Topband: Recycled ferrites for 160m

[G4GED Dave]

Hi Topbanders,

My query revolves around the suitability, for 160m applications, of recycled 
ferrite material extracted from redundant CRT TVs and PC Monitors ?

Thanks to the Flat-screen revolution, there's now lots of this recycled 
ferrite freely available from CRT - Flat upgrading. There's lots of 
satisfaction to had saving all this good stuff from simply ending up wasted 
in another land fill project and it costs nothing !

There's the big chunky dougnut/bagel shaped ferrite core from the scanning 
coil yoke, two of which, as common mode chokes, have successfully killed my 
160m-ADSL RFI stone dead.
I have several doing service as chokes in RX antenna feeders. They seem to 
work but how well, I've no means of knowing?

Most PCs and monitor mains power leads incorporate an embedded chunky 
tubular ferrite, easily removed with a hot air gun and craft knife.

There's often a variety of other small ferrite rings, tubes and beads etc to 
be had from within this redundant equipment.

Does anyone know what ferrite "mixes" all these are likely to be or how they 
could be simply  tested at home for suitability as rf xfmrs, baluns, chokes 
etc on Topband ?

Thanks
Dave