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 Material 43

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Description

⚙️ Elevate your RF game with precision and power!

WIDEBAND FREQUENCY RANGE - Optimized for 5-400 MHz, perfect for versatile transformer and RFI suppression needs
TRUSTED BY RF ENTHUSIASTS - Preferred choice for low SWR antennas and reliable power transformers
ROBUST FERRITE CORE DESIGN - Lightweight yet durable at just 59g, built to last in demanding electronic environments
HIGH PERMEABILITY 43 MATERIAL - Delivers superior inductance and minimal signal loss for professional-grade performance
PRECISION ENGINEERED DIMENSIONS - Ensures seamless integration with your custom RF projects

The FT-140-43 Ferrite Toroid Core by Fair-Rite features a high AL value of 885 ±20%, supporting wideband frequencies from 5 to 400 MHz. With precise dimensions (OD 35.55mm ±0.75mm, ID 23.0mm ±0.55mm, height 12.7mm ±0.50mm) and lightweight design (59g), it’s engineered for efficient wideband transformers, power transformers, and RFI suppression. Trusted by amateur radio and electronics professionals alike, this core delivers consistent, high-performance inductance for advanced RF applications.

Specifications

ASIN	B0178IABXW
ASIN	B0178IABXW
Batteries Included?	No
Batteries Required?	No
Customer Reviews	4.7 4.7 out of 5 stars (301)
Customer reviews	4.7 4.7 out of 5 stars (301)
Date First Available	23 September 2024
Date First Available	23 September 2024
Is Discontinued By Manufacturer	No
Item Weight	59 g
Item model number	FT140-43
Item model number	FT140-43
Manufacturer	FAIR-RITE
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
Product Dimensions	5.08 x 2.54 x 5.08 cm; 58.97 g

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SAR 77

Duties & taxes included

In stock

Sold byAmazon KSADelivered 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 KSA.

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TrustScore 4.5 | 7,300+ reviews

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Amidon Ft-140-43 Ferrite Toroid Core, Material 43

Description

Specifications

Common Questions