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Online Toroid Calculator


Optimum Resonant Circuit Range, Turns-Length Calculator
post 17 Mar 2024
Online Toroid Calculator

Toroid & balun Links

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4:1 Current Balun using Ferrite rods
Guanella 4:1 Current Balun using Ferrite rods most articles on building the Guanella 4:1 Current balun use one or two toroids. For the range 1.8 MHz to 28 MHz

Zip Cord Transmission Lines and Baluns
A commercially available 4:1 voltage balun, was originally used for the transition between the 50 ohm coaxial cable and the balanced speaker wire transmission line

Calculating a choke balun
When the decision is made to put a balun type filter shoke choke balun, there is more to decide which coaxial cable to use; which diameter to give to the winding, and how many turns to put there

A Cost Effective Current-Mode 1:4 Balun
A cost effective current-mode 1:4 balun can be constructed from two lengths of coax, two ferrite rods


Take off angle of horizontal antenna

Take off angle of horizontal antenna For horizontal polarization, the electric field will move sideways on a horizontal plane, while for vertical polarization it will oscillate up and down on a vertical plane

A remote antenna switch

A remote antenna switch An abiding dislike for bundles of cables running on the exterior of my house, so a remote antenna switch seemed like a good idea

5 element yagi antenna for 28.5 Mhz

5 element yagi antenna for 28.5 Mhz Gamma match will be made with a 1/2 "aluminum tube and a 75 cm coaxial piece of RG8 without sock and sheath inside the tube