ferrite core

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ferrite core

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Antennas : Baluns
  • OH7SV Windom baluns - Windom baluns for kilowatt range made with two ferrite toroidal cores amidon ft-140-61 and another schema with two ferrite rods
    [ Hits: 3831 | Votes: 11 | Rating: 7.64 ]
Antennas : Baluns : 1 to 1 Balun
  • How to Build a UN-UN - Building a 1:1 balun, aka un-un, with an Amidon Ferrite toroid core T 200
    [ Hits: 1063 | Votes: 6 | Rating: 4.17 ]
  • Sorbie Balun and Bottle Choke - Homebrew a 1:1 balun consistsing of 4+4 turns of mini coaxial cable over a large ferrite core by m0pzt
    [ Hits: 702 | Votes: 1 | Rating: 1 ]
  • How to build a Coax Balun 1:4 and 1:1 - An air-wound balun made with coaxial cable can not become saturated because no powder iron or ferrite core is present. In this article author explains and compare coax baluns to ferrite baluns with comparison tables and detailed pictures
    [ Hits: 577 | Votes: 8 | Rating: 8.63 ]
Antennas : End-Fed : End Fed Half Wave Antenna
  • EFHW autotransformer comparison - Two different ways to create autotransformer for end fed half wave wire antennas, by using ferrite or air core.
    [ Hits: 521 | Votes: 3 | Rating: 2 ]
Antennas : Feed Lines : Choke
  • Patented RF choke test - A reproduction test of a a binocular ferrite core and winds a total of 7 turns is a patented rf choke with an unusual winding, although this winding scheme reduces the inductance, it might result in a much larger bandwidth over which the choke has a sufficiently large impedance. The Author test this model by reproducing the choke.
    [ Hits: 105 | Votes: 0 | Rating: 0 ]
Antennas : Theory : Impedance matching
  • Performance of 49:1 Ferrite Core Transformers - There are quite a few recipes for building a suitable transformer for an end fed half wave antenna (EFHW), but I was never sure I really understood the main principles. So, I wound a bunch of transformers, made measurements on them using my NanoVNA, learned how to get what I really wanted out of the VNA measurements, and in the process discovered how to build better transformers and be able to predict what they will do
    [ Hits: 151 | Votes: 4 | Rating: 7 ]
Manufacturers : Baluns
  • Palomar Engineers - RFI Kit, ferrite cores, baluns, loop antennas, antenna tuners and various accessories
    [ Hits: 7894 | Votes: 16 | Rating: 5.87 ]
  • Amidon Inc. - Ferrite Toroids. Iron Powder Toroids. Ferrite Beads. Split Cores. Cable clamp-ons. Balun Cores. W2FMI Baluns and Ununs. Inductive components for EMI Suppression and RFI Suppresion, power supplies, HAM radio.
    [ Hits: 2080 | Votes: 4 | Rating: 5.75 ]
Manufacturers : Filters
  • Olympix - Performance RFI Filters that work right at the noise sources, ferrite cores.
    [ Hits: 296 | Votes: 0 | Rating: 0 ]
Shopping and Services : Electronic Components
  • Ferrite Shop - Ferrite-shop is an on-line shop for ferrite toroids, cable cores and cable clamps based in The Netherlands
    [ Hits: 174 | Votes: 0 | Rating: 0 ]
Software : Circuit Design
  • Coil32 - Coil32 is a free coil inductance calculator, that allows to calculate: single layer and multi layer air core coils, toroidal air core coils, inductors on ferrite rings, in pot core, flat coils on the PCB, and also LC resonance parameters. The program have additional plugins to calculate another kinds of coils. The application is free for usage and distributing.
    [ Hits: 1571 | Votes: 6 | Rating: 7 ]
  • mini Ring-Core-Calculator - Calculate windings on ferrite cores - The program can be used to calculate inductors (coils) and their number of turns on ferrite cores, ferrite shells and air coils. These can be used for baluns, Ununs, bandpass filters, low pass filters, resonant circuits, and more. The technical specifications of the cores are already integrated in the program. Application is free and runs on Windows 32 bit versions only. To make it run on Windows 10 64 bit need to be unzipped in a single folder.
    [ Hits: 390 | Votes: 1 | Rating: 1 ]
  • FT CALC 1.3 - Ferrite Toroidal Core HF Calculator - This EXCEL Program Worksheet calculates the safe operating conditons for a toroidal transformer operating between 1 and 50 MHz. Manufacturer data for complex permeability, magnetic dimensions, and saturation flux density must be available. Some core types which are commonly used in amateur transmission are included. The program produces limiting winding voltages for linear operation and temperature rise over the range of frequencies and power specified.
    [ Hits: 283 | Votes: 1 | Rating: 2 ]
Technical Reference : Amplifiers : HF Amplifiers
  • LA7MI 40W RF Amplifier for 80m - 40W Linear Power amplifier with FETs for 80m Some notes about saturation in ferrite- and iron-cores. Written by LA7MI Stein Torp, N-5005 Bergen
    [ Hits: 3024 | Votes: 2 | Rating: 1.5 ]
Technical Reference : Components : Toroids
  • Ferrite information - Ferrite Toroidal Cores, Magnetic Properties of Ferrite Materials, EMI - RFI Suppression Design Considerations, Ferrite Beads, Ferrites for RFI Ferrite Cores for RFI Suppression by CWS ByteMark
    [ Hits: 13699 | Votes: 4 | Rating: 5 ]
  • Ferrite and common-mode choke - Finding the the best ferrite material for a common-mode choke. How to create efficient ferrite cores and how to measure them
    [ Hits: 184 | Votes: 1 | Rating: 10 ]
Technical Reference : Electronics
  • Using ferrite for interference suppression - Excellent guide to using ferrite cores for interference suppression. Understanding and Solving RF Interference and Noise Problems by Jim Brown K9YC Audio Systems Group, Inc. PDF File
    [ Hits: 6152 | Votes: 6 | Rating: 9.5 ]
Technical Reference : Radio Frequency Interference : Noise Reduction
  • How to make a mains filter for EMC and noise reduction - Article showing how I've made a mains filter to reduce EMC in the electricity supplying my shack. I've used a type 31 Fair-Rite ferrite core and the video shows how this performs on 160m through to 40m.
    [ Hits: 1222 | Votes: 5 | Rating: 9.6 ]
  • DIY EMC/RFI Mains Filter for a Clean Shack - Utilizing snap-on ferrite cores and practical insights, the author enhances their shack's cleanliness against electromagnetic interference. With meticulous experimentation and installation, they improve noise levels across HF bands, reflecting on the effectiveness of their filter in minimizing common-mode disturbances. Updates underscore ongoing refinement and cautionary advice for optimal filtering and radio reception amid changing RF environments.
    [ Hits: 69 | Votes: 1 | Rating: 10 ]

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