Re: Strange sweep results

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

Original poster: "rheidlebaugh by way of Terry Fritz <twftesla-at-qwest-dot-net>" <rheidlebaugh-at-zialink-dot-com>

You should have another at 1.66 MHz. You show a primary frequency and the
3rd harmonic. When you use the signal generator your wave shape is usualy of
good quality as it is produced by the generator not the coil. If the test
equipment is not sensitive to impedance problems you see only amplitude
changes across a resistive load like 50 ohms or 600 ohms. When you run the
coil in an oscilator mode is when you see distortion. A poor quality signal
generator is different.
  Robert  H

> From: "Tesla list" <tesla-at-pupman-dot-com>
> Date: Tue, 18 Jun 2002 18:46:02 -0600
> To: tesla-at-pupman-dot-com
> Subject: Strange sweep results
> Resent-From: tesla-at-pupman-dot-com
> Resent-Date: Tue, 18 Jun 2002 18:49:20 -0600
> 
> Original poster: "Sundog by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> <sundog-at-timeship-dot-net>
> 
> 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
> 
> 
>