[RFI] Big Type 31 Toroid Cores

[Kimberly Elmore]

I have some FT240-31 (cores and now have a couple of the type 31 big cores - 4" OD, 3" ID and 1" depth. Looking at Fair-Rite's site, I see the following values fr single-turn impedance values:
P/N             2631814002                     2631803802             4" OD 3" ID 1" depth     2.4" OD 1.4" ID 0.5" depthFreq            1 turn Z (ohms)             1 turn Z (ohms)1 MHz         14                                      125 MHz         31                                      2810 MHz+         45                                      4025 MHz+         76                                      63100 MHz+ 175                                    119250 MHz         500                                    215
The big cores (first column) don't create a lot more impedance per turn until frequecy exceed 100 MHz. But, I know that one of the limiting charateristics for CMCs is distributed capacitance between turns (see K9YC's treatise), expecially when coax is used. But.given the same size of coax, wouldn't we be able to put the same number of turns on a large core than a small one, or, alternatively, more turns, before reaching the limits imposed by distributed capacitance between the turns? Along, of course, with the added benefit of higher power caoability for the larger cores. For example, if the practical limit for RG8 coax through a 2.4" core is 5 turns, I'd like to think I'd be able to get, say, 7 or 8 turns on the 4" core before reaching the limit imposed by distributed capacitance. Am I missing anything?
Kim N5OP