---
product_id: 444008308
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: "AR$154292"
currency: ARS
in_stock: false
category: "Amidon"
url: https://www.desertcart.com.ar/products/444008308-ft-240-43-ferrite-toroid-core-mix-43-for-rfi
store_origin: AR
region: Argentina
---

# Supports up to 1 kW power handling 2.4" OD large core for multi-turn winding Effective RFI suppression 20-250 MHz FT-240-43 Ferrite Toroid Core – Mix 43 for RFI Suppression & HF Baluns (2.4" OD, High Permeability) (PACK OF 1)

**Brand:** amidon
**Price:** AR$154292
**Availability:** ❌ Out of 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?** AR$154292 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.com.ar](https://www.desertcart.com.ar/products/444008308-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

- • **Powerhouse Performance:** Handles up to 1 kW, perfect for high-power HF baluns and impedance transformers.
- • **High Permeability Magic:** Mix 43 material with µi ≈ 850 ensures minimal insertion loss and superior attenuation.
- • **Broadband RFI Suppression:** Optimized for 20-250 MHz to crush interference and boost signal clarity.
- • **Built to Last Under Pressure:** Thermally stable design keeps performance consistent in demanding environments.
- • **Precision-Sized for Maximum Flexibility:** Generous 2.4" outer diameter fits RG-8, RG-213, and speaker wires with ease.

## Overview

The FT-240-43 Ferrite Toroid Core by Amidon is a high-permeability Mix 43 ferrite designed for professional-grade RFI suppression and HF balun construction. With a large 2.4" outer diameter, it supports multiple wire turns and handles up to 1 kW power, making it ideal for demanding RF applications between 20 MHz and 250 MHz. Its thermal stability and low insertion loss deliver reliable, interference-free performance for engineers and hobbyists alike.

## 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

## 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 |
| Are batteries included? | No |
| Best Sellers Rank | #221,102 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #85 in Ferrite Cores #22,845 in Lab & Scientific Products |
| Brand | Amidon |
| Date First Available | 22 February 2020 |
| Item Weight | 118 g |
| Item part number | FT-240-43 |
| Manufacturer | Amidon |
| Net Quantity | 2.0 Count |
| Number of Memory Sticks | 1 |
| Package Dimensions | 10.21 x 6.6 x 1.7 cm; 118 g |

## 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)
![FT-240-43 Ferrite Toroid Core – Mix 43 for RFI Suppression & HF Baluns (2.4" OD, High Permeability) (PACK OF 1) - Image 2](https://m.media-amazon.com/images/I/31pD3iabY0L.jpg)
![FT-240-43 Ferrite Toroid Core – Mix 43 for RFI Suppression & HF Baluns (2.4" OD, High Permeability) (PACK OF 1) - Image 3](https://m.media-amazon.com/images/I/21eTMRmSE6L.jpg)
![FT-240-43 Ferrite Toroid Core – Mix 43 for RFI Suppression & HF Baluns (2.4" OD, High Permeability) (PACK OF 1) - Image 4](https://m.media-amazon.com/images/I/81AqQXEUpeL.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.

## 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 Argentina*
*Store origin: AR*
*Last updated: 2026-03-07*