---
product_id: 157872753
title: "FT-240-43 Ferrite Toroid Core – Mix 43 for RFI Suppression & HF Baluns (2.4\" OD, High Permeability) (PACK OF 1)"
brand: "amidon"
price: "€ 26.37"
currency: EUR
in_stock: true
reviews_count: 8
category: "Amidon"
url: https://www.desertcart.fi/products/157872753-ft-240-43-ferrite-toroid-core-mix-43-for-rfi
store_origin: FI
region: Finland
---

# 1 kW power handling capacity 2.4" OD for versatile winding 20-250 MHz RFI suppression range FT-240-43 Ferrite Toroid Core – Mix 43 for RFI Suppression & HF Baluns (2.4" OD, High Permeability) (PACK OF 1)

**Brand:** amidon
**Price:** € 26.37
**Availability:** ✅ In Stock

## Summary

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

## Quick Answers

- **What is this?** FT-240-43 Ferrite Toroid Core – Mix 43 for RFI Suppression & HF Baluns (2.4" OD, High Permeability) (PACK OF 1) by amidon
- **How much does it cost?** € 26.37 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.fi](https://www.desertcart.fi/products/157872753-ft-240-43-ferrite-toroid-core-mix-43-for-rfi)

## Best For

- amidon enthusiasts

## Why This Product

- Trusted amidon brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Multi-Use Marvel:** Ideal for 1:1, 4:1, 9:1 baluns, common-mode chokes, and appliance noise suppression.
- • **Power Through Your Projects:** Handles up to 1 kW, perfect for high-power HF baluns and impedance transformers.
- • **Cutting-Edge RFI Suppression:** Mix 43 ferrite material expertly filters interference from 20 MHz to 250 MHz.
- • **Thermally Stable Under Pressure:** Maintains peak performance even in demanding thermal environments.
- • **Precision-Sized for Maximum Flexibility:** Generous 2.4" outer diameter fits multiple coax or speaker wire turns with ease.

## Overview

The FT-240-43 Ferrite Toroid Core, crafted from high-permeability Mix 43 material, offers superior RFI suppression across 20-250 MHz. Its large 2.4" diameter supports multiple wire turns, enabling efficient HF baluns and EMI filters. With 1 kW power handling and excellent thermal stability, it’s engineered for professional-grade RF applications and noise reduction.

## Description

The FT-240-43 Ferrite Toroid Core is a high-performance solution for reducing radio frequency interference (RFI) and building efficient impedance transformers. Made with Mix 43 material, this toroid is ideal for applications in the 20 MHz to 250 MHz range, making it a favorite among ham radio operators, RF engineers, and electronics hobbyists. Its large 2.4-inch outer diameter and high initial permeability (µi ≈ 850) allow for multiple turns of coaxial cable or wire, enabling effective common-mode chokes and broadband EMI filters. Whether you're constructing HF baluns, suppressing appliance noise, or improving antenna performance, the FT-240-43 delivers consistent results with excellent thermal stability and power handling up to 1 kW. OD(A) = 2.40 in / 61.0 mm +/- 1.30 mm ID(B) = 1.40 in / 35.55 mm +/- 0.85 mm Ht(C) = 0.50 in / 12.7 mm +/- 0.50 mm AL=1075 +/- 20 % uH=(AL*Turns2)/1000 Temperature Stability (ppm /°C) = 12500 Color Code = shiny black Application Freq Range Wideband Transformers 5 - 400 MHz Power Transformers 0.5 - 30 MHz RFI Suppression 5 - 500 MHz

Review: Worked as expected. - Great quality, and packaging,
Review: Buena calidad y me llegó rápido y bien empaquetado - Excelente

## Features

- Mix 43 Ferrite Material Manufactured by Fair-Rite Designed for RFI suppression from 20 MHz to 250 MHz—ideal for HF radio and EMI filtering
- Large Core Dimensions 2.4" OD × 1.4" ID × 0.5" height—perfect for winding multiple turns of RG-8, RG-213, or speaker wire.
- High Power Handling Supports up to 1 kW—suitable for high-power HF baluns and impedance transformers.
- Versatile Applications Use in 1:1, 4:1, or 9:1 baluns, common-mode chokes, End Fed and OCF antennas, and appliance RFI suppression.
- High Initial Permeability (µi ≈ 850) Enables strong attenuation of unwanted signals with minimal insertion loss. Thermal Stability Maintains performance under demanding operating conditions.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07Y6NQRGF |
| Best Sellers Rank | #33,936 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #8 in Electronic Ferrites |
| Date First Available | September 21, 2019 |
| Item Weight | 4.2 ounces |
| Manufacturer | FRP |
| Package Dimensions | 4.02 x 2.6 x 0.67 inches |

## Images

![FT-240-43 Ferrite Toroid Core – Mix 43 for RFI Suppression & HF Baluns (2.4" OD, High Permeability) (PACK OF 1) - Image 1](https://m.media-amazon.com/images/I/31kaTAxchqL.jpg)

## Questions & Answers

**Q: Are the north and south poles, axially (top and bottom) or diametrically (side to side)?**
A: 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.

**Q: works for dash cam radio interference???**
A: You can use the clip on type for that as well. Get good ones, not unknown cheap chinese.

**Q: Would this help with noise on AM radio? Wrap the antenna wire around and through this?**
A: 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.

**Q: what is the dimater of the inner hole?**
A: 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.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Worked as expected.
*by K***T on September 14, 2025*

Great quality, and packaging,

### ⭐⭐⭐⭐⭐ Buena calidad y me llegó rápido y bien empaquetado
*by A***N on November 3, 2025*

Excelente

### ⭐⭐⭐⭐⭐ good for building RFI and power line nose
*by B***E on July 26, 2025*

made up powerline choke for my radios

## Frequently Bought Together

- FT-240-43 FT240-43 Ferrite Toroid Core 43 Material
- BNTECHGO 16 AWG Magnet Wire - Enameled Copper Wire - Enameled Magnet Winding Wire - 4 oz - 0.0492" Diameter 1 Spool Coil Red Temperature Rating 155℃ Widely Used for Transformers Inductors
- FT-140-43 Ferrite Toroid Core | 43 Material

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*Product available on Desertcart Finland*
*Store origin: FI*
*Last updated: 2026-02-10*