Gosh, I hope not. I used carbon film 1/4w 5% standard DigiKey issue.
That 6th harmonic thing I haven't actually tracked down, but it appears to be happening at a particular frequency around 20 mhz.
After thinking about it, I ran those tests again with the FFT on and found that "whatever" harmonic was going though that frequency got a heck of a boost, it must be a really nasty peak there....
Which indeed might be added inductance. Do they do the spiral thing on those tiny guys? As this goes on I might well try to find something better - maybe carbon composition (does anyone still sell them)?
The only carbon comp R's I've seen for sale lately are specials, rather low values (10k ish) and rated for high peak drop voltages (hard to arc internally or fry unless rating is exceeded long enough for bulk heating?).
We'll see where I wind up. For now this is good for all my high turns ratio ferrite core type stuff. We're buying a VNA in case we want that down the road, but it might need some mods to do measurements more than its built in 1 mW....
VNA linkYou'd think if ions could be made to be present (they can in this lashup) that this might reveal at least a little about their motions even at this low level...and a lot of this should kinda scale (it will be nonlinear, but in a moderately predictable way - and I just need to get on the right page here).
Posting as just me, not as the forum owner. Everything I say is "in my opinion" and YMMV -- which should go for everyone without saying.