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4 to 1 balun. |
This balun was made with single ferrite core,
(Jaycar L01234) wired using 9 turns of three single strands of Cat 5 UTP wire in an auto-transformer type configuration.
50 ohm primary is made from 2 x 9 turns, wired in parallel. The 200 ohm secondary is formed from the remaining single 9 turn winding.
The picture here shows the completed balun core.
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