Party cup baffles Was - RE: Ryan's Coil = Salvaged :-)

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

Original poster: "Garry Freemyer by way of Terry Fritz <twftesla-at-uswest-dot-net>" <Garry-at-NDFC-dot-com>

Plastic cups make great baffles, at least for me they did. They are easy to
cut and place and they are cheap! I have used party cups as well as the
plastic cups from fast food places. I had to cut them so they would fit
snugly and then I glue them in place and then spray and spray several coats
of poly over it to close up any remaining gaps. I've had no trouble with
this method. Just make sure you remember to remove any metallic stickers
from the cup before inserting.

-----Original Message-----
From: Tesla list [mailto:tesla-at-pupman-dot-com]
Sent: Tuesday, January 09, 2001 6:51 PM
To: tesla-at-pupman-dot-com
Subject: Re: Ryan's Coil = Salvaged :-)


Original poster: "J. B. Weazle McCreath by way of Terry Fritz
<twftesla-at-uswest-dot-net>" <weazle-at-hurontel.on.ca>

At 07:11 PM 09/01/01 -0700, you wrote:
>Original poster: "Ryan Ries by way of Terry Fritz <twftesla-at-uswest-dot-net>"
<spud-at-wf-dot-net>
>
>Okay, it looks like I live on to coil another day.  I'm not sure what all
>was said about the thicker PVC and absorbing more RF, but I was able to
>completely sand away the carbon track and reveal fresh PVC underneath.
>I then applied a new coat of polyurethane to the inside of the form.
>It's drying as we speak...
>
>Ryan

Hi Ryan,

At the very least I think you should cut yourself some baffle disks and
glue them in place inside your secondary form to create two or three
compartments.  This will aid in preventing a recurrance of your inside
arc-over which was likely caused by your initial tuning error.  

I'd glue the baffles in place on a very dry day so that there is mimimal
moisture trapped within the secondary.  On my new secondary which I'm in
the process of building at this time, I'm going to purge the inside with
dry nitrogen gas before sealing it up.


73, Weazle, VE3EAR/VE3WZL

Listening: 147.030+ and 442.075+
E-mail:    weazle-at-hurontel.on.ca
           or ve3ear-at-rac.ca
Web site:  www.hurontel.on.ca/~weazle