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| The 4 square needs two of its ports inverted (180 degrees). An additional transformer is added in one of the output transformer paths. Now those two outputs are 180 degrees out of phase. When placed after the input transformer the path loss increases 0.2db. When inserted befor the output xfmr the loss dropped to 0.1db. This design uses 6 cores. BTW the cores are about 25 cents a piece (9/2011). | |
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