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

Amidon Ft 140 43 Ferrite Toroid Core 43 Material

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Description

⚙️ Elevate your RF game with precision ferrite power!

BULK PACKAGING FOR PROS - Cost-effective bulk supply tailored for engineers and hobbyists who demand both value and performance without retail markup.
TRUSTED BRAND RELIABILITY - Manufactured by Fair-Rite, a leader in ferrite cores, ensuring quality and durability for professional-grade electronics projects.
VERSATILE APPLICATION READY - Ideal for power transformers (0.5-30 MHz) and amateur radio antenna builds, enabling low SWR and efficient signal transmission.
ENGINEERED FOR RF EXCELLENCE - Optimized Type 43 ferrite material ensures superior performance across 5-500 MHz frequencies, perfect for wideband transformers and RFI suppression.
PRECISION CRAFTED DIMENSIONS - Exact outer and inner diameters with tight tolerances guarantee consistent inductance and reliable circuit integration.

The Amidon FT-140-43 Ferrite Toroid Core features a high AL value of 885 ± 20% μH, optimized Type 43 ferrite material, and precise dimensions (OD 35.55mm, ID 23mm, Height 12.7mm). Designed for wideband transformers and RFI suppression across 5-500 MHz, it’s a trusted component for amateur radio and power transformer applications, delivered in bulk packaging for professional use.

Specifications

ASIN	B0178IABXW
Batteries Required?	No
Batteries included?	No
Best Sellers Rank	238,231 in Business, Industry & Science ( See Top 100 in Business, Industry & Science ) 216 in Ferrite Cores
Customer Reviews	4.7 4.7 out of 5 stars (303)
Date First Available	27 Oct. 2015
Guaranteed software updates until	unknown
Item Weight	59 g
Item model number	FT140-43
Manufacturer	FAIR-RITE
Material	Type 43 Ferrite
Measurement System	English
Part number	FT140-43
Product Dimensions	5.08 x 2.54 x 5.08 cm; 58.97 g

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C$2683

Duties & taxes included

In stock

Sold byAmazon NicaraguaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Nicaragua.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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Amidon FT-140-43 Ferrite Toroid Core 43 Material

Description

Specifications

Common Questions