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Strange sweep results
Original poster: "Sundog by way of Terry Fritz <twftesla-at-qwest-dot-net>" <sundog-at-timeship-dot-net>
I have a strange problem. I got my new signal generator (B&K 4001), and
it works like a champ. My scope is giving me some fits (must be jealous),
but everything is working now.
I immediately swept one of my small 2.5" coils. And got the expected
Fres of around 833khz. Sweet. But, upon winding the generator up a bit
more, I ended up with another spike at 2.5mhz.
I'm a bit confused. At harmonics I get a nice double-sine waveform,
with a big and small hump. I've seen it a million times sweeping coils,
but never have I seen a smooth sine wave out of the secondary for anywhere
except resonance. It's strange allright. I can't make heads or tails of
it. I know that Fres is 833khz, that's about what it works out to when I
do it by hand, and that's what the sweep tells me.
Normally, on a harmonic, the amplitude of the input sine is far less
than it is at resonance, but this one is just as strong as the real
Fres. I'm confused now. Should I set my tank frequency to 833khz or
2.5mhz? Or should I try both and see which gives better performance?