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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.
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.
Reviews For: Palomar Engineers 49:1 Unun Category: Antenna parts, accessories, incl. baluns, hardware, etc.
This is a followup video to #344 where I assembled the 49:1 UNUN kit from HF-Kits / ARRL. Here I show finalizing the antenna, getting it in the air, and run...
26 sty 2014 · Folks, I built a couple of 49:1 unun transformers attached to a 130' wire. Amazing of how well this works. Primary has 2 bifilar turns, and secondary is total of 14 turns. Some great references out there such as https://elginradio.wordpress.com/2017/10/17/end-fed-half-wave-antennas/.
29 mar 2022 · The coil can be configured as a a 49:1 Unun, 9:1 Unun, or 1:1 Balun. If you choose the EFHW route you will need to solder one surface-mount capacitor on the board. If you’ve never worked with surface mount components before, take your time and use a good magnifying glass.
EFHW | Experimental Multiband Antenna with 49:1 UnUn. I made my first multiband experimental version of the Multiband EFHW antenna with 49:1 UnUn transformer. In this first part I want to show you complete process of made this antenna.
