning (fwd)

Hi Matthew,

A helical primary has high coupling due to the parallel arrangement and 
proximity. In most cases to keep the coupling to a reasonable level, the 
primary top turn is near the bottom secondary turn. This changes with 
proximity. The further the helical primary is from the secondary, the 
higher the primary can be positioned. But, this gets bulky and awkward 
to design (it's a lot of work to build a helical primary and having to 
rewind to a larger or smaller diameter is not fun), so often the primary 
is raised or lowered to accommodate coupling.

A flat primary has the ability to offer low coupling due to it's 90 
degree angle to the secondary. Of course, high coupling can still be 
easily achieved. But, flat primary's actually fit the bill for typical 
Tesla Coils. Their easy to make, all the coupling your coil can handle, 
and easy to mechanically position tap changes in inductance for tuning. 
That's why their so popular.

I've built some helical primary's and flat primary's. One thing to keep 
in mind, is that your finding a balance between coupling, required 
inductance, and physical size. Sometimes, a slight inverse cone can help 
compact the design. But flat is simply easy and trouble free.

Take care,
Bart

Tesla list wrote:

>---------- Forwarded message ----------
>Date: Thu, 02 Aug 2007 12:20:21 -0500
>From: Matthew Boddicker <shmerpleton_town@xxxxxxxxxxx>
>To: tesla@xxxxxxxxxx
>Subject: Re: indication of good tuning (fwd)
>
>I use a cylindrical primary, would that mean that the secondary needs to be 
>a few inches above the middle of the primary?
>
>Better yet, is a pancake the best primary form to build?
>
>Thank you.
>Matthew Boddicker
>
>
>  
>
>>From: "Tesla list" <tesla@xxxxxxxxxx>
>>To: tesla@xxxxxxxxxx
>>Subject: Re: indication of good tuning (fwd)
>>Date: Thu, 2 Aug 2007 11:04:19 -0600 (MDT)
>>
>>
>>---------- Forwarded message ----------
>>Date: Thu, 2 Aug 2007 12:04:36 -0500
>>From: resonance <resonance@xxxxxxxxxxxx>
>>To: Tesla list <tesla@xxxxxxxxxx>
>>Subject: Re: indication of good tuning (fwd)
>>
>>
>>I think you are referring to the fact that a coil reaches a very high
>>potential prior to breakout, and after breakout this potential begins to
>>drop depending on the "air load".
>>
>>For nice sparks and good performance, tune for maximum smoke!  No,
>>seriously, tune for best spark length.  Don't overlook coeff. of coupling
>>adjustments by raising sec coil.  In many cases max spark length will be
>>achieved when sec base winding is elevated 3-5 inches above the horizontal
>>pri plane.
>>
>>With our 18 inch dia sec coil, best performance at 6.5" elevation.  With 
>>our
>>24 inch dia. sec coil, best performance is hit at 8.5 inch elevation.
>>Experiment with your setup.
>>
>>
>>Dr. Resonance
>>Resonance Research Corp.
>>www.resonanceresearch.com
>>
>>
>>----- Original Message -----
>>From: "Tesla list" <tesla@xxxxxxxxxx>
>>To: <tesla@xxxxxxxxxx>
>>Sent: Thursday, August 02, 2007 11:16 AM
>>Subject: indication of good tuning (fwd)
>>
>>
>>
>>---------- Forwarded message ----------
>>Date: Thu, 02 Aug 2007 11:05:24 -0500
>>From: Matthew Boddicker <shmerpleton_town@xxxxxxxxxxx>
>>To: tesla@xxxxxxxxxx
>>Subject: indication of good tuning
>>
>>Hi everyone, this is Matthew Boddicker.
>>
>>Around five months ago read that a coil is properly tuned when it has the
>>maximum spark length coming out of the top load.
>>
>>I also heard a logical argument saying, "Having sparks coming out of the 
>>top
>>load is wasted energy, showing that the coil isn't properly tuned due to 
>>its
>>inefficiency." Something to that effect anyway.
>>
>>So what is the best indication of a properly tuned coil? Minimal spark
>>length or maximum spark length?
>>
>>Thanks!
>>
>>_________________________________________________________________
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>>
>>
>>
>>
>>    
>>
>
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