1/4 Wave Theories - do a test?
From: Mad Coiler [SMTP:tesla_coiler-at-hotmail-dot-com]
Sent: Thursday, June 04, 1998 3:41 PM
Subject: Re: 1/4 Wave Theories - do a test?
>From: Malcolm Watts [SMTP:MALCOLM-at-directorate.wnp.ac.nz]
>Sent: Wednesday, June 03, 1998 10:24 PM
>To: Tesla List
>Subject: Re: 1/4 Wave Theories - do a test?
>> From: Mad Coiler [SMTP:tesla_coiler-at-hotmail-dot-com]
>> Sent: Monday, June 01, 1998 9:45 PM
>> To: tesla-at-pupman-dot-com
>> Subject: Re: 1/4 Wave Theories - do a test?
>> I am not yet the most knoledgeable on the theories of the Tesla Coil
>> (but I am getting there), but I have one idea about the 1/4 wave
>> conflict. Why not just do a simple test.
>> Now - please dont jump down my throught or anything - but do tell
>> if there is some problems with my idea.
>> Build (if you dont have on already) a Tesla Coil that is designed
>> that its length of wire on the secondary is equal to the 1/4
>> This will only work if you have a larger toroid you can also run the
>> system with. Measure the maximum spark length produced by your 1/4
>> Tesla Coil. Then put a larger toroid on it that brings the frequency
>> below that of when it was equal to the 1/4 wavelength. See if spark
>> length increases. If it does increase this could mean many things but
>> comes down to the simple fact that it worked better than it did when
>> was equal to the 1/4 wavelength. I know that many other factors can
>> change but what does it really matter if you trying to get the most
>> spark length - and one way gives you more spark?
>It matters if you are trying to determine what parameters if any are
>> For example, I have tried this. I have a small 3.5" diameter
>> that has 500' of wire in it. Running it at around 400kHz (1/4 wave
>> equals 616') it has almost double the spark length and several times
>> power as when I run at the 1/4 wave frequency. And yes, the coil was
>> fully retuned for all experiments.
>OK - you must be running it with a larger terminal at the lower
>#1 - top storage capacity is increased lowering the impedance
>delivering energy into the output discharge. More of the energy
>ending up in the secondary is on tap to feed the discharge in a
>shorter time than if it had to come from the coil itself.
>#2 - if you tapped in more primary turns, primary Q is higher as gap
>loss is reduced. This can make a very significant difference to
>output in many systems. I noted exactly this by eliminating a source
>of loss in a small system last night *without retuning a thing*.
>You didn't say whether spark gap settings were the same, nor did you
>say whether you increased your primary capacitance. Be interested to
>hear what exactly you changed.
The only thing changed is the toroid and primary tap.