Yes, on a Tektronix TDS220.
> How could you tell in was 3X freq?
The waveform was changed on that frequency and I measured the period
of the new waveform. The two were sine waves.
The input waveform changes when I reach 6 MHz, from above or below,
to the new 3X sine waveform.
> What was the amplitude output/input
10 V in / 3 V out
> - was it phase locked -
Yes, it was.
> as if not, it would look like 3X. There is a point when inductors start to
> look like capacitors and this is the SRF or Self Resonate Frequency.
Hum... I'll try more turns ...
> Also, there are many different ferrites (the lower the 'u' the higher the
> frequency - normally). Ferrite does have hysteresis where mixing of
> frequencies can happen. If there is phase lag/lead - around the SRF usually,
> then you could generate harmonics (3rd being the strongest with symetrical
> quadrature waveforms). The real question is - what are you trying to do - or
> prove?
Prove nothing, just trying to find the ferrite's resonant frequency.
Marcelo