(In ham radio nomenclature, the core is an FT37-43.) 6 bifilar wound turns on a Fair-Rite 5943000201 core. (In ham radio nomenclature, the core is a BN-43-202.) The 1 turn wining is made from two lengths of 1/8″ rigid copper tubing with end plates from scrap pieces of printed circuit board material. The three transformers are, from left to right: These transformers are of the type used in input matching (50 ohms to lower impedance of the base circuit) and in the collector circuit (lower impedance to 50 ohm output). In working on a 10 watt high frequency 2SC1945 bipolar transistor amplifier, I built and evaluated three ferrite core transformers. (Editor’s Note: The following article is from the archives of experimenter, inventor, friend of the Ham Radio community, and founder of Clifton Laboratories, Jack Smith, K8ZOA (SK).
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