[TowerTalk] Ferrites 31 vs. 77 material

[Jim Brown]

On 11/2/2019 6:25 AM, Roger Parsons via TowerTalk wrote:
> The posts from both N6RK and AB7E support my statement that variability in ferrite parameters has been known for a very long time. You're the one who asserted that it has just been discovered and that therefore Steve G3TXQ could not have known about it.

Roger,

This comment smells much like an argument to me than a discussion. Yes, 
the variability has been known for a long time -- but mostly by those 
engineers working with these components in manufacturing. And because I 
had not been doing that kind of work, I slept through the significance 
of it with respect to common mode chokes, as I suspect Steve did. 
Indeed, my comments were specifically meant to NOT disparage his 
technical capability, which I respect, but simply to observe that his 
specific recommendations were not valid.

73, Jim K9YC