Vasik,
I followed PP.pdf and used my current probe as indicator.
I shorted the Grenade (½ wavelength) and used the Inductor to scan for peaks using my FG.
Found first peak at 1.377Mhz and second at 5.777Mhz.
So now trying to use 137Khz in FFT mode to get the subharmonic for the both peaks, but things are not clear from there, so will continue tomorrow.
Itsu
Itsu, here as I understand the procedure: First you find two regions where coil resonates (with sine). For your coil they will be around 1.3 and 5.7Mhz. Regions, I mean around the peak, where amplitude it still high (e.g. 1.2 - 1.4 Mhz or something like this). Like Sergey has first peak at 910Khz, he selected first region 830-1100Hhz and second peak somewhere 4.625 Mhz he selected region 4.62-4.63Mhz You also check with your hand lower frequency, if it is "proper" resonance, amplitude will grow when you put hand on the coil. (I think it is a property of 1/2 wave resonance) Then you switch to meander square wave and slowly go through first region (120 - 130Khz, first region divided by 100), writing down frequencies which give maximum close to 1.3Mhz Sergey found 84.2khz, 87.4khz, 90.8khz, 94.5khz for his coil. Once you have list of these frequencies, you try them one by one and select one which gives you maximum close to 5.7 Mhz. Sergey selected 90.8khz for his coil. So push pull frequency can 15 or 30Khz (probably 24-26 for your coil, 120-130/5). Vasik
« Last Edit: 2021-05-13, 17:11:31 by Vasik041 »
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