Ferrite Toroid FT140-43

Ferrite Toroid FT140-43
Brand: Fair-Rite
Product Code: HG-FT14043
Availability: 34
Price: £3.25 £2.50
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A small ferrite toroid for use in baluns and line-isolators. 8 turns of RG174 (100w) or RG316 (400w) make a great "resistive" balun/choke for 7-30MHz.

SPECIAL PRICE - This batch just £2.50p each!

Our own 100w range of Baluns/Chokes use this ferrite with RG316 coax for a robust and ideal home or portable solution.

  • 175w AM/Digi, 250w SSB (assuming an ideal match)
  • 35.5x23x12.7mm, 1.4x0.9x0.5in
  • Fair-Rite 2643802702 , 43-mix material

If you are building a CobWebb balun, use a pair of FT140-61 which is the correct ferrite mix for the 1:4 balun spec.  If you want to build a QRP balun/choke, we also stock 0.68" dia ferrites in 43-mix here.

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

Toroid sizes/types are easy to ID, the "140" translates to 1.4" (diameter) and the "43" is the ferrite mixture. What type do you need? 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.

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