Unique 2.5KW QRO 491 EFHW Antenna Unun/Balun/Transformer

High-efficiency / High power 49:1 transformer for EndFed Half Wave (EFHW) antenna. Up to 2,5KW SSB. From 40 up to 10m (usable on 80m too). Classical 49:1 baluns/transformers are based on FTxxx-43, with wide spaced windings, and a crossover. But do you know that such design has a poor efficiency, down to 66% and up to 80% max only?

Don't you want your RF power to be really radiated, without excessive heating, limiting your output power? ==> Get the most efficient "QRO" 49:1 solution with this unbeatable product! Efficiency measured > 90% from 40 up to 10m (up to 98%).

2,5KW SSB rated from 40 up to 15m. 1KW SSB rated on 10m.

Close-wound windings + autotransformer (14/2 turns ratio). Genuine 3x FT240-61 toroids from Fair-rite + 3x47pF capacitor from TDK (6Kv rated each) ==> unique design on the market! 2mm dual coated enameled wire.

11,5x9cm waterproof ABS box, with 4 pre-drilled holes for easy mounting (mast, wall, etc). Stainless steel eyebolt for strain relief. Input = PTFE SO239 connector. Output = M6 stainless steel A4-grade screw with wing-nut and ceramic insulator.

Be sure of what you get, this is made in France, by a ham, for hams!

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