toroid core

Balun and Transformer Core Selection - Occasionally errors are made regarding core selection. This especially includes baluns, where on occasion some very strange ideas surface.

The 9:1 balun  ^pop - Antenna special on hard-core-dx.com

Homebrew Balun Case - Balun case construction, tipically to host toroid cores. Size of case depends on power to handle. By DL5DBM

Balun single core 4:1 analysis - Real 4:1 Transmission Line Balun with Balanced Load

ZS6KMD Nescafe 4:1 Balun - Making a 4:1 balun with a nescafe coffee jar lid and a toroid

Why terminate a Beverages - Terminating the far end of the Beverage makes it unidirectional. It also makes the receiving angle of the antenna lower.

Poor ground, better Beverage - Poorer conducting earth beneath a Beverage gives better performance

Illinois QSO Party - The Radio Amateur Megacycle Society

Oklahoma QSO Party - Sponsored by the Oklahoma DX Association

RTTY Contests - Calendar with scores and rules of recent and upcoming RTTY contests

DK2AB Core blog - Amateurfunk blog

DX Portal - Google based ham radio search engine. Only trusted, useful web sites for amateur radio. The DXPORTAL search engine built using Google's core search technology, which prioritizes search results based on amateur radio websites.

Kiwa Electronics - Kiwa Electronics is a company that specializes in accessory equipment for the radio enthusiast. Our products include Filter Modules to improve receiver performance, a High Performance Medium Wave Air Core Loop Antenna for improved broadcast band reception, the Pocket Loop Antenna, the Earth Monitor, BCB Rejection Filter and Broadband and SW Preamps. We also offer numerous performance upgrades for popular receivers.

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.

Kits and Parts dot Com - Supplying Toroids, Electronic Parts and Kits to Engineers, Schools and Hobbyists

Italtras - Power transformers for electronic, toroidals,three-phases

Cabrillo Evaluator by W3KM - Cabrillo Evaluator Software by W3KM free software loads Cabrillo log files, evaluates and scores them.

HL1INF RF Amplifiers - Circuits, pictures and data about toroids, tubes and home made power 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

Mini Ring Core Calculator - The easy way to calculate toroid cores.

Assessing unknown Ferrite Toroids - Ok so you have had a good day at the Rally and you have come back with a carrier bag full of ferrite toroids that "just might be useful for something". How do you find out what they are? Very few seem to be stamped with any indication of their properties, and some are 'painted' garish colours which presumably means something.

Toroid Winding - Winding Toroids can be a real hassle for those of use who are left-handed or not so dexterous as we once were.

Winding style of toroid chokes and baluns - Dispels myth about choke balun winding method

Choosing Wire Size for Toroidal Inductors - Measurements that show it doesn't make much difference

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