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Re: question about "lambda" (fwd)



---------- Forwarded message ----------
Date: Thu, 23 Aug 2007 14:03:24 -0500
From: Matthew Boddicker <shmerpleton_town@xxxxxxxxxxx>
To: tesla@xxxxxxxxxx
Subject: Re: question about "lambda" (fwd)

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.

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.

Thank you,
Matthew Boddicker


>From: "Tesla list" <tesla@xxxxxxxxxx>
>To: tesla@xxxxxxxxxx
>Subject: Re: question about "lambda" (fwd)
>Date: Tue, 21 Aug 2007 21:11:06 -0600 (MDT)
>
>
>---------- Forwarded message ----------
>Date: Tue, 21 Aug 2007 19:56:48 -0700
>From: Barton B. Anderson <bartb@xxxxxxxxxxxxxxxx>
>To: Tesla list <tesla@xxxxxxxxxx>
>Subject: Re: question about "lambda" (fwd)
>
>Hi Matthew,
>
>Wavelength is the distanced traveled by a wave in one cycle. Lamda is
>the symbol to represent one complete wavelength (one complete cycle).
>The term wavelength is "distance". Wavelength = velocity / frequency.
>The velocity of a radio wave (air or vacuum) is 186,000 mi/s (speed of
>light). Therefore, a wavelength or lambda in miles = 186,000 /
>frequency. Often however, it's best to use SI units system when dealing
>wavelength. For the speed of light in cm we have 3 x 10^10 cm/s. Lamda
>in cm = 3 x 10^10 / frequency. So for any coil, you can simply find the
>distance traveled by the wave in one cycle by dividing the speed of
>light by the frequency.
>
>The phase angle comes into play with 1/4 wave and 1/2 wave values. At
>1/4 wave, the phase angle is 90 degrees and results in a maximum value
>at one end and a minimum at the other end (the coil). So, at 1/4 wave,
>we have maximum voltage at the top and minimum voltage at the bottom,
>this in turn results in minimum current at the top and maximum current
>at the bottom.
>
>Does that help any? If not, I recommend googling wavelength. Probably
>some good stuff out there. As far as applications, well, their various.
>Note, if it's coil related, our coils are 1/4 wavelength designed for
>the classic 2 coil system, but some also build 1/2 wave coils as well.
>This puts the maximum's at each end of the coil so the coil itself is
>positioned horizontally and usually with a primary center to the coil.
>Obviously for 1/4 wave coils, we mount the coil vertical so the maximum
>voltage end is above everything else.
>
>Take care,
>Bart
>
>Tesla list wrote:
>
> >---------- Forwarded message ----------
> >Date: Mon, 20 Aug 2007 12:40:41 -0500
> >From: Matthew Boddicker <shmerpleton_town@xxxxxxxxxxx>
> >To: tesla@xxxxxxxxxx
> >Subject: Re: question about "lambda" (fwd)
> >
> >It's Matthew Boddicker.
> >
> >When you say 1/2 or 1/4 wavelength, 1/2 or 1/4 of what? What would be a 
>full
> >wavlength? I guess a more accurate question would be, what is the 
>fraction
> >compared to?
> >
> >Thanks,
> >Matthew Boddicker
> >
> >
> >
> >
> >>From: "Tesla list" <tesla@xxxxxxxxxx>
> >>To: tesla@xxxxxxxxxx
> >>Subject: Re: question about "lambda" (fwd)
> >>Date: Thu, 16 Aug 2007 20:44:34 -0600 (MDT)
> >>
> >>
> >>---------- Forwarded message ----------
> >>Date: Thu, 16 Aug 2007 19:33:46 -0700
> >>From: Barton B. Anderson <bartb@xxxxxxxxxxxxxxxx>
> >>To: Tesla list <tesla@xxxxxxxxxx>
> >>Subject: Re: question about "lambda" (fwd)
> >>
> >>Hi Matthew,
> >>
> >>Lambda in the electrical sense is simply wavelength, thus 1/2 wavelength
> >>or 1/4 wavelength.
> >>
> >>Wow, 4 pF? Very low and little energy for spark creation. Your question
> >>is very interesting. But, how about some specifications on the coil
> >>parameters?
> >>
> >>Take care,
> >>Bart
> >>
> >>Tesla list wrote:
> >>
> >>
> >>
> >>>---------- Forwarded message ----------
> >>>Date: Thu, 16 Aug 2007 14:25:18 -0500
> >>>From: Matthew Boddicker <shmerpleton_town@xxxxxxxxxxx>
> >>>To: tesla@xxxxxxxxxx
> >>>Subject: question about "lambda"
> >>>
> >>>Hi, this is Matthew Boddicker
> >>>It's either a brain-fart or just a lack of reading the right 
>information,
> >>>but what exactlty does "1/2 lambda" and "1/4 lambda" mean exactly?
> >>>
> >>>Also, probably tied into the same subject, I was tuning my coil by 
>moving
> >>>
> >>>
> >>an
> >>
> >>
> >>>alligator clip connecting the wire from the primary coil to the 
>capacitor
> >>>
> >>>
> >>>from the max inductance down to the minumum. I was getting very little
> >>
> >>
> >>>sparks at the beginning, even when I had  the primary circuit the same
> >>>calculated frequency as the secondary. The capacitor is 4.075 
>picofarads.
> >>>The "tuned" circuit, to match the same frequency of 438 kHz secondary, 
>is
> >>>being given an inductance of 32 microhenrys. But at this inductance (a
> >>>grounded rod was held 3.5" away from the top load), there was a tiny 
>bit
> >>>
> >>>
> >>of
> >>
> >>
> >>>purple corona. This observation was consistant until I hit an 
>inductance
> >>>
> >>>
> >>of
> >>
> >>
> >>>11microhenrys when many sparks broke out between the top load and the
> >>>grounded object. This frequency for the primary is calculated at 
>752kHz.
> >>>That's over 300kHz off! why does that work!?!?!
> >>>
> >>>Thanks,
> >>>Matthew Boddicker
> >>>
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