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4:1 Balun	Reply
by AD6JN on February 21, 2006	Mail this to a friend!
I need to make a balun to match 50 ohms to 12.5 ohms. The frequency is in the 2 meter band. I have worked with HF toroid type baluns and familar with coax type baluns. I need to make 2 baluns for a one time experiment. I need some help with this...and ideas or directions. Thank you in advance. Bob AD6JN

RE: 4:1 Balun	Reply
by WB2WIK on February 21, 2006	Mail this to a friend!
How much power does it have to handle?

RE: 4:1 Balun	Reply
by K5DVW on February 21, 2006	Mail this to a friend!
Which impedance is unbalanced and which is balanced? Does the balanced side need to be ground referenced (like a ceter tapped transformer)? Do you really need a balun or can you use a straight impedance transformation? Maybe a little more about what you're trying to do would be helpful?

RE: 4:1 Balun	Reply
by WB6BYU on February 22, 2006	Mail this to a friend!
A very simple way to do it is explained here: http://www.dk7zb.fox28.de/start1.htm (click on "The DZ7ZB-Match" near the top on the left side.) Basically you use two quarter-wave sections of 50 ohm coax in parallel to make a 25 ohm line (to provide the impedance transformation), then coil the coax into a choke to perform the balun function.

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