toroid wound

A Practical Antenna for 160 Metres  ^pop - 140 feet of insulated wire, the first half of which (70 feet) is space wound on an insulated tube.

The 160M Homebrew Vertical - The 160M "No Excuses" Homebrew Vertical is a 27 ft. vertical antenna, made from three 10 ft. PVC sections bolted together, and half wavelength of antenna wire helically wound around the PVC sections by K6MM

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

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

Long Loopstick Antenna - Wound on a 3 foot length of PVC pipe, the long loopstick antenna was an experiment to try to improve AM radio reception without using a long wire or ground.

CoaxTrap - This program let you design of antenna trap using length of coaxial line wound as solenoid on a coil former.

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

How to wind a choke - How to build and properly wound an efficient RF choke to protect antenna controller in mobile setups

Electronic Goldmine - Electronic components dealer, semiconductors, switches, leds, motors, solar energy, ferrites, toroids, capacitors, batteries, jacks and plugs, microphones, meters, power supplies, speakers, transformers, wire and more

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

HeliCoil - Inductance calculation for single layer, air-wounded coils and helixes up to about 800 MHz. Inductance calculations accuracy is around 1%. Also, coils with maximum Q for given inductance, resonant RF chokes, PI and T resistive attenuators calculations are provided. Skin effects, radiation losses and other minor side effects are not accounted in maksimum Q factor coils calculations. Program assumes using copper (Cu) enameled or silver (Ag) plated wire. Program is writen bilingual in English and Serbian by YU1AW

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

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

Online Calculators for Radio & Electronic Design - Online calculators for toroid coil, air-core coil inductance, XL, XC, and more.

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

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

Toroid Winding Calculator  ^updated - Choose Iron Powder or Ferrite and calculate required turns

Toroid cross reference - Construction articles in magazines and books often use part numbers of firms no longer in business or whose parts are hard to find. Here you can locate the palomar toroids equivalent

A 80/40m DDS controlled QRP CW transmitter - JUMA-TX1 is a 5W CW transmitter for the 80/40m bands. Juha (OH2NLT) and Matti (OH7SV) have had high quality CW keying and a compact size as design goals for this project. No coils need to be wound to construct this transmitter!

Toroid Pro - Designed by microwave engineers to provide filter, radio,microwave and Ham radio engineers with all relevant information of an inductor and core at his or her finger tips

A 80/40m Direct Conversion HF Receiver with DDS VFO - Juha (OH2NLT) and Matti (OH7SV) have designed JUMA-RX1, an award winning 80/40m direct conversion HF receiver with highly accurate direct digital synthesis VFO. The receiver is very compact, because it constructed using surface mount components. No coils need to be wound to construct this receiver!