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Re: [TCML] Secondary self frequency
Andrew -
The expected resonant frequency of your secondary ALONE should be around
500 - 525KHz. Adding the toroid should bring this down to around 300KHz. Are
you sure that you had a good electrical connection between the toroid and
the top secondary winding, and that the toroid was "in-circuit"?
Use a multimeter to verify that there is electrical continuity from the
surface of the aluminum toroid down through the grounded end of the
secondary.
As for the performance problem, if the "measured" resonant frequency of the
secondary (with topload) was so far from your "expected" frequency, what
frequency did you tune the primary circuit to? Do you have enough
"adjustment" in your primary to cover the range of 300 to 515KHz?
Regards,
Herr zapp
----- Original Message -----
From: "Andrew Robinson" <teslamad@xxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Thursday, July 02, 2009 9:45 PM
Subject: [TCML] Secondary self frequency
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. I just threw this
website (http://www.teslamad.com) together just now for the purpose of
this email. Please go check out the pics to get a better idea of whats
going on. This coil isnt finished yet. You may have noticed the quickie
ghetto gap and, my old rotary disc from an old BIG coil on my new RSG
mount. In addition to my freq question above, I also have another... im
not getting anywhere near what I expected to, performance wise with this
coil. 2 - 6in max off a break out point. By the way, that toroid i just
got in the mail today from OW landergren... Most amazing craftsmanship I
have ever seen and extremely robust and heavy duty! Took it to the machine
shop today to center tap it and it was "over" a 1/4" thick of aluminum in
the center. Just google them.
I know everyone needs numbers to even begin to help me and I figure I'll
resubmit a detailed report of my findings to the list like I said, next
thursday. Hopefully then with plenty of data, pictures, video, etc...
someone out there will say that catchy phrase "Well theres yer problem!"
Thanks everyone! Hope you all enjoyed my new coil pics... even if it
doesnt work hahahaha.
Regards,
Andrew Robinson
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