RE: Construction techniques (attaching toroid and secondary coil)

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Ted Rosenberg by way of Terry Fritz <twftesla-at-qwest-dot-net>" <Ted.Rosenberg-at-radioshack-dot-com>

Brett:
My 2 cents in case you want to get fancy.
I wanted ease of connecting in this coil
The secondary is a 6.125" diam PVC thin wall.
I sealed the bottom (top too) with a disk of PVC.
Then I attached a 2.5" shower drain screw fitting to the bottom (Lowes has
them).
Next I cemented a 2" plug to the center of the shower screw also cemented to
the bottom disk. BUT BEFORE cementing, I threaded the bottom end of the
secondary winding through all these fittings using a 1/16" drill bit hole
and soldered the lead to the center and the ground tab of a PL-259 surface
mount connector available from RadioShack.

I know this all sounds more complicated than it actually is.
But the net result is that my RF ground cable (#4 welding) terminates in a
PL-259 plug that quickly screws onto the female socket at the bottom of the
secondary once the secondary has been screwed into the female shower socket.

If you need more info, let me know off list and I can send you a drawing.

Safety First

Ted
-----Original Message-----
From: Tesla list [mailto:tesla-at-pupman-dot-com]
Sent: Sunday, October 14, 2001 10:41 PM
To: tesla-at-pupman-dot-com
Subject: Re: Construction techniques (attaching toroid and secondary
coil)


Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<FutureT-at-aol-dot-com>

In a message dated 10/14/01 3:47:16 PM Eastern Daylight Time, 
tesla-at-pupman-dot-com writes:

> My questions are:
>  
>  1) What is a good way to attach the secondary coil to the stand without a

>  bolt running through the end cap?  Anyone have any suggested techniques?

Brett,

Some folks have problems with sparks shooting down through the
secondary form, but I never had that problem.  I leave my forms open
at top and bottom, and just put a wooden bar across.  I then attach
the toroid to that.  Sometimes I do close the ends, but i don't seal
it in any special way.  I don't get caught up in lots of unneeded
details, because most of my coils are for research, not looks.
I usually install a wooden post (broomstick) at the bottom of the
secondary, and this fits into a socket in the coil base or stand.
This lets me easily raise or lower the secondary for coupling 
adjustment.

>  
>  2) What is the best way to attach the toroid to the top of the coil?  

I basically use the bolt method you spoke of.  I didn't have any problems.

John