Re: trading toploads. (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

---------- Forwarded message ----------
Date: Tue, 09 Oct 2007 18:21:57 -0700
From: Barton B. Anderson <bartb@xxxxxxxxxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: trading toploads. (fwd)

Hi Scott,

The 12x30 galv. elbows will be very near a 12x30 toroid. With the 7x24 
under it, it's about 38.8pF combined. You can achieve near the same C 
with an 8x33 toroid (again with 7x24 below it). There isn't enough 
difference in outward size to cause a large shift with topload to coil, 
so the frequency will be very near and would only require minor tuning. 
I think this is what your after. Anything relatively close 8x30 to 8x34 
should be fine.

Take care,
Bart

Tesla list wrote:
> ---------- Forwarded message ----------
> Date: Mon, 8 Oct 2007 17:34:29 -0400
> From: Scott Bogard <teslas-intern@xxxxxxxxxxx>
> To: tesla@xxxxxxxxxx
> Subject: trading toploads.
>
>
> Hey guys,
>
>      I am currently using a top load made of 12-in galvanized steel
> elbows.  It is too heavy, and not very smooth, for these reasons I don't
> like it.  I need to make a new one that is lighter, without sacrificing
> capacitance, and I seem to be limited to Al-duct that is 7-8in, instead of
> 12.  The overall diameter of my toroid is about 30 inches, and the chord
> diameter is obviously 12.  What should I use, and how big should it be, so
> I don't need to completely re-tune.  I might also note, that I stack two
> toploads, a smaller 7*24 and the bigger 12*30; one rests atop the other.  
> Thanks in advance.
>
> Scott Bogard.
>
> _________________________________________________________________
> Help yourself to FREE treats served up daily at the Messenger Caf?. Stop by today.
> http://www.cafemessenger.com/info/info_sweetstuff2.html?ocid=TXT_TAGLM_OctWLtagline
>
>
>
>
>
>