Meyer-Mace Isotopic NMR Generator

[verpies]

From comments made by Wesley, it looks like the 50 turns winding was being fed with
a waveform of some type in the range of 400 kHz to 600 kHz for some reason. Also it was mentioned by
Weslely that the 50 Hz waveform being fed to the 15 turns winding was a ramp waveform,

Yes, they tried sine, sawtooth and rectangular waveforms to see which one worked best.  I think ramp was the best and rectangular was the worst. They also tried using a 1:25 transformer (1A) to better match to the low impedance of the yoke winding.  I also remember a DC offset being tried, that was larger than the amplitude of the AC signal in order to make the signal unipolar (not reversing polarity).  Tiger's latest experiment demonstrates that a permanent magnet can have the same effect as the DC bias.

Please keep in mind, that coils don't "care" about voltage - they "care" only about current in their windings.

[Void]

Yes, they tried sine, sawtooth and rectangular waveforms to see which one worked best.  I think ramp was the best and rectangular was the worst. They also tried using a 1:25 transformer (1A) to better match to the low impedance of the yoke winding.  I also remember a DC offset being tried, that was larger than the amplitude of the AC signal in order to make the signal unipolar (not reversing polarity).  Tiger's latest experiment demonstrates that a permanent magnet can have the same effect as the DC bias.

Hi Verpies. Ok, thanks. I think I at least have the general idea now regarding the setup, even
if some specific details are not quite so clear.

Please keep in mind, that coils don't "care" about voltage - they "care" only about current in their windings.

It would depend on what you are trying to do, but in this case it appears that a good
current into the 15 turns windings is possibly what is needed.

[verpies]

This was most close resonant harmonics in kHz range to ferrite core resonant frequency. The 50T coil won't accept 1.3MHz frequency.

I'd like to point out that:

1.3MHz * 35 = 45.5MHz
650kHz * 70 = 45.5MHz
500kHz * 91 = 45.5MHz

Read this if you missed why 45.5MHz is special.

[Void]

I'd like to point out that:

1.3MHz * 35 = 45.5MHz
650kHz * 70 = 45.5MHz
500kHz * 91 = 45.5MHz

Read this if you missed why 45.5MHz is special.

Hi Verpies. I have saved that graphic for Iron NMR.
It is something worth keeping in mind for sure.

[skywatcher]

Interesting topic... has anyone continued experimenting on this ?