Re: [TCML] Secondary self frequency

[Ed Phillips <evp@xxxxxxxxxxx>]

   Late message because I've been out of town.  I use a home grown 
program to calculate SRF and here's what I get, based on a winding 
factor [turns / turns with no spaces] of 0.98:

Diameter = 4.5 "
Winding length = 18" [You didn't say whether the 18" was winding length 
or total form length]
SRF = 555 kHz
Self capacitance = 7.6 uufd
Top load capacitance = 19.4 uufd
Loaded resonant frequency = 295 kHz
Turns = 653
DC resistance = 12.4  ohms

Not too far from what you got so your results don't sound strange to me.

Ed



Andrew Robinson wrote:

> Does this sound strange to anyone. A 4" OD x 22" (windings) secondary 
> using 22 gauge wire with a 4.5" x 18" spun alum toroid having a self 
> res freq of around 515kHz? I ran the tests in the lab today and thats 
> what im getting. For some reason though, I had reason to believe it 
> was going to be much lower. I'm gonna resubmit this email next 
> Thursday when I get a chance to get back in the lab and im gonna take 
> a video of myself taking the measurements. Maybe im just doing 
> something wrong. 

> ------------------------
>
> Regards,
> Andrew Robinson 



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