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post 17 Mar 2024
Toroid & balun Links →
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
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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
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
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 can be constructed from two lengths of coax, two ferrite rods
Linear loaded short dipole 21Mhz For my amateur radio activities on the HF bands I only have a 3.6 m wide balcony available for antennas. After some study I decided to experiment with a shortened dipole for the 15 m band
Rx antennas 4Square Rx Vertical Array My frequency design of 1.825 MHz a 90 degrees line would be 33,70 metersinstead of the previously calculated 33,27 m
Atu balanced feeder antenna system An ATU has the advantage of bringing the feeder-antenna system to resonance, act as a band pass filter both on receive and transmit and a low SWR