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Balun & binocular for Delta, Flag, and SuperLoop


Winding your own RF matching/isolation transformers for broadband loop antennas is super easy, especially if a binocular ferrite core is used
post 16 Dec 2021


Toroid & balun Links

213



Un balun de courant 1:1 sur tore ferrite
The two-wire line consisting of two enamelled son twisted together is wound on a torus of sufficient size to limit losses and prevent overheating of the core. 8 to 12 turns of enamelled wire 15 / 10mm wound on a ferrite core of diameter 50mm suitable for powers of the order of 100 W

Un balun de tension 1:1 sur tore ferrite
The three chokes are wound together on the same ferrite core and strongly coupled to each other since the three wires have been twisted to form a three-wire line

The Ugly Beehive Choke
What attracted me to this was the lower insertion/heating loss versus other types of baluns/chokes. I chose a design that would work for 20-10m and essentially that was a 9 Turns of RG-8X on a 3.25 Dia tube

Choke Balun experiment
I was aware from some early experiments on cores FT240-30 windings would have high resistances as well as fairly high inductive reactance

Vari balun Balun 1:1 - 1:4 - 1:9
Baluns BALanced to UNbalanced are still a mystery for hams; the only way to understand this is to learn what it is and how to use it

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