[HBR] 5-pin Coil Form

[Bob AH7I]

The brown pill bottles are usually polypropylene.
They seem OK for 40meters. Have not used elsewhere.

Some of the clear ones are polystyrene.

Here are plastics identification symbols
http://www.atomic.princeton.edu/~kuzma/chem/plastic.html

here is a chart of dielectric and loss properties
http://www.eccosorb.com/sales/Dielectric_Chart.pdf

according to the chart, polyproplene is not too far from polystrene as far
as loss goes.

-Bob
been busy with home renovation and motorcycles lately
be selling a bunch or radio and electromechanical stuff soon so I sell the
house.


On Fri, 2 Feb 2007 hbrnut at earthlink.net wrote:

>
> >Has anyone had experience purchasing/using 5 pin coil forms
> >www.tubesandmore part number P-C211 dimension  2 5/16 in H x 1 1/4 in
> >Diam "standard" 5-pin base @ $6.95 each?
>
>
> I have used them and do not recommend them. They are a two piece design, with the base glued to the actual form. After repeated inserting and removing from the socket, the glue gives way and the base separates from the form.
>
> There is a fellow reproducing the polystyrene forms. They are a little pricier at $10 each, but might be worth it if they last.
>
> Darrell, WA5VGO
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>
>
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