Re: question about "lambda" (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

---------- Forwarded message ----------
Date: Sat, 25 Aug 2007 10:42:20 -0500
From: resonance <resonance@xxxxxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: question about "lambda" (fwd)



The correct answer is "where it works best".

I usually use about 1/2 - 1 inch away for most coils.  In large coils 
sometimes you have to go out to 5-6 inches.  You don't want to load the sec 
coil down so make a moveable stick with your wire on it so you can adjust as 
necessary.  Usually, bring it in slowly checking for your signal and then 
clamp it where it gives a good signal without overloading.  1/2 to 1 inch 
usually works well.

I also sometimes leave the insulated wire without stripping it, and then 
just tape this to the topload.  The RF signal goes thru the insulation which 
works good.  On coils above 18 inch dia. you must be a greater distance.


Dr. Resonance


Resonance Research Corp.
www.resonanceresearch.com


----- Original Message ----- 
From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Friday, August 24, 2007 5:16 PM
Subject: Re: question about "lambda" (fwd)



---------- Forwarded message ----------
Date: Fri, 24 Aug 2007 15:58:39 -0500
From: Matthew Boddicker <shmerpleton_town@xxxxxxxxxxx>
To: tesla@xxxxxxxxxx
Subject: Re: question about "lambda" (fwd)

This is Matthew again,

the primary coil is helical and 12 inches in diameter.

So if I have a spherical top load, where do I hold the oscillascope probe?

Thanks,
Matthew Boddicker


>From: "Tesla list" <tesla@xxxxxxxxxx>
>To: tesla@xxxxxxxxxx
>Subject: Re: question about "lambda" (fwd)
>Date: Thu, 23 Aug 2007 20:04:26 -0600 (MDT)
>
>
>---------- Forwarded message ----------
>Date: Thu, 23 Aug 2007 18:36:49 -0700
>From: Barton B. Anderson <bartb@xxxxxxxxxxxxxxxx>
>To: Tesla list <tesla@xxxxxxxxxx>
>Subject: Re: question about "lambda" (fwd)
>
>Hi Matthew,
>
>Tesla list wrote:
>
> >This is exactly what I needed, thank you! So with the wavelength being
>taken
> >into consideration, where would be good spot for the primary coil to be?
>I
> >am currently using a helical primary, but hope to switch to a pancake
> >primary soon.
> >
> >
>First, the primary should be at the opposite end of the hv end.
>Secondly, coupling will identify it's placement with a fixed geometry.
>Whatever your current helical coil is, you'll need to get the coupling
>to a usable level. If the helical is a wide as I think it is, your
>coupling may actually be very low (can you confirm the primary diameter
>again?). Often, when helical's are built, the secondary is adjusted
>above it. This occurs because the coupling was too high and coil to coil
>distance is the only thing that can fix that. But, if the helical is
>made wide enough, then it can be raised higher and higher.
>
> >Also, is there any tips on using a oscillascope to find the frquency of
>the
> >secondary? I've tried it before, but the oscillascope wouldn't give a
>clear
> >reading. I though I heard somewhere that a signal generator could be used
>in
> >conjunction with a oscillascope somehow.
> >
> >
>Yes, use a signal generator connecting the base of the secondary to the
>generator output. You'll then be able to read the signal on the
>oscilloscope. Place the scope probe horizontal with the toroid and about
>1 coil length away with maybe a 4" piece of wire in the probe end to act
>as an antenna. Adjust the signal generator frequency until you see
>voltage amplitude rise. The point at which the amplitude is greatest is
>the fundamental frequency. It's good to calc your fundamental first,
>then adjust the generator below that frequency by some amount before you
>start adjusting the generator. It's good to do this with everything in
>position (primary and topload).
>
>Take care,
>Bart
>
>
>

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