I have progressively added some further materials to Ferrite permeability interpolations calculator. Of interest to European designers is inclusion of three common materials used for HF applications, Ferroxcube’s 4A11, 4B2, and 4C65. Last update: 22nd September, 2018, 7:27 AM
At Feasibility study – loop in ground for rx only on low HF – small broadband RF transformer using medium µ ferrite core for receiving use – 50:200Ω I laid out a design using Fair-rite a #43 ferrite smallish binocular core. #43 is a medium permeability NiZn ferrite. I have been asked by several correspondents … Continue reading Loop in ground (LiG) – #5 – small broadband RF transformer – discussion of ferrite material choice
A simplified design for small broadband RF transformers using medium µ ferrite core for receiving use. The specific application is an impedance transformer for a nominally 200Ω antenna to a 50Ω receiver input. Intended frequency range is from 0.5 to 15MHz. The characteristic of typical medium µ ferrite mixes, particularly NiZn, are well suited to … Continue reading Loop in ground (LiG) – #3 – small broadband RF transformer using medium µ ferrite core for receiving use – 50:200Ω
Many of my articles call for finding the complex permeability of a ferrite components from manufacturer’s data. Let’s explore an example used in a recent article, Another small broadband RF transformer using medium µ ferrite core for receiving use – 50:450Ω. The core used was a Fair-rite ferrite core of #43 material, and the magnetising … Continue reading Online calculator of ferrite material permeability interpolations
A simplified design for small broadband RF transformers using medium µ ferrite core for receiving use. The specific application is an impedance transformer for a nominally 450Ω antenna to a 50Ω receiver input. Intended frequency range is from 0.5 to 15MHz. The characteristic of typical medium µ ferrite mixes, particularly NiZn, are well suited to … Continue reading Another small broadband RF transformer using medium µ ferrite core for receiving use – 50:450Ω
A simplified design for small broadband RF transformers using medium µ ferrite core for receiving use. The specific application is an input transformer to a nominally 2kΩ receiver at around 9MHz (a panadapter). The characteristic of typical medium µ ferrite mixes, particularly NiZn, are well suited to this application. This article continues with the design … Continue reading Another small broadband RF transformer using medium µ ferrite core for receiving use – 50:3200Ω
This article is a walk through of a process for designing a toroidal ferrite cored inductor for radio frequencies. Designing with magnetics can be a complicated process, and it starts with using reliable data and reliable relationships, algorithms, and tools. Last update: 21st September, 2019, 6:30 PM
The ARRL handbook for radio communications (Ward 2011) gives guidance on designing with ferrite cored inductors: Ferrite cores are often unpainted, unlike powdered-iron toroids. Ferrite toroids and rods often have sharp edges, while powdered-iron toroids usually have rounded edges. Because of their higher permeabilities, the formulas for calculating inductance and turns require slight modification. Manufacturers … Continue reading ARRL guidance on design of ferrite cored inductors
Binocular ferrite cores are widely used, but not so widely understood. Understanding inductors is an important first step to understanding transformers are they are coupled inductors. The usual use of them is to make a winding of several turns around the central limb. One turn is a pass through both sides of the core around … Continue reading Thoughts on binocular ferrite core inductors at radio frequencies
Discussion at A method for design of small broadband RF transformers using medium µ ferrite core for receiving use was around a 9:1 transformer on a BN43-2402 core. In that design, 4t was proposed as a suitable winding for a nominal 50Ω primary. This article describes a 4:1 transformer needed for a project and based … Continue reading A prototype small 4:1 broadband RF transformer using medium µ ferrite core for receiving use