![]() ![]() Fair-Rite’s Type 75 material is quite similar to Steward’s 35 and may be used if desired.ĭX Engineering’s Color-Coded Ferrite Toroids It has a relative permeability at low frequencies of 5000, compared with 800 for Fair-Rite’s 43 material, and it’s available in small quantities from DigiKey. ![]() ![]() I’ve used Fair-Rite 43 material toroid cores in the past, but where low frequency performance is necessary, I’ve found Steward’s 35 material useful. 26 AWG wires twisted together around 4 to 5 turns per inch, wound with 10 turns on a Steward 35T0501-H10 ferrite core. My favorite design uses a bifilar winding, consisting of two no. I’ve wound many of these and written an article for 73 Magazine about the subject as well, but there’s always interest in broadband transformers. ![]() In working on an active antenna and preamplifier design, I needed a broadband 1:1 transformer. (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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