>-
>>>Is there any mileage in making a home brew glitch
>>>resistor for use in series with the B+ using Nicrome
>>>wire on a 1 inch diameter ceramic former?
>-
># I would build one out of grooved Delrin or ABS
># tubing and Ni-Cr resistance wire.
>-
>One group of people I work with will often wind
>their own coils. I've noticed one person found and
>purchased large diameter plastic screws, probably
>from a Company like McMaster Carr in SoCal.
>-
>I haven't had time to check the rf properties of this
>plastic,
ABS and other styrenes have a low dissipation-factor. Delrin has a
medium dissipation-factor. When a commercial "3kW" tuner, which used a
Delrin roller coil form, was tested in the ARRL lab, the roller coil
reportedly melted and ignited.
>but they are winding up a storm for NMR
>probe coils. They seem to be transparent to RF in
>the 45-330MHz range. Heat is not an issue in
>their current applications.
>-
>Might be a source of a "poor mans coil form" which
>works out well.
For up to a few hundred kHz, Delrin is not terrible.
>The home brew coil is much more
>rigid/stable on these large plastic screws. Looks
>like I'll be looking into the source of the bag next
>trip in (later today).
>-
>skipp
>
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- R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K,
www.vcnet.com/measures.
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