Ferrite Toroid FT240-61

A large ferrite toroid which is ideal for an UnUn - both our 9:1 UnUn products use this ferrite  It is not suitable for general-purpose baluns/chokes across HF - use a 31-mix , 43-mix or a 75-mix.

• Size: 60.0x35.5x12.7mm, 2.4x1.4x0.5in
• Fair-Rite 61-mix material

Need help choosing a ferrite?  See our page on selecting the best size/type here.

Toroid sizes/types are easy to ID, the "240" translates to 2.4" (diameter) and the "61" is the ferrite mixture. What type do you need? 61 is good for an UnUn, 43 is good from 7MHz and up (and a good general-purpose 7-30MHz solution) while 31 is good for lower HF bands. Remember, you can stack the cores for increased choking and power-handling. As always, ratings need to factor in the aerial (SWR) match and duty-cycle.