[RFI] Ferrite bead disintegration

[Ken Winterling]

Pete,

I have seen mechanical stress do this.  You didn't indicate the physical
construction technique used to build the choke but it is possible that
movement of the beads against one another caused them to crack.

Ken, WA2LBI


On Mon, Aug 23, 2010 at 09:10, Pete Smith <n4zr at contesting.com> wrote:

> I took apart a home-made 100 bead receiving-only common mode choke
> yesterday.  As I peeled off the electrical tape I was surprised when
> each bead that came out of the wrapping disintegrated into dozens of
> fragments.  I think I saved about 5 beads out of a 100-bead choke.
>
> What could have caused this?  The choke was used over 300 feet away from
> my transmit antennas, and never used for transmitting.  Morte to the
> point, can I expect to see the same thing in the feedpoint chokes of my
> 80m 4-dipole lazy vee array, which have been up and in use for ~10 years?
>
> --
> 73, Pete N4ZR
>