toroid core

Coil Designer - Mk 2 - This page lets you do calculations for single layer air cored coils using the solenoid formula

Balun construction - problems with iron cores - Lots of information and measurements relating to HF baluns and transformers constructed using Iron Powder cores

Transformer for Ground-Independent Receiving Antennas - Transformers theory and calculator of turns on binocular cores. Comparison with toroid cores.

1:6 Balun for HF - PD2HFE project of a 1:6 Balun for HF Bands using a T-200 toroid core

Core Baluns - About core baluns, measurementes, basic theory and calculations

Guanella 1:1 VHF choke balun - A model of a Guanella 1:1 VHF choke balun using a FT140-61 core

4:1 balun for 160 to 10 meters  ^pop - Articke By Clay Wynn

4:1 balun project - CVARC 4:1 Balun Project Kit by AE6YC

Ham Radio Contest Maps - US Contesters maps generated based on ARRL online score data by WM5R

WY4Y Zebulon Contesting and Awards Club - The primary objective of ZCC is to promote Amateur Radio use by awarding members for achievements in the Awards section. Free membership and awards program. Scores and awards posted on our web site.

Anteny SP1BKS - Antenna manufacturer from Poland, produce dipole wire antennas, W3DZZ FD4 Windom and long wires, baluns, dealer for toroids and connectors managed by Leszek Mlynarczyk SP1BKS

Misek Antenna Research - Publisher of The Beverage Antenna Handbook. Supplier of transformer cores, clips and FET's used in Beverage Antenna construction.

Communication Coil - Communication Coil, Inc. designs and produces custom, high reliability Filter Networks, RF Coils, Chokes, Inductors, Baluns, Toroids and Power Magnetics for communications

Filtronetics Inc - Maker of filters, oscillators, cristals Coils, Toroidal Inductions, Solenoids, Bifilar wound Solenoids, Trifilar Solenoids and Transformers Located in Kansas City, Missouri

Wire Harness Assemblies - Printed Circuit Board, Custom Overmold Cable Assembly, Box Build, System Integration, Sheet Metal

Balloon or kite antenna? Why not - Balloon antennas, mainly about using 2 balloons instead of one for a vertical antenna.

Chushcraft A3S - Simple Balun Support - A method for supporting a balun on a Chushcraft A3S antenna. This allows the balun to be isolated from the boom, thus reducing the effect of introduction of reaction with the balun core.

Kits and Parts dot Com - Supplying Toroids, Electronic Parts and Kits to Engineers, Schools and Hobbyists. Capacitos, filters, inductors, qrp products

ABBA Electronics - Italian dealer for electronic components, toroids, cabling surplus, amateur radio products

Universal Score Uploader - A free Windows application which allows you to post ham radio contest scores to getscores.org portal

Antenna Selector - This project was built to be able to experience with more of an antenna and also in turn to be able to have a system that offers security to the receivers, carrying out the discharge to ground of the antennas

Coil Inductance Calculator - Calculate the inductance of a single-layer, air-core coil.

Tutorial on ferrite balun cores - Toroid cores, ferrite rods a good electrical tutorial on baluns

Winding Toroids - A Guide to safely wind toroidal cores by vu2fd

Ferrite for RFI - Ferrite cores for RFI Suppression