RE: NEW COIL FIRING!
Subject: RE: NEW COIL FIRING!
From: richard.quick-at-slug-dot-org (Richard Quick)
Date: Sat, 28 Jan 1995 17:06:00 GMT
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* Originally By: Bhaley-at-shore-dot-net
* Originally To: Richard Quick
* Originally Re: RE: NEW COIL FIRING!
* Original Area: UUCPE-Mail
* Forwarded by : Blue Wave v2.12
Date: Sat, 28 Jan 1995 05:36:57 -0500
To: richard.quick-at-slug-dot-org (Richard Quick)
From: bhaley-at-shore-dot-net (Brendan Haley)
Subject: Re: New Coil Firing!
> * Original msg to: Tesla-at-grendel.objinc-dot-com
> > From: bhaley-at-shore-dot-net (Brendan Haley)
> BH> OK, here's a question, and I hope I describe it correctly.
> BH> I just got my first coil working, with the help of
> BH> everyones postings, (thank you).
>Great Work! Please tell us more!
> BH> I wound the secondary on regular PVC pipe (4 in. diameter),
> BH> which I know now is somewhat of a no-no.
>I have never heard of anyone's first coil being perfect!
> BH> The question is: the winding stops about 4 inches from the
> BH> top of the pipe. There is one sweeping wind from the end of
> BH> the tight winding up to the top, where the discharge
> BH> terminal is. Does this spread out the capacitance along
> BH> this long wind, and away from the terminal. I have noticed
> BH> that there is corona all along this wind, and the sparks
> BH> seem to get stronger near the tight winding.
> BH> I am planning to cut off the rest of the pipe anyway, but I
> BH> am curious as to whether my intuition is correct (allthough
> BH> I doubt it)... Any kind responses are appreciated. Thank you
> BH> -Brendan
>The only problems you are having is that: your discharger is
>mounted too high up off the top of the secondary winding; your
>discharger is too small in diameter; or both.
>Cut the coil form down to 1 inch above the winding, and properly
>cap the coil. I just use scrap pieces of squarely cut PVC pipe as
>insulating spacers to change and adjust the height of the
Not to harp on the subject, but why does the distance between the winding
and the discharger matter: i.e. what physical phenomenon is occurring. Is
it extra resistance from the wire, or capacitance? Normally I would
envision the points as electrically equivalent, regardless of this length.
I know I am wrong in assumming this, and I am curious as to why.
Also, while I'm asking, what purpose does the discharger serve? A coil
still produces the wireless power transmission without the capacitive hat.
And finally, could you explain the role of the spark gap. I've seen it
described as providing "harmonically rich" current in order to cause the
tank circuit to oscillate. That is both nebulous and suspicious sounding to
me. Is the spark gap width important in the tuning, or is it fine merely
Sorry to ask so many questions, but now that I finally got the thing
working, somewhat, I am filled with curiosity. I was hesitant to ask
these questions until I had a working coil, and now I feel more involved.
So, any suggestions that would help me on my quest to becoming a better
coil builder are greatly appreciated.
P.S. Thanks for the congratulations
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