How much power will a balun made from an FT140-43 handle?

The maximum power has to do with the permeability of the material and the field strength your coil generates. If you exceed the maximum power, you won't damage the unit, but will incur losses as the ferrite material is saturated and cannot support an increased magnetic field. I'm using a single FT140-43 for a 49:1 UNUN (16 gage wire) running at 10 watts max for portable field operations, and it works very well for this application. According to my calculations, it could handle up to 37.5 watts CW or 60 watts SSB. If you need more power, I would recommend stacking two FT140-43s, and you could double the power, i.e. 120 watts SSB / 75 watts CW. If you're looking for even higher power, I would look at using an FT240-43 or FT240-52 core.

Brand	FAIR-RITE
Manufacturer	FAIR-RITE
Model number	FT140-43
Number of Memory Sticks	1
Item Weight	59 g
Product Dimensions	5.08 x 2.54 x 5.08 cm; 58.97 g
Item model number	FT140-43
Item Height	2 Inches
Item Width	1 Inches
Are batteries included?	No

Toroid Core FT140-43 Ferrite

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