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Re: [TCML] poor coil performance again- help!





bartb wrote:

snippp



If you want a good performing coil, then you need to design with the following in mind:
1) 900 to 1300 turns.
2) H/D ratio between 4 and 5.
3) A coil diameter of 4" or larger.
3) Good static gap with lots of air cooling or srsg.
4) A transformer about 12kV or near with at least 60mA.
5) An MMC cap designed for LTR operation (it's value) for the static gap or srsg (and those values are different).
6) A primary that tunes between 10 and 15 turns.
7) A toroid sized appropriately for breakout, loading size, and as smooth as you can get it.

I find that #7 parameters "following the rule of thumb" is... minor dia.of toriod is approximately = to secondary dia. and the major dia is approximately = to secondary length for a good starting point when building a coil.


Scot D

snipp


It of course takes work, time, and money to make a decent coil. It's not rocket science but there are pit falls to watch out for and experience is the best teacher.

Take care,
Bart

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