WebThe antenna is most suitable for short range NVIS contacts. On 40 meters the antenna radiates as two half-waves. Gain drops by 2/3 from 6.12 dBi at 40 feet down to 2.13 dBi when sloping (Signal points up at 25° away … WebAug 12, 2016 · End-fed wire antennas are a different beast. They are not a half-wavelength long, meaning that, if you choose the length of the radiator wisely, the impedance at the end of the wire will not be as high as the impedance of a half wavelength long wire. In many cases, the impedance can be transformed with the help of a 9:1 unun (unbalanced input ...
EFHW on same mast as a vertical antenna? : …
WebJan 19, 2024 · The Antenna Tuner will load an End Fed Long Wire effectively, especially if it is cut to aprox. an Odd Quarter Wave-Length of your target band... 186 ft / 16.5 ft and 186 ft / 33 ft... The entire antenna … WebAug 17, 2024 · 20m End Fed Half Wave (EFHW) Build. I recently acquired an intertest in Slow Scan TV (SSTV) and one of the most popular frequencies for SSTV exchanges is 14.230 MHz. My 270 foot Off-Center Fed Multiband has a Standing Wave Ratio (SWR) of 3:1 on 14.230 MHz before tuning so I was looking for better efficiency. Here is a great … holidays in mainland greece
Simple EFHW vertical on 20m works great! – M0AWS Amateur Radio
WebJan 24, 2024 · 3. No, it is not needed, but it can improve the antenna system. An EFHW is simply a half-wave length of wire and a matching device, and that's it. Counterpoises are commonly added to shunt common mode reflections when operating outside of the wire's resonant frequency to avoid RFI issues ("RF in the shack"). WebSuccess! Full length for 40 meters it stands 6 feet tall atop its 8" spike made from 1/4 inch aluminum hardware store rod stock. When collapsed and disassembled the longest piece is 10" collapsed whip. for counterpoise I … WebSep 18, 2024 · The vertical “J-Pole” EFHW does get your VHF/UHF HT into the mid-range repeaters better than that Rubber Dummy Load antenna however. Where does the signal go? An ideal half wavelength wire in free space will radiate in the classic 3-D “Donut” pattern regardless of where it’s fed along its length; end, center, off center etc. hulu fire island trailer