[HBR] Coil Forms

[Ed Swynar]

Hi Byron,

That'll work just fine for you, I'm sure  --- I did the very thing here some
time ago with my version of "The Mate for the Mighty Midget" receiver...

Two things:

(1) Do NOT overly tighten/over-torque the mounting screw at the base of the
syrene container, on risk of cracking same, and,

(2) Get a sewing needle: heat it in a candle flame, & then use it to make a
"pin" hole at the side of the form, where you want your coil to start (make
a "handle" for the needle with a few wraps of masking tape --- the body of
it WILL get hot to the touch!). If you can accurately guage the length of
the coil BEFORE winding it, you may wish to add a second pin hole further up
the styrene body, to that pont. When you feed an excess of wire through your
starting pin hole, you won't have to worry about the turns coming loose as
you're winding the coil...ditto, when you're finished winding the coil. By
slipping an ample amount of wire through that second pin hole, your turns
will remain secure and ready for "doping", which in my case amounted to
nothing more elaborate that two coats of clear nail polish.

The process is cheap, simple, & fairly fool-proof to all but the
"...manually dextrous" croed! Hi Hi

~73~ Eddy VE3CUI - VE3XZ


----- Original Message -----
From: "Byron Tatum" <bjtatum at ev1.net>
To: "HBR Receiver List" <hbr at mailman.qth.net>
Sent: Friday, September 15, 2006 9:56 PM
Subject: [HBR] Coil Forms


> Hello-
>     I was studying using the clear styrene straight-sided jars as coil
> forms. Wanted to see if anyone had entertained this idea in past?
>     My thoughts were to drill a hole in the bottom center to mount coil to
> chassis, etc. I found the Parkway Plastics website and the 38 MM OD by
2.7"
> tall jar { 1-1/2 OZ. 38 MM jar} looks pretty close to the 1-1/4" OD coil
> forms specified in a lot of the HBR articles.
>     I have seen a few Millen coil forms that were very similiar to these
> plastic jars.
>     I believe styrene has pretty good RF properties. Anyway, the jars are
> cheap, shipping and handling isn't unless you buy a case!
>                 CUL, Byron.
>
>
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