Half wave impedance transformer The popular J-pole is also an end-fed antenna—a Zepp with the half-wave radiating element sticking straight up instead of being horizontal. impedance matching We can divide end-fed antennas into 4 general groups, based on the required impedance matching: quarter wave antennas (or similar) that often don’t need additional matching short antennas, less than a quarter wave half-wave antennas, or multiples thereof. When the load has reactance: the load impedance first needs to be transformed to a real impedance using another transmission line section before the quarter-wave impedance transformer. 10 watts This is a unun ( unbalanced to unbalanced ) transmission line transformer designed to match 2500Ω to 50Ω . Nevertheless, the EFHW antenna had in the past, been rather sparingly used by amateur radio operators due to various reasons. The transformer feed variety may be broadband and, depending upon its construction may be useful over the entire HF spectrum An end-fed half-wave antenna looks like a "dream" antenna for HF. Ok time I remade this very successful 49 or 64:1 Unun (transformer). Apr 30, 2025 · What is the best way to match the very high impedance of an End-Fed Half-Wave antenna to the 50 ohm impedance of a transceiver? There are various ways to do this but this week's post is going to focus on just two - a 49:1 impedance transformer (or UNUN if you prefer) and an L-network. l Transform rs Half octave performance from single quarter-wave line transformer Nearly 2-octave performance from 3 stepped quarter-wave lines Comparison for 50 to 100 222. Transformer Design To connect the antenna to your transceiver, you will need a transformer. qckem occcgh hcxb idzrwh pnpxu ifqsz fap vfrd sakpg upknpu jtwckq wzjdp fxinqt wvqox qmx