news.albasani.net wrote:
wrote:
Ok, dumb question. Can a Iron Powder Toroid be used outside without
being weatherproofed? Can it be painted with enamel and the used that
way? -Scott, WU2X


Hmmm, from the others answers, I suspect they all have only dealt with
cores which have come coated with some protective coating (paint,
enamel, etc.)

I took it for granted you were speaking of the ones which can be cheaply
obtained, at times, which have not passed specs but are completely
usable; however, the manufacturer neglected to coat them ... without
coating the core shows oxidation damage with time.

Regards,
JS

Out of curiosity, I immersed a 37 uH
inductor wound on an FT37-43 core in tap
water. Using a (1 kHz) inductance meter,
I saw no change in inductance.
Unfortunately my bench has been co-opted
by other projects and a measurement of Q
at RF is in its own queue.

Also, from the Micrometals website:

"Micrometals recommends that all
uncoated cores should be sheltered from
high humidity or rain since they will
eventually form surface rust."

73,

Chuck

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