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This project assembles a 49:1 ferrite-core (“FT”) type #43 transformer that matches 50 ohm input to 2500 ohm end fed antenna. It is optimized for 3.5/7/10/14 MHz but will work reasonably well on all
14 lut 2022 · The 49:1 Unun Impedance Transformer secured in electrical junction box with all proper connections assembled. 100pF 15kVDC capacitor soldered at center conductor of SO239 connector and twisted ground wires.
The 49:1 impedance transformer ( or 64:1 ) will help you bring down the high impedance of your resonant EFHW antenna to almost 50 Ohm. Let’s have a look at a few details on how to build a 49:1, or a 64:1 impedance transformer.
8) Prepare the 49:1 Transformer Casing 1)About 1” to the left of the eye bolt, drill a 5/32” hole for a #8 machine screw. 2)About 1.5” to the left of the bottom center (where the SO-239 and the zip tie holes are), drill a 5/32” hole for a #8 machine screw. 3)Do not install the #8 machine screws yet.
The heart and engineering of its design is in its 49:1 impedance matching transformer, or unun (connects an unbalanced feed line to an unbalanced radiating element,) where much of this DIY is focused. The 132-foot half-wave radiating element presents about an 1800 ohm (at 10 meters) to 5000 ohm (at 80 meters) impedance to an end-fed feed point.
4 sie 2020 · This is the page on the End-Fed Half-Wave antenna with a 49:1 transformer. This is a multiband antenna without the need for any tuner (which is the best type of antenna). With the blessing of Steve Ellington and his presentation of this antenna I am translating everything into text for easy searching and reference for others.
In this article I will cover several topics given that the subject is about building an Antenna System and not just the antenna. There are four specific areas we will dive into, the first is the antenna, the second baluns, the third chokes, and lastly the transmission line.
