How do I test for resonance

[Tesluh]

lanca, do you hand type the gibberish you use to spam people's threads or do you have a special auto-gibberish generator?

[Tesluh]

I currently have a primary coil that is 78" long 10ga stranded wire with 4 wraps around a 2" tube.
My secondary is two coils about 3" diameter 16ga solid 158" each (twice as long as the primary and when connected at the center should be 4 times as long).

Math I did put the primary to resonate at 37.5mhz.  the nst supposedly puts out something like 9kv at 37.5 kHz.  When I fire up the primary and use what I call a "voltage sniffer" I can put the secondary 5 feet rom the primary and the sniffer lights up brightly.  This tells me that something is happening in the primary to excite the secondary.  I may have to adjust spark gap and primary capicitor to get better resonance in the primary. 

Going to try to get a scope today and see what I get for readings on the primary. I have a capacitor across the primary and one half of the secondary.

This part of it is all tesla coil building, anyone who has built tesla coils and can look over my coils lengths and offer advice for tuning I would be appreciative.

[Tesluh]

https://www.youtube.com/watch?v=TI5XWz8aZvo  this is possibly the most convincing demo of a working assembled Don smith device I have seen.  questioning if my nst is working properly and giving me problems after seeing this video.

[antimony]

I also like to master the knowledge of finding the resonant frequency of a coil, or LC circuit.
I recently bought a cheap function generator from China, but i have a problem with it because it only has one probe, and there seems to have to be two probes when I have searched for tutorials on Google and on YouTube.

[Tesluh]

the "probe" on my function generator has a two pronged lead.  you need the signal generator and an oscilloscope which also has a probe.  I finally was able to get my equipment to determine the resonant frequency of a coil.  I am not sure how exact the frequency i am coming up with is but I get the rising and falling waveform on the scope.  tried three different signal generators (not sure if I was using them correctly) and ended up with this one that has a built in frequency counter.  https://www.amazon.com/gp/product/B0199SVAIY/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1