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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 amateur bands from 80 meters thru 10 meters with a 135 foot length of wire and a short connection to ground.
For it's simplicity and small dimensions is very popular for portable or SOTA activities, and also as a static-mobile antenna. This Mini 49:1 UnUn can be used also as the base point of a vertical dipole antenna with its half wave length. MULTIBAND ANTENNA.
20 lip 2024 · W skład zestawu wchodzi:Balun UnUn 49:1 na pasma KF transformator antenowy o mocy max. 500W SSB dedykowany do anten o impedancji 2540 Ohm np.
22 lut 2021 · The following is a list of materials required to make a 49:1 unun impedance transformer for an end-fed half wave antenna. You will also need a half-wavelength length of wire (14 or 12 gauge typically) in order to construct an antenna radiator for whichever ham band you choose.
An 80-10 end-fed half-wave antenna can be a very good performing part of an HF station. But its performance depends heavily on a well-designed and carefully constructed 49:1 unun, which matches the long wire impedance to within tuning range of operation. But the perfor-mance of an end-fed antenna is also very dependent on height above ground.
Our EFHW 49:1 Antenna Kit is perfect for radio enthusiasts looking to build their own end-fed half-wave (EFHW) antenna. The kit includes a high-quality 49:1 transformer 50 meters of wire and an accessory pack, giving you everything you need to set up the antenna out of the box.
Capable of handling 1kW PEP / 250W AM, Data, FT8, FT4 etc. For SWR greater than 1.2, reduce TX power accordingly. Multi-Band Functionality. Works on multiple frequencies; half-wave for 80m (~132 feet) translates to multiple half-waves on higher bands.
