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The physical length of any HF antenna is critical to achieving resonance and good performance on a particular band. Dipoles need to be half a wavelength long, locating these long antennas can be an issue, especially when we are aiming for the 80 metre band or lower.
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80 metre end-fed antenna; 40m Hamstick Dipole vs 1/4 wave...
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19 sty 2017 · I want to use an end-fed wire antenna, but what would be the best length of wire for the 20m and 40m bands? Is there a way to work this out? This is assuming a tuner will be used.
6 lis 2024 · 80 TO 6 METERS END-FED ANTENNA. The ULTIMAX 100 antenna is designed with the H.O.A., limited space amateur, and rapid deployment operator in mind. It provides for all-band operation from 80 to 6 meters continuously with just the use of an antenna tuner and no radials or grounding needed.
2.1. Antenna length based on the following formulars: 1/2 λ dipole (feet)= 468 / frequency in Mhz. 1/2 λ dipole (meters) = 142.65 / frequency in Mhz. Full wave loop (feet) = 1005 / frequency in Mhz. Full wave loop (meters) = 306.32 / frequency in Mhz. Cut wire slightly longer for connecting insulators and pruning. 22-Jun-2007 09:30 AM.
The impedance of a end fed wire can be anywhere from a few 10s of Ohms to a few thousand Ohms, depending on the frequency in use and the length of the wire. Other factors that can affect the impedance are bends in the wire, height above ground, proximity to buildings and wire diameter.
14 sie 2024 · The following steps outline how to calculate the length of an Efhw Antenna using the formula: L = 468 / f. First, determine the frequency (f) in MHz. Next, use the formula L = 468 / f to calculate the length of the antenna (L) in feet.
22 mar 2023 · A couple of years ago, I put up the 80 meter skyloop antenna (better known as a sky wire antenna) in the yard. Since then, no other antenna has worked so well for HF, than the 80 meter skyloop. Not even my 80 meter half wave end fed antenna! The skyloops performance does have a high price.
