load coil calculator

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

160 meter linear loaded Inverted L antenna - The total length of the inverted L is 240 feet, which is 7/16th of a wave length long. It has a 92 foot horizontal linear load section 1 foot above ground that terminates into a home-brewed parallel network tuner by KN4LF

An antenna for 7MHz local contacts - This article describes the design of an antenna for local contacts on 7MHz, including a simple and efficient matching system that presents a 50 ohm load to the transceiver.

Antenna Trap Calculator - Design your own antenna trap online

Coil calculator - On-line single-layer coil designer

Antenna wire catenary calculator - This is a simple calculator for solving the antenna wire catenary between to end points given the design wind speed, mass per unit length of the wire, wire diameter and Gross Breaking Strength of the wire.

Balun Construction - Construction and use of broadband transformers

Build Your Own Coils - A method of building coils for your home made antennas

Home Brew Loading Coil for AD5X Vertical - How to make a loading coil for the AD5X portable vertical antenna

Building Coils - Building coils for a portable dipole using a novel method of winding coils with weedeater cord! By K4MMG

Easy tuning an building of traps  ^updated - A new and simple method for tuning traps. You need 2-3Watt of your TRX and two homemade coupling coils by DK7ZB

QRP Antenna 80-40-20-15 End Fed Antenna - A long wire antenna that will load up on 80, 40, 20 & 15 meters without an antenna tuner and without balun coils

Analysis Of Antenna Mast Strength and Bending Stress - Calculations for determining the wind loading stress on an antenna mast. Link to a spreadsheet for calculating the mast bending stress based on wind speed and antenna cross sectional area.

Single Coil Z Match - The simple Z match tuner simplified, article by Lloyd Butler VK5BR

D-Star Query - DStarQuery was written to provide a universal query mechanism for Icom D-STAR enabled radios with a low speed port.

D-STAR Callsign Calculator - This is a user-friendly web page based D-STAR call sign calculator that requires no installation or configuration to use.

Technical books online - Downloadable Amateur Radio Tube related technical books free of charge and ready to download.

Yaesu FTDX-5000MP QST Review - QST review of the Yaesu FTDX-5000 provided by IV3VNY

Ridge Equipment - Sells a broad range of Electronic Test Equipment as well as a full line of Cables, Connectors, Loads and Accessories for commercial or amateur antenna installation and repair.

Master.dta Editor - Freeware windows program by WE3NEA that allow to view and edit the Master Callsign Database file used in many contesting programs, import and export callsigns, auto-download announced DX operations.

D-PRS Interface - D-PRS Interface is written to provide a universal interface between APRS clients and an Icom D-STAR enabled radio with a low speed port.

W2IOL GCGC Distance/Bearing - Freeware dos and linux command line executables to calculate grid great circle/geodesic distance, azimuth/bearing and MUF calculator by W2IOL

mini dB Calculator - dB-Calculation for the experimenting radio amateur.

Ohm's Law for Dummy Loads - If you need a dummy load and don't want to spend money for it, you should read this article

Two PIC-Based Keyers - By Andy Palm N1KSN