[Amps] simple balun (101) questions

Dan Sawyer dansawyer at earthlink.net
Sat Mar 4 10:59:23 EST 2006


All,

This is a simple balun question. I wish to make a 100 watt 50 Ohm to 
about 25 Ohm balun for 2 to 50 MHz, I realize that spread may be too 
large and both ends may not perform well. The input is coax and the 
output is effectively a dipole.

What core material should I select? (I believe 43)

About what OD diameter core?

How many windings should be on the 50 Ohm side?

How many windings should be on the 25 Ohm side?

Should this be wound as independent windings or as an autotransformer?

I have tried to make a balun with 'red' cores with 10 windings on the 
input and 7 on the output. This does not behave well at all. There is 
some signal at the output however impedance measurements are very strange.

Thanks in advance - Dan


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