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4 to 1 balun. |
This balun was made with single ferrite core,
(Jaycar L01234) wired using single strand Cat 5 UTP wire. The winding ratio is 7 turns to 14 turns.
50 ohm primary is 4 x 7 turns, wired in parallel. The 200 ohm secondary is formed by winding 2 x 7 turns in series,
(grounding the centre tap) giving 14 turns overall. This gives a truely unbalanced to balanced (balun) impedance transformer.
The picture here shows the finished balun core ready for testing. The two single wires are the 200 ohm secondary. The others
are the 50 ohm primary with the larger one being the common ground.
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