Very good info, Joel, and I enjoyed all the presentations and the fellowship.  It was good to get together again.  For those who have unknown ferrite toroids (such as those available at the Wye Mountain sale), here is a method to determine what type they are.  I used this to decide that the ones I got were 240-31's.  It's simple, just wind several turns and measure R and X.  Look at the chart and see where R and X are equal.  In my case, R and X were equal at about 3.6 Mhz, so I believe mine are type 31's.  Owen Duffy is a trustworthy source, like Jim Brown and Tom Rauch. 

73,

Dennis/W5RZ