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Binocular ferrite 9:1 balun rx transformer
There are lots of good designs for matching transformers for receiving antennas. it's cheap and easy, and very high performance
post 28 Jan 2024
Toroid & balun Links →
Open Air Choke Balun
impedance long wire from a 50ohm unbalanced coaxial input. With a 9:1 turns ratio, this gives approx. 450ohm output impedance
Transformateur adaptation pour antenne 9:1 balun
To best use a long-wire antenna, the 9: 1 transformer toroid T200-2 red or T200-6 yellow
Portable Antennas EndFed
Antenna endfed portable 30ft of wire fed into a 9:1 unun
Balun 9:1 su toroide
Each antenna has a characteristic impedance that, often, does not fit with that of the drop cables and the inputs of the equipment
One balun for 40-80-160 meter
Amidon FT 140-77 for 40/80/160m, and amidon FT140-43 for 20-6m - multi trasformer 4:1 - 9:1 - 16:1
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impedance long wire from a 50ohm unbalanced coaxial input. With a 9:1 turns ratio, this gives approx. 450ohm output impedance
To best use a long-wire antenna, the 9: 1 transformer toroid T200-2 red or T200-6 yellow
Antenna endfed portable 30ft of wire fed into a 9:1 unun
Each antenna has a characteristic impedance that, often, does not fit with that of the drop cables and the inputs of the equipment
Amidon FT 140-77 for 40/80/160m, and amidon FT140-43 for 20-6m - multi trasformer 4:1 - 9:1 - 16:1
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
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
Calculo da Antena Bazooka A double bazooka antenna is a combination that has a complete coaxial wave multiplied by its velocity factor and a total end-to-end length of 1/4 wave for each side affected by another driver shortening facto