toroid wound

Petlowany Antennas by K6NO - WorldRadio Article on Petlowany antennas base on this principle: if a length of wire is wound into a spiral-shaped coil and excited by a radio frequency current connected to the innermost portion of the coil, it will then, and only then, exhibit RF characteristics that closely approximate those of a resonant linear wire of the same length

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

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

1:6 Balun for the HF bands - 11 wdg bifilar on Amidon T 200-2 Toroid core

A 4:1 Air-wound Balun - 40mm diameter grey PVC pipe with a length of 9.5cm

A 4:1 Air-wound Balun - Homebrew a 4 to 1 air wound balun

An Improved Multiband Trap Dipole Antenna - This improved multiband trap dipole introduces a new trap design and a change in trap location. The antenna features double-coaxial-cable-wound traps having lower reactance and a higher quality factor (Q) than earlier coax-cable traps by W8NX

Winding an Effective 1:1 Coax Balun - Guidelines to wound a balun by WA2SRQ

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

Cleveflex - Clevaflex is a manufacturer of flexible wound tubing that can be used in a variety of applications. our unique manufacturing process allows tubes to be designed and built with a multi-ply convoluted wall contour that creates a permanently bonded tube.

The ElectraSlide Antenna - Modification of the DK3 design by Don Johnson, W6AAQ. No voltage dropping, operates on the full 12 volts. The control switch and the matching toroid are supplied. All you need is a standard 3/8 by 24 thread ballmount, 2 wire sheilded microphone cable for control wiring, and a CB whip cut to resonance.

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

Fixing the LDG Z100 ATU - Repair LDF Z-100 toroid by VK4ADC

DX-Wire - German internet shop for difficult-to-find components, which are used by radio amateurs. Antenna parts, masts and mounts, cables connectors, wires, rf-chockes, toroids cores, twin-lead, teflon -strand, insultators

Mi3nie - HF wire antennas toroids, connectors and accessories, online shop

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

LCLAYOUT drawing software - Simple inexpensive program that allows L-C filters designed by PCFILT or S/FILSYN which are to be built using air wound inductors and single layer capacitors cut from alumina or duroid substrate materials

LA6PB's split dipole - A new method of feeding a dipole with toroids.

Toroid data - Information on toroids, binocular cores, iron powders, ferrite

Inductor Design Software - RF toroid - A free too designed to assist in the selection of iron and alloy powder cores. RF toroid calculate the location of the Self resonate frequencies for series and shunt inductors.

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