mini Ring Core Calculator 1.2 Download (Free) – minirk12.exe (informer.com)
Common Mode Chokes, CMC, Line isolators (myantennas.com)
Lets look at a list of Suppliers for Baluns, ununs, Toroids, etc.
DX Engineering Maxi-Core® 20 Baluns and Feedline Chokes –
Index – Fair Rite (fair-rite.com)
Lets also talk “Common Mode Current” or stray RF: