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.

What is the country of origin?

Faur-Rite Brand (the manufacturer) FT140-43 are manufactured in China.

Where do you put these , on the wire or somewhere else ? I see some say wrapping the wire , do you run it in and out of the ring ?

Yes you run it in and out of the ring as many times as it can.

Can this be used for long wire unun balun? some sites suggest t-130 hence the question.

Yes. I wrapped mine with #12 antenna wire as a choke between my elevated radials and earth ground. Major improvement to my signal strength. K5AE

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⚙️ Elevate your electronics with precision-engineered magnetic mastery!

BULK PACKAGING FOR PROS - Supplied in bulk to meet the demands of serious engineers and innovators—no retail fluff, just pure performance.
ENGINEERED FOR PRECISION - Exact dimensions ensure seamless integration into your high-performance circuits.
BROAD SPECTRUM RFI SUPPRESSION - Effectively minimizes interference from 5 to 500 MHz, keeping your signals crystal clear.
OPTIMIZED MAGNETIC PERMEABILITY - AL value of 885 ±20% guarantees consistent inductance for reliable power and signal transformers.
VERSATILE FREQUENCY COMPATIBILITY - Supports power transformers from 0.5 to 30 MHz and wideband transformers from 5 to 400 MHz—future-proof your designs.

The Toroid Core FT140-43 Ferrite by Fair-Rite is a high-quality passive component designed for advanced electronic applications. With precise dimensions (35.55mm OD, 23mm ID, 12.7mm height) and a high permeability AL value of 885 ±20%, it excels in wideband and power transformer roles across 0.5 to 400 MHz frequencies. Ideal for RFI suppression up to 500 MHz, this core is a must-have for professionals seeking reliable, interference-free circuit performance.

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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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