Re: Help Finding Overtones, Again

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Gerry Reynolds" <gerryreynolds@xxxxxxxxxxxxx>


Hi Phil,

Just to make sure,  did you terminate your signal source in 50 ohms at the
load end of a 50 ohm coax?? I'm assuming the 220A has a 50 ohm source
impedance.

Gerry R.


> 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
>
>
>