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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 →
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
A 9:1 Balun For Your End Fed Antenna
End-Fed antenna it is wired as a so-called unun transformer unbalanced to unbalanced
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, OE7OPJ
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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To best use a long-wire antenna, the 9: 1 transformer toroid T200-2 red or T200-6 yellow
End-Fed antenna it is wired as a so-called unun transformer unbalanced to unbalanced
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
23cm Yagi Antenna building Finished antenna at 1275 MHz SWR under 1:1.5 at resonant frequency
50 MHz preamp Gain 26dB with the BFG135 Preamps for 144 and 430 MHz, for 50 MHz, the BFG135a is a cheap transistor and in my view rather strong. It is not easily damaged by static discharge or RF power. FG connection
30 Volt Computer Power Supply Stack A bonus was that i discovered that these did not need a standby load connected to the supply to keep them running just apply mains power and close the Start lead to ground