Hi All
i tryed to change the balun designe with the same FT140-43 but with 1X12 turns this time , I measure the charateristic impedance of the balun is around 142 Ohm ( see Smith shart focused on the graph center) , but this time with 78.5 Ohm renormalized coax impedance it gives the half with 50 Ohm normal coax , huge diffrence around 1db at 30Mhz , in add this new balun seems have much more losses -2.5 db compared to the first one -0.2db , why ?? what is not correct with this second balun , see illustration below .
73's Nizar .
