1:49 Transformer for EFHW Dipole Antenna
By OK1GHZThe article describes the construction of a 1:49 impedance transformer designed to match the high impedance (around 2500Ω) of an end-fed half-wave (EFHW) dipole antenna to the 50Ω impedance of a typical transceiver. The EFHW is a popular portable antenna due to its simple construction, but feeding it can be challenging compared to a center-fed dipole. The transformer was built using an FT240-43 ferrite toroid core, with 2 primary and 14 secondary windings for a 1:49 impedance ratio. A capacitor was added in series with the primary winding to improve performance at higher frequencies. The author compared versions with one and two cores, and found that 100pF worked best for the single core design while 200pF was optimal for the dual core transformer.
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You will find this resource in just one category on our links directory. The title of the main category is End Fed Half Wave Antenna and it deals mainly with EFHW End Fed Halfwave Antenna. The resource has been on our site since Saturday Sep 7 2024, and it has been viewed 86 times. So far no one has rated it yet. Be the first to rate it!Rate this resource
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