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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
210
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
40m Compact 4-Square Antenna Compact 4-Square Antenna – EA5AVL The EA5AVL 40M Compact 4-Square Antenna was designed to provide excellent DX communications on the 40m band
The K9AY loop antenna for 160 and 80m bands You don't have the space to put up a 4 beverage antenna's, an ewe or a 4-square and want 'good ears' on 160 and 80m? no problems try a k9ay loop antenna
Spiderbeam 10-15-20m E' una Yagi tribanda full-size leggera, fatta di tubi in vetroresina e filo