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1:4 Guanella Balun Current Balun
The purpose of this article is to show how a 1:4 Guanella current-balun changes an impedance level by a multiplier of four; for example, 50 ohm coax to a 200 ohm antenna
post 27 Feb 2024
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A Simple Clamp-On Current Transformer
After the core was cut I wrapped a layer of electrical tape around the core as shown in figure 3. The next step was to cut a strip of copper
Homemade ferrite core baluns
I became interested in baluns when I had to choose one for my OCFD antenna. Generally 1:6 baluns are recommended for OCFD's as the nominal impedance at the 1/3-2/3 feed point is about 300 ohms
Balun sur air
It's a question of doing as well as a manufactured product and getting an education the equipment is reduced to a dummy load of 50ohms and the analyzer MFJ-259
Construction de Baluns
The transformer uses two ferrite tubes, material "43" or "61", or other material with permeability between 125 and 850.
End-fed wire antennas with 9.1 balun
The balun trasnsform the very high impedance at the end of a half-wave wire to about 50 Ω
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After the core was cut I wrapped a layer of electrical tape around the core as shown in figure 3. The next step was to cut a strip of copper
I became interested in baluns when I had to choose one for my OCFD antenna. Generally 1:6 baluns are recommended for OCFD's as the nominal impedance at the 1/3-2/3 feed point is about 300 ohms
It's a question of doing as well as a manufactured product and getting an education the equipment is reduced to a dummy load of 50ohms and the analyzer MFJ-259
The transformer uses two ferrite tubes, material "43" or "61", or other material with permeability between 125 and 850.
The balun trasnsform the very high impedance at the end of a half-wave wire to about 50 Ω
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
A simple SWR Meter is to be used at HF An SWR meter provides information about how well matched is your antenna with the transmitter and how well power is being radiated