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Help Finding Overtones, Again



Original poster: FIFTYGUY@xxxxxxx

In a message dated 12/15/04 1:46:05 PM Eastern Standard Time, tesla@xxxxxxxxxx writes:
BTW, any luck measuring those overtones?


I obtained another hand-me-down HP oscillator, this time a model 220A Square Wave Generator that goes to 10MHz.
Well, my lab technique leaves a lot to be desired. My scope shows an awful lot of ringing on those square waves, so much that it becomes pretty much ALL ringing over 2MHz. Wimpy output, at only about 1V P-P or so. I can see why I ended up with it - what good is 1V of VHF? Be lucky to make snow on the TV...
Anyhow, I found NO evidence of ANY overtone when using it to base drive the secondary coil. I.e., voltage across the generator stayed absolutely the same with or without the coil as a load. Running it at resonance absolutely drove the poor generator nuts, however. Made a big fuzzy mess on the scope screen. Despite all the ringing, I expected SOMETHING to happen in the 1-2MHz range you had predicted.


-Phil LaBudde