First, even a very thin gap may significantly reduce the core permeability. A high quality split core will have its mating surfaces lapped flat.
Second, if the core cracked because of excessive heat, it's likely the ferrite material incurred irreversible damage. Jack K8ZOA On 10/16/2011 5:58 PM, Jim Wiley wrote: > > OK, now I am confused (a normal state of affairs around here) > > > If a "cracked" toroid core is useless, then how do the "split bead" > clamp-on cores manage to work? Isn't the "split" equivalent to as great > big lengthwise crack? > > > I also seem to remember broken ring cores working again when glued > together. > > > After all, isn't a ferrite core itself manufactured from ferrite powder > that has been "glued together" by a binding material? Yes, the > particles are pressed very close to one another,but they are still > individual particles, are they not? > > > - Jim, KL7CC > > > > John Ragle wrote: >> <snip> >> >> I agree with the contributor(s) who said that the cracked toroid is >> basically junk. It has lost its utility because the magnetic circuit is >> broken at the crack. It is unlikely that superglue will restore it. >> >> John Ragle -- W1ZI >> >> >> > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
