I use the VK6YSF pages to build my baluns. The instructions are clear and cover all
the parts and building instructions, and the materials are readily available in
Australia.
1:1 Choking balun Choking balun for lower HF and MF bands. (1.8MHz - 10MHz) T250-26 Powdered Iron Toroid Core..
1:1 Guanella current balun 1:1 Guanella current balun (1.8 - 30MHz) L15 ferrite toroid core.
1:4 Guanella current balun 1:4 Guanella current balun (1.8 - 30MHz) L15 ferrite toroid core.
1:1 Ruthroff voltage balun, 1:1 Ruthroff voltage balun (1.8 - 30MHz) T-200-2 powdered iron toroid core.
4:1 Ruthroff voltage balun 4:1 Ruthroff voltage balun (1.8 - 30MHz) T-200-2 powdered iron toroid core.
6:1 Ruthroff voltage balun 6:1 Ruthroff voltage balun (1.8 - 30MHz) L15 ferrite toroid core.
1:9 voltage unun_v1 9:1 voltage unun (1.8 - 30MHz) T-200-2 powdered iron toroid core. Version 1
1:9 voltage unun_v2 9:1 voltage unun (1.8 - 30MHz) L15 ferrite toroid core. Version 2
9:1 Voltage Balun
Also see Martin Ehrenfried G8JNJ 2007 to 2019 - A disscussion on problem of providing a balanced feed from an un-balanced atu.
Martin Ehrenfried G8JNJ 2007 to 2019
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