Are the north and south poles, axially (top and bottom) or diametrically (side to side)?

Your question indicates that you assume this product is a magnet. This product is not a magnet. It is a ferrite core used to construct impedance matching transformers by winding wires repeatedly through the center and tightly wrapped around the edges of core.

works for dash cam radio interference???

You can use the clip on type for that as well. Get good ones, not unknown cheap chinese.

Would this help with noise on AM radio? Wrap the antenna wire around and through this?

If the antenna wire is just that a wire then you will only decrease the signal and the noise. Find the source of the noise. LED lights, wall plug-in power sources, or other electrical appliances. If you find the source then maybe using snap on ferrite cores. They see these on Amazon also. I found a source for my AM noise was a power supply for a blue tooth adapter I had. After unplugging this the noise went away. If you shield the antenna as using coax and running an outside antenna wire to get away from the noise that might work also, but that depending where you live might not be possible.

what is the dimater of the inner hole?

I don't have an ID micrometer handy but an eyeball guess with a desk ruler is about 1 3/8 inch. If you need something more precise or in metric, I can figure that tomorrow.

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FT-240-43 Ferrite Toroid Core – Mix 43 for RFI Suppression & HF Baluns (2.4" OD, High Permeability) (PACK OF 1)

FT-240-43 Ferrite Toroid Core – Mix 43 for RFI Suppression & HF Baluns (2.4" OD, High Permeability) (PACK OF 1)

Product ID: 157872753

⚡Supports up to 1 kW power

📏2.4" OD for multi-turn winding

📶Effective 20-250 MHz RFI suppression

10510 Ft

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Description

🔧 Elevate your RF game with the FT-240-43 – where power meets precision!

BUILT FOR POWER - Handles up to 1 kW, perfect for demanding HF baluns and impedance transformers.
SPACIOUS DESIGN - Large 2.4" outer diameter accommodates multiple turns of RG-8, RG-213, or speaker wire effortlessly.
VERSATILE APPLICATIONS - Ideal for 1:1, 4:1, 9:1 baluns, common-mode chokes, and appliance RFI suppression—engineered for pros.
MAXIMIZE SIGNAL CLARITY - High initial permeability (µi ≈ 850) ensures superior EMI filtering with minimal loss.
RELIABLE UNDER PRESSURE - Thermally stable construction maintains peak performance in challenging environments.

The FT-240-43 Ferrite Toroid Core, crafted from Mix 43 material, is engineered for high-efficiency RFI suppression and HF balun construction. With a large 2.4" outer diameter and high permeability, it supports up to 1 kW power and operates effectively across 20-250 MHz. Its thermal stability and versatile design make it a top choice for RF professionals seeking reliable EMI filtering and impedance transformation.

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10510 Ft

Duties & taxes included

In stock

Sold byAmazon HungaryDelivered 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 Hungary.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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Smooth transaction and product arrived in perfect condition.

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FT-240-43 Ferrite Toroid Core – Mix 43 for RFI Suppression & HF Baluns (2.4" OD, High Permeability) (PACK OF 1)

Description

Specifications

Common Questions