[Lowfer] Repairing Ferrites

[Jim]

I know from experience that if you have a coil of wire and insert a 
ferrite bar in it, you see a change of inductance. Then if you put a 
second bar in it, you'll see even more change. The bars don't have to be 
touching or even of the same material. (And  I am talking about a fairly 
small coil of wire--maybe two inches in diameter.)

So I would say your logic is sound. I don't know if two six inch bars 
"glued together" would behave exactly like a twelve inch bar of the same 
material, but you should be able to characterize any differences and 
account for them. I also don't know if a "broken" toroid that has been 
glued back together would behave exactly as it did before, but that 
could also be characterized. The only downside I can think of with 
toroids would be that the "discontinuity" at the break points could 
impact it's self-shielding characteristics to some extent.

I know that I've seen plans somewhere for a linear amplifier that used 
something like four or five rods bundled together to create the core for 
a choke coil.

-- 
73 de
Jim W4JBM

"With a schematic in one hand, a soldering iron in the other, and a puzzled look on his face..."

http://www.hamuniverse.com/w4jbm/