Much has been written about Delrin roller coils melting and.or combusting
in the presence of high RF potentials. Apparently, the blame is two-fold:
1. Oren Elliott Products, Inc. decided to switch from a ceramic roller
coil form to a coil form made from Delrin. However, if the company
powers-that-be had done their homework, they would have known that Delrin
has roughly 20-times the D-factor of polyethylene, good-quality ceramic
and Teflon.
2. When Elliott Inc. changed to Delrin, if the tuner manufacturers that
used Elliott roller coils had done their homework by re-testing, they
would have discovered that Delrin can melt/combust around high RF
potentials.
Sure, Delrin can typically be used for spreaders on 300 ohm ladder-line
in open air, except perhaps in July and August, with a SB-200, but the
high potentials typically encountered in an antenna tuner's roller
inductor(s) with 1500w of RF can cause Delrin to melt and combust. .
Rich---
R. L. Measures, 805-386-3734, AG6K
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