coil

Easy wire antenna for 40-20-10 meters - PE3HMP project of a triband wire antenna for 40 20 10 meters band, made using home made coils

40/80 Coil loaded dipole - A coil loaded dipole antenna for 40 and 80 meters band by I2CN

8el 50Mhz / 70Mhz Dualband Yagi - Only just over 6 foot long, a compact 8 element dualband Yagi for 6 and 4 meters band. No traps or coils, no matching required. Simple to build by G0KSC

Dual Band Yagi 28Mhz and 50Mhz Priority listing - NO Traps or coils, NO matching required. Direct 50 Ohm feed. Easy to build and nothing else like it! Enjoy 50/28 with one feedline to a dual band high gain Yagi by G0KSC

PY1UNU dipole for 80 meters - A dipole with coils for 80 meters band in portuguese.

Antenna Loading Coil Calculation  ^updated - The calculation refers to either a loaded 1/4 wave or a loaded dipole,

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

Coiled Choke Balun for HF - A very practical Balun for HF aerial work is the choke type. It reduces RFI to and from the feeder & at next to no cost or loss.

Inductor operation - Understanding current in loading coils

Homebrewing Coils - Homebrewing antennas, homebrewing your own Coils ny K0BG

Antenna Matching Coil Adjustment Procedure - Without this basic knowledge, addressing antenna problems, RFI problems, and matching problems, results in a frustrating situation. Procedure which must be followed to properly adjust a shunt matching coil.

Inverted V - Described is a simple inverted-V antenna which, when used with a balanced ATU, can be used on all the main Radio Amateur HF bands (80, 40, 20, 15 and 10m). The cental support is made in such a way that the wire can be coiled up for storage when the antenna is taken down.

3MA triband mobile antenna - 3 band mobile antenna - 10m full size wave/4 whip - quick tilt-down system for 20 and 15 m loading coil change by IZ7DJR

Do it yourself HF2V - HF2V dimensions for all the coils and capacitors. Make your own HF2V antenna with 160 80 40 and 30 meters kits by OZ9AEC

Base Loaded 160M Half-Sloper Antenna - K0EMT 160 meters sloper antenna

Antenna Efficiency - K0BG article con antenna efficiency covering topics like radiation resistance, coil losses and ground losses, other kind of losses. How calculate efficiency and Bandwidth Notes

CWS Coil Winding Specialist - Manufacturer of transformers, inductors coils and chokes. Custom winding, EMI / RFI Filters, Antenna Windings on ferrite rod, Antenna Winding on phenolic. Any antenna coil designs.

C&M Corporation - C&M Corporation is a leading manufacturer for custom cable, cable assemblies and coil cord.

BG Micro - All kind of electronic components, Hobby Electronics and Parts, motors, Sun power solar panels, switches, rechargeable batteries, RF Coils, Coils and Chokes

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

Helicoil - Noble Enterprises, Heli-coil Helicoil, Helicoil Insert, Helicoil Inserts, Inserts, Cutting Tools, Thread Cutting Tap, Thread Cutting Tools, Machine Tap,

Coil Inductance Calculator - Approximate Air Coil Inductance Calculator

Increasing Amplifier Relay Speed - Article describes a circuit that accelerates the coil of DC relays by momentarily doubling their voltage.

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