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VK5ZVS |
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Projects 'n' Stuff |
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4 to 1 balun. |
This balun was made with two ferrite cores,
(Jaycar LF1258)wired using Cat 5 UTP wire. The winding ratio is 6 turns to 12 turns.
50 ohm primary is 6 turns. The 200 ohm secondary is formed by adding 3 turns to either end,
giving 12 turns overall. The picture here shows the balun core ready for testing. The two single
wires are the 200 ohm secondary. The two inner soldered pairs are the 50 ohm primary.
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Here's the Smith chart showing the impedance from 1 to 50MHz.
The marker is at 30MHz.
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Here's the VSWR from 1 to 50MHz.
The marker is at 30MHz.
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Here you can see the balun in the box.
What you can't see is the glue on the other side of the balun providing
additional support between the balun and the case.
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Giving your project a printed label gives it a more
professional look and finish!
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