[Lowfer] Loading Coil Former ?

Wed, 22 Oct 2003 22:39:48 -0500

Sounds like you did car audio before.

Mike>WE0H

-----Original Message-----
From: [email protected] [mailto:[email protected]]
On Behalf Of Eric Smith
Sent: Wednesday, October 22, 2003 10:30 AM
To: [email protected]
Subject: Re: [Lowfer] Loading Coil Former ?

Looks like someone who knows answered the technical aspects of your
question.  For stiffening, I've had good results using plywood to stiffen
flimsy fiber cylinders (in another hobby of mine :).  You can:

* Use a plywood disk with a routered slot around the edge to accept the
cylinder.  Spar urethane or porch paint protects exposed portion from wx.

* Use a plywood ring cut out with a router (jig-saw works too, not as nice
a circle) to fit tight over the end and then screw with brass screws from
the inside of the tube into the rings which are on the outside of the
tube.

* Wooden disk on inside -- spokes may be cut out for weight.

Of the three, I'd recommend #1 or #2.

Never tried this stuff for a loading coil
but these methods have worked for me when stiffening flimsy fiber tubes.

Eric

On Wed, 22 Oct 2003, John Andrews wrote:

> Peter,
>
> > Just picked up a large fiber barrel for a loading coil duty. It's 23 In
> > dia. by 32 In tall. It has one end-piece of same filer. Only issue is
> > with the two steel end rings about the circumference. What is the
> > liability of having them in the coils proximity??
>
> Lower L, lower Q, due to eddy currents in the "shorted turn." If you can
cut
> them to open the turn, do it.
>
> John Andrews
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