Ferrite Products for RF Chokes, Baluns, and RFI Mitigation
The 2.4" mix 77 is a good way to start, it's big and you should clear coat it to prevent corrosion of the ring.
I used 2 mix 31's stacked with about 8-9 wraps on the XDCR cable as close to the head as you can.
G'Luck!
Ferrite toroid, mix 77
Dimensions:
Length 0.5”
OD 2.4”
ID 1.4”
Price: $7.95