Barett wrote:

Nice info how to use the AA-200. Thanks

I read on the internet while reading through all the links that I should
make sure when ordering the 2631803802 #31 that they have been coated with a
hardener. Because a ferrite ring #31 that has not been treated with hardener
will break easily because the material will be too brittle.

I have been in touch with http://gb.mouser.com and http://uk.farnell.com
and they both say that there Fair-rite ring 2631803802 #31 does not come
treated with any hardener.

How important is it that they should be treated with hardener and if not
treated how easy are they to break?


Don't worry about it. All ferrites are hard, brittle ceramics, but quite
rugged and not easily broken. They're already harder than most steels,
so I don't really believe they're ever coated with a "hardener". I've
seen them coated with an epoxy type material, but assume that's to make
them less porous and abrasive. It doesn't make them any easier to break.

Roy Lewallen, W7EL

Roy Lewallen wrote:


Don't worry about it. All ferrites are hard, brittle ceramics, but quite
rugged and not easily broken. They're already harder than most steels,
so I don't really believe they're ever coated with a "hardener". I've
seen them coated with an epoxy type material, but assume that's to make
them less porous and abrasive. It doesn't make them any easier to break.


Yes indeed.. they're hard and brittle.. Drop one of those 2.4" toroids
off a ladder onto a concrete floor, and they break.

But other than that, they appear to be pretty tough. The ones I've
gotten don't have any mold flash or lines and are smooth surfaced.

Jim Lux wrote in
:

....
Yes indeed.. they're hard and brittle.. Drop one of those 2.4" toroids
off a ladder onto a concrete floor, and they break.

Or, put two of them loose and with not protection in the post.

Actually, the easiest way I have found to chip them is to thread them on
coax for a W2DU balun, and let them fall just a couple of inches (hang on,
we are metric, that would be 50.8mm).

Owen