Toroid Core FT240-43 Ferrite

Q: What is the max wattage these are rated for. i want to build an unun for an end fed antenna that will handle 600 watts. will 1 or more handle amount?

You should use 2 for 600 watts, the highest rating I have seen for only one is 400 watts. Based on commercial models of end-fed ununs.

Q: I would like to use this on the 11-meters cb band (26.965 - 27.405) will this help to cut down rf returning to the radio?

how many watts? 4 watts isn’t anything to worry about but 500+ watts certainly would be. and yes, wound as a 1:1 choke (or they also call them current baluns) it will absolutely lessen common mode current coming back down the coax. coax coils (mentioned in other responses) are not nearly as effective as a 240-31 ferrite core wrapped as a 1:1 current choke. google “1:1 current balun” or “1:1 current choke” and you will see many examples to guide you. balun btw simply means balanced and unbalanced and they are used to rectify the impedance mis-match between the antenna and the 50 ohm coaxial cable. that generally involves lowering the high impedance of an antenna (200-3000 ohms depending on design) and even then, it should be referred to as a step down transformer but balun (balanced / unbalanced) has become the default term.

Q: Will this work to reduce/remove static noise on a regular FM radio produced from cheap led lighting in a garage?

It likely would with a couple of ifs. It is really large for such a task. The toroidal core would need to be placed as close to the LED power source as possible. Is the FM radio itself close to the LED lighting?

Q: Will this block interference from a treadmill motor? Ethernet over powerline is degraded whenever the treadmill is on.

ethernet over power line is destroying the shortwave radio frequencies , you should run a real cat-5/6 cable or use 5gig wireless.... and you would only need type 73 core for anything the treadmill is hashing out on the airwaves.

4.7/5

Product ID: 503239604

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📏Compact 7.62x2.54x7.62 cm

🔴Type 43 ferrite core

⚖️Lightweight 118g design

Frequently Bought Together

Toroid Core FT240-43 Ferrite

Toroid Core FT240-31 Ferrite

FT-140-43 Ferrite Toroid Core | 43 Material

Description

🔴 Power your circuits with precision and style!

LOW NOISE OPERATION - Operates quietly at 30 dB, ensuring minimal interference in sensitive environments
COMPACT LIGHTWEIGHT - Easily integrates into tight spaces without adding bulk or weight
VIBRANT RED 500 FINISH - Distinctive color coding for quick identification and professional aesthetics
TRUSTED FAIR RITE QUALITY - Reliable performance backed by a leading manufacturer in magnetic components
PRECISION ENGINEERED TYPE 43 CORE - Optimized for high-frequency noise suppression and signal integrity

The Toroid Core FT240-43 Ferrite by FAIR-RITE is a compact, lightweight Type 43 ferrite core designed for effective high-frequency noise suppression. Measuring 7.62 x 2.54 x 7.62 cm and weighing just 118 grams, it operates quietly at 30 dB and features a distinctive red-500 finish for easy identification. Ideal for professionals seeking reliable electromagnetic interference control in compact electronic assemblies.

Specifications

Manufacturer	FAIR-RITE
Part number	FT240-43
Item Weight	118 g
Product Dimensions	7.62 x 2.54 x 7.62 cm; 118 g
Manufacturer reference	FT240-43
Colour	red-500
Material	Type 43
Item Package Quantity	1
Noise Level	30 dB
Measurement System	Metric
Batteries included?	No
Batteries Required?	No

Have a Question? See What Others Asked

What is the max wattage these are rated for. i want to build an unun for an end fed antenna that will handle 600 watts. will 1 or more handle amount?

I would like to use this on the 11-meters cb band (26.965 - 27.405) will this help to cut down rf returning to the radio?

Will this work to reduce/remove static noise on a regular FM radio produced from cheap led lighting in a garage?

Will this block interference from a treadmill motor? Ethernet over powerline is degraded whenever the treadmill is on.

Reviews

4.7

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M**E

Good price and performance

Nicely rounded edges make for a great starting point. I used two of these to make RF chokes with Ultraflex 7. Took 8 turns easily.

10.04.2025

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Smooth transaction and product arrived in perfect condition.

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Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

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