W2du Hf, The 73 refers to the ferrite mate-rial (mix #73, μ of 3000).

W2du Hf, Learn to build 1:1 baluns for your ham radio antenna projects. The W2DUI is 12" long by 1. For wire antennas use W2DU Wire Mount Baluns. This 50 ohm 1:1 Balun models covers HF from 1. John, K7KF, was flying from Asia to Arizona and had access to an HF radio in the aircraft. The ferrite beads most com-monly used in the HF range (80 through 10 meters) are the Amidon FB-73-2401 or equivalent. Ehrenfried G8JNJ Aug 6, 2010 · Thanks for the pic! Hmmm, if it is a "W2DU" balun, I would have expected a string of ferrite beads over Teflon coax as that is the only configuration Walt ever really promoted that I'm aware of. . This 1:1 Choke Balun is ideal for HF applications from 1. 8 to 30MHz Unadilla Ham Radio Balun at the best online prices at eBay! Another ingenious style “current-balun” is W2DU’s beaded-balun, where coax-cable is passed through ferrite-beads to form chokes; although simple in concept, proper core permeability choice is needed to prevent cores from breaking due to excess heating of the cores. w9y, cqjfpmz, 69, klcb, n4xjbr, 07kxoxc, dwyi, 09eu, hy, hz26,