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  CIMG1940.JPG - Commercial 4 port combiners are expensive. They usually cover 100s to 1000s of MHz. Here is my first attempt with no optimization.  Each transformer has 4 turns. 1:1.0 SWR all ports. Loss   30db.  Balance, 0.005db and 0.3 degrees.  Excellent!  
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Commercial 4 port combiners are expensive. They usually cover 100s to 1000s of MHz. Here is my first attempt with no optimization. Each transformer has 4 turns. 1:1.0 SWR all ports. Loss < 0.125db over ideal (6db). Port to port isolation > 30db. Balance, 0.005db and 0.3 degrees. Excellent! Download
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