Re: Strange sweep results

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Terry Fritz" <twftesla-at-qwest-dot-net>

Hi Shad,

I have a sweep movie at:

http://hot-streamer-dot-com/TeslaCoils/Misc/LoadSweep/Animation1.avi

it is a primary secondary system.  It is like 850K but I think you have
high speed access :o))

Your 833kHz coil should have a third harmonic at 2.5MHz and a fifth
harmonic at 4.165 MHz plus or minus "a lot" :o))

You are seeing the "right stuff".  The "double hump" of a Tesla coil's
response.  You want the 833kHz one.  The higher harmonics are not too
important unless you are like me and Paul studying the "nitty gritty" stuff
:o))

Cheers,

	Terry





At 06:29 PM 6/18/2002 -0400, you wrote:
>Hi All,
>
>   I have a strange problem.  I got my new signal generator (B&K 4001), and 
>it works like a champ.  My scope is giving me some fits (must be jealous), 
>but everything is working now.
>
>    I immediately swept one of my small 2.5" coils.  And got the expected 
>Fres of around 833khz.  Sweet.  But, upon winding the generator up a bit 
>more, I ended up with another spike at 2.5mhz.
>
>   I'm a bit confused.  At harmonics I get a nice double-sine waveform, 
>with a big and small hump.  I've seen it a million times sweeping coils, 
>but never have I seen a smooth sine wave out of the secondary for anywhere 
>except resonance.  It's strange allright.  I can't make heads or tails of 
>it.  I know that Fres is 833khz, that's about what it works out to when I 
>do it by hand, and that's what the sweep tells me.
>   Normally, on a harmonic, the amplitude of the input sine is far less 
>than it is at resonance, but this one is just as strong as the real 
>Fres.    I'm confused now.  Should I set my tank frequency to 833khz or 
>2.5mhz?   Or should I try both and see which gives better performance?
>
>Curious,
>
>  Shad G3-1203
>