Looking at the continuous air service temperatures for common plastics
shows Teflon = 500F and PEEK = 480F and amazingly Polycarbonate (Lexan)
= 475F. I usually use PEEK as I can get scraps from a local plastic
dealer and it is hard and drills great. You can drill 2 rows of holes
spaced at the turn spacing and separated by the diameter of the coil.
Offset the 2 rows by half the coil spacing. Then wind a coil on a
slightly smaller form and then thread it on to the drilled form. It is
pretty easy to do.
73,
Larry, W0QE
On 7/23/2012 2:38 PM, Gudguyham@aol.com wrote:
> Other than ceramic, can anything else be used as a coil form? Heathkit
> used a fiberglass form in the SB-220. At least I think it was fiberglass.
> Seems to have worked OK. Dentron used what looks to be some type of
> phenolic material. Not really sure what it was. Anything out there that
> can be
> used that does not cost an arm and a leg? I am looking to make a coil for
> RF about 1 1/2" to 1 3/4" dia about 6" long. Not to be used for plate
> chokes. Lou
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