[TowerTalk] Ferrites 31 vs. 77 material

[Bob Shohet, KQ2M]

Back ~ 2000, I was using 77 material vs. 43 material for Ferrite chokes and I constructed an impedance table by freq.to determined how many beads I should use on each band.  Now we talk about and use 31 material instead.  What I don’t recall is what happened to the 77 material and why 31 material has seemingly supplanted it.

I would appreciate any thoughts/comments/comparisons on this.

Tnx &73 


Bob KQ2M