Re: [TCML] 40AWG secondary coil

[Ed Phillips <evp@xxxxxxxxxxx>]

Hello, everybody,

I was reading, recently, about a coil that was using 34AWG wire for the secondary and was ran at low power levels (150VA) without any racing sparks or any other forms of damage. I was wondering if it would be possible to use a secondary wound with 40AWG wire, or if this would just be a ridiculous idea.

I understand that it would be extremely difficult to wind a secondary with this thin of wire, and that the chances of the wire breaking are large, but I'm looking for more of a proof than an efficient coil. The form I would be using is a cardboard one with a spray-coat of polyurethane, 1.5" diameter by 7" height."

	Assuming a winding factor of about 0.9 I figure the inductance of that secondary would be about 24 mH and the self-resonant frequency around 620 kHz without top load.  I'll have to dig out the exact details but I have a similar secondary wound with #39 wire.  Think it's about 1.8" dia x 6" long.  Resonant frequency without top load is a bit over 650 kHz.  Works fine with a power input of around 30 watts and gives 4" streamers.  Winding this thing was a terrible pain because of the problem with crossed over turns.  I have a small hand cranked winder and had to stop and unwind several turns more than once to get it completed.  Took several hours but when it was done the thing looked pretty good.

	Bottom line is that it WILL work but it's going to be a real chore getting decent windings.

Ed


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