Quote:
Originally Posted by G0HZU_JMR
I think it's possible to go beyond what he is doing by using a modern VNA and an RF simulator. The resonance modes usually aren't harmonically related although sometimes it appears like this. Often the resonance modes are grouped closer together and my models predict this correctly.
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Interesting... That's exactly what I found when I put my modest 'sparker' Tesla coil on a VNA. The first resonant frequency is 531.38kHz (sorry, MW DX-ers), then they increase with a diminution in return loss as follows:-
1): 531.38kHz
2): 1470.34kHz
3): 2122.48kHz
4): 2842.9kHz
5): 3409.48kHz
6): 3936.16kHz
Haven't worked out any mathematical correlation as yet.