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Reviews For: Palomar Engineers 49:1 Unun Category: Antenna parts, accessories, incl. baluns, hardware, etc.
26 sty 2014 · 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/.
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.
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.
The "9:1 UNUN" are for random length wire antennas fed at the end. 49:1 or other high ratio transformers are for resonant "cut to frequency" antennas like the traditional zepp/fuchs antenna.
10 sty 2024 · This is a great antenna that works superbly on the 30m band. Being a resonant half wave fed via a 49:1 Unun it doesn’t require any ATU inline normally and so it’s quick and easy to use with any radio. Today I decided to disconnect and remove the 49:1 Unun and hook up the Icom AH-705 instead.
I recently replaced the 20W-rated 49:1 unun for my EFHW with a new 200W-rated 49:1 unit, and the new SWR graph is completely different. Does this mean there’s a problem somewhere, or why is it so different?
