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DIY 300 to 75 Ohm TV Antenna Coaxial Baluns
Was Googling around for baluns and found your Instructable. You may want to double check the transformer schematic. On the 300 ohm side where the two windings #2 & #3 connect, I think that net should float, not connect back to the 75 ohm ground. As it is shown currently, winding #2 is shorted.
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