Tuesday, May 12, 2009

magnetic "balun"

Some weeks ago, I stumbled across the broadband aerials BB-6W and BB-7V made by Diamond. Further research resulted in so called "magnetic baluns". Well, the balun actually is a "6:1-UnUn" shunted by a heavy duty resistor.
My approach: Iron-powder toroid T200-2, 12 trifilar windings using power cord for a 9:1 UnUn, no shunt. In combination with about 7m of wire, this actually works. Well, it works, not really a pile-up breaker... For a five minutes project however, not a bad result.